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Sling 4 HW Pilot Operating Handbook

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DATE: 28 JANUARY 2025
SLING AIRCRAFT | HANGAR 8 | TEDDERFIELD AIRPARK | JHB SOUTH | EIKENHOF | 1872 | SOUTH AFRICA
Phone: +27 11 948 9898 | Information: technical@slingaircraft.com
DC-POH-001-X-G-2.0
DC-POH-001-X-G-2.0
PILOT OPERATING HANDBOOK
PILOT OPERATING HANDBOOK
PO BOX 308 | EIKENHOF | 1872 | SOUTH AFRICA
SERIAL NO :
REGISTRATION :
REVISION 2.0

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  • Page 1 DATE: 28 JANUARY 2025 REVISION 2.0 SLING AIRCRAFT | HANGAR 8 | TEDDERFIELD AIRPARK | JHB SOUTH | EIKENHOF | 1872 | SOUTH AFRICA PO BOX 308 | EIKENHOF | 1872 | SOUTH AFRICA Phone: +27 11 948 9898 | Information: technical@slingaircraft.com...
  • Page 2 ………………………………. Issue Date of POH: 2025/01/28 Please advise Sling Aircraft upon change of ownership of this aircraft. This airplane must be operated in compliance with information and limitations contained herein. This pilot operating handbook must be available on board the airplane at all times.
  • Page 3 Preface NOTICE This manual is written for the standard Rotax 915 iS or 916 iS powered Sling 4 High Wing, as manufactured on premises by Sling Aircraft (Pty) Ltd. Aircraft which differ from the production standard, in whatever way, are not addressed in this manual, except to the extent said aircraft corresponds with the production standard.

  • Page 4: Compliance Statement

    Pilot Operating Handbook Preface Compliance Statement The FAR Standards used for the design, construction, testing and continued airworthiness for the Sling 4 High Wing (HW) are: • FAA FAR, Part 23 – Airworthiness Standards: Normal, Utility, Aerobatic and Commuter Category Aeroplanes...

  • Page 5: Owner/Operator Responsibilities

    Continued Operational Safety Monitoring Manufacturer Responsibilities: Sling Aircraft has a procedure in place to monitor the safety of the fleet and to alert pilots of any potential safety issues. The owner of a Light- Sport Aircraft is responsible for making sure they receive pertinent safety information and comply with bulletins.

  • Page 6: Record Of Revisions

    Sling 4 HW Section 0 Pilot Operating Handbook Preface Record of Revisions Any revisions to this Pilots Operating Handbook must be recorded in the following table and, where applicable, be endorsed by the responsible airworthiness authority. Revision numbers and dates appear at the foot of each page.
  • Page 7 Sling 4 HW Section 0 Pilot Operating Handbook Preface List of Manual Revisions Latest Latest Page Page Status Page Page Status Revision Revision Original Original Original Original Original Original Original 2-10 Original Original 2-11 Original Original 2-12 Original Original 2-13...
  • Page 8 Sling 4 HW Section 0 Pilot Operating Handbook Preface Latest Latest Page Page Status Page Page Status Revision Revision Original Revised Original Original Original Original Original Original Original Original Original Original 4-10 Original Revised 4-11 Revised Original 4-12 Original Original...
  • Page 9 Sling 4 HW Section 0 Pilot Operating Handbook Preface Latest Latest Page Page Status Page Page Status Revision Revision 7-34 Original 8-26 Added 7-35 Original 8-27 Added 7-36 Revised 8-28 Added 7-37 Revised 8-29 Revised 7-38 Original 8-30 Added 7-39...

  • Page 10: Table Of Contents

    Sling 4 HW Section 0 Pilot Operating Handbook Preface Table of Contents General Information ............... 1-0 Limitations ..................2-0 Emergency Procedures ..............3-0 Normal Procedures ................. 4-0 Performance ................... 5-0 Weight and Balance ................ 6-0 Aircraft and Systems ............... 7-0 Supplementary Information ............

  • Page 11: General Information

    Introduction to Airplane ............1-1 Warnings, Cautions and Notes ..........1-2 Aircraft 3-View Drawing ............1-3 Data for Sling 4 HW Aircraft and Systems ......... 1-5 Terminology, Symbols and Conversion Factors ...... 1-10 Supporting Documents ............1-15 Document Number: DC-POH-001-X-G-2.0 Page | 1-0 Revision: 2.0...

  • Page 12: Introduction To Airplane

    916 iS power plant, that outputs 160hp, combined with a MTV-6/190- 69 propeller. The Sling 4 HW is a utility aircraft, that is both nimble and capable, with up to 520 kg of useful load. It is not intended for aerobatic operation.

  • Page 13: Warnings, Cautions And Notes

    Sling 4 HW Section 1 Pilot Operating Handbook General Information Warnings, Cautions and Notes The following definitions apply to warnings, cautions and notes in the Pilot Operating Handbook. WARNING Warning – Indicates that non-observation of the corresponding procedure leads to serious and immediate degradation of flight safety.

  • Page 14: Aircraft 3-View Drawing

    Section 1 Pilot Operating Handbook General Information Aircraft 3-View Drawing 1.3.1 Sling 4 HW Tricycle Model DIMENSIONS IN THESE DRAWING ARE IN MILLIMETRES. CAUTION Do not use these values for weight and balance, as they are overall dimensions for illustration purposes and do not use the prescribed reference plane.
  • Page 15 Sling 4 HW Section 1 Pilot Operating Handbook General Information DIMENSIONS IN THIS DRAWING ARE IN MILLIMETRES. Document Number: DC-POH-001-X-G-2.0 Page | 1-4 Revision: 2.0 Date: 2025/01/28...

  • Page 16: Data For Sling 4 Hw Aircraft And Systems

    Sling 4 HW Section 1 Pilot Operating Handbook General Information Data for Sling 4 HW Aircraft and Systems 1.4.1 Wing Parameter Value Wingspan 9.57 m / 31ft. 39in. Mean Aerodynamic Chord 1,340 mm / 52.76 in. Wing Surface Area 11.83 m / 127.34 ft...

  • Page 17: Control Surface Travel Limits

    Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.4.4 Landing Gear Parameter / Item Value Wheel Track 2.05 m / 6 ft. 7 in. Wheelbase 1.87 m /6 ft. 14 in. Brake Type Hydraulic Main Gear Tyres 15x6.00-6; 6-ply (2.2 bar / 32 psi) Nose Wheel Tyres 5.00-5;...
  • Page 18 Sling 4 HW Section 1 Pilot Operating Handbook General Information Propeller Parameter / Item Value Manufacturers Airmaster AP430CTF-WWR72B AP430CTF-SNR70E MTV-6/190-69 Number of Blades Diameter AP430CTF-SNR70E 70”/ 1.78m AP430CTF-WWR72B 72” / 1.83m MTV-6/190-69 75” / 1.90m Material/Type Composite 1.4.8 Fuel Parameter / Item...
  • Page 19 Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.4.9 Oil System Parameter / Item Value Oil System Type Forced with external oil reservoir. Automotive grade API “SG” type oil, or higher, preferably synthetic, or semi-synthetic. When operating on unleaded fuels or MOGAS, fully synthetic oil is recommended.

  • Page 20: Maximum Weights

    Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.4.11 Maximum Weights Parameter Value Maximum Take-off Weight 1,120 kg (2,469.17 lb.) Maximum Landing Weight 1,120 kg (2,469.17 lb.) Maximum Total Baggage Weight 35 kg (77 lb.) (Main Area + Golf Club Extension) Maximum Baggage Weight 35 kg (77 lb.)

  • Page 21: Terminology, Symbols And Conversion Factors

    Sling 4 HW Section 1 Pilot Operating Handbook General Information Terminology, Symbols and Conversion Factors 1.5.1 General Terminology Acronym Description Alternating Current AHRS Attitude and Heading Reference System Anti-Knock Index Altimeter American Petroleum Institute Airspeed Indicator AVGAS Aviation Gasoline Communication (Radio)
  • Page 22 Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.5.2 Speed and Performance Terminology Acronym Description Indicated Airspeed. Calibrated Airspeed – the indicated airspeed corrected for position KCAS and instrument error, expressed in knots. Indicated Airspeed – the speed shown on the airspeed indicator, KIAS expressed in knots.

  • Page 23: Meteorological Terminology

    Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.5.3 Meteorological Terminology Acronym Description International Standard Atmosphere The local pressure setting that if set on the subscale of an altimeter, the altimeter will indicate local altitude above mean sea level.
  • Page 24 The reference datum is an imaginary vertical plane from which all horizontal distances are measured for weight and balance Datum purposes. The Sling 4 HW datum is the forward, flat propeller mounting flange on the Rotax engine. Empty The weight of the airplane with engine fluids at operating levels.
  • Page 25 Sling 4 HW Section 1 Pilot Operating Handbook General Information 1.5.7 Useful Conversion Factors Imperial Metric pound 0.4536 kilogram pound per square kilopascal 6.895 inch inch 25.4 millimetres foot 0.3048 metres statute mile 1.609 kilometres nautical mile 1.852 kilometres hectopascal...

  • Page 26: Supporting Documents

    Sling 4 HW Section 1 Pilot Operating Handbook General Information Supporting Documents The following documents are regarded as supporting documents to this Pilot Operating Handbook: 1. Latest revision of the Operators Manual for the Rotax® 915 iS A Series or the Rotax® 916 iS.

  • Page 27: Limitations

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2 Limitations Introduction ................2-1 Airspeed Limitations ..............2-1 Airspeed Indicator Markings ............. 2-2 Stall Speed Adjustment for Turning Flight ........ 2-3 Crosswind and Wind Limitation (Demonstrated) ...... 2-4 Service Ceiling ................2-4 Load Factors ................

  • Page 28: Introduction

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations Introduction This section includes operating limitations, instrument markings and placards necessary for the safe operation of the Sling 4 HW, its engine, systems and equipment. Airspeed Limitations Speed KIAS Remarks Never Exceed...

  • Page 29: Airspeed Indicator Markings

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations Airspeed Indicator Markings Marking KIAS Significance Flap Operating Range White Arc 53-85 Lower Limit - V (At MAUW) Upper Limit - V (Max. flap extend speed) Normal Operating Range Green Arc...

  • Page 30: Stall Speed Adjustment For Turning Flight

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations Stall Speed Adjustment for Turning Flight Stall speeds listed earlier in this section are for straight and level flight, at a load factor of 1g. Speeds should be adjusted for turning flight or increased load factor.

  • Page 31: Crosswind And Wind Limitation (Demonstrated)

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations Crosswind and Wind Limitation (Demonstrated) Item Value Maximum demonstrated crosswind 15 kts component for take-off and landing Service Ceiling Item Value Service Ceiling 23,000 ft. / 7,010m Load Factors Item Value Maximum positive limit load factor +3.8 g...

  • Page 32: Centre Of Gravity Range

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations Centre of Gravity Range Item Value Centre of front face of engine propeller Datum flange (without propeller extension). Reference Lower ledge of the door (with door open). (Longitudinal Levelling) Reference Floor panel between pilot seat and peddles.

  • Page 33: Prohibited Manoeuvres

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.10 Prohibited Manoeuvres The Sling 4 HW is approved for normal manoeuvres, including the following: • Steep turns not exceeding 60° • Lazy Eights • Chandelles • Stalls (not including whip stalls) WARNING Aerobatics and intentional spins are prohibited.

  • Page 34: Kinds Of Operation

    Pilot Operating Handbook Limitations 2.13 Kinds of Operation 2.13.1 Normal VFR Operation The Sling 4 HW, in standard configuration, is only approved for day VFR operation with visual contact with terrain. Minimum equipment is as follows: Equipment Altimeter, with encoding transponder...
  • Page 35 Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.13.3 IFR Operation Provided that the aircraft is appropriately equipped, the aircraft may safely be flown under IFR. Depending on the practical and legal requirements of the judicial region the aircraft will be operated in, the aircraft may also be flown in IMC conditions, in accordance with IFR.

  • Page 36: Engine Limitations

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.14 Engine Limitations Instruments reflecting engine parameters should, in each case, be marked / set to reflect the minimum and maximum figures. Always refer to the latest edition / revision of the Engine Operators Manual for latest information regarding operating limitations.
  • Page 37 Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.14.3 Engine Operational and Speed Limits Parameter Value Engine Model ROTAX 915 iS Engine Manufacturer Bombardier-Rotax GMBH 104 kW / 139.5 hp at 5,800 rpm, Maximum take-off Power max. 5 minutes...

  • Page 38: Other Limitations

    Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.15 Other Limitations • No smoking is allowed on-board the airplane. • VFR only flights are permitted unless the operator has equipped the aircraft correctly for IFR flight. WARNING Intentional flights under icing conditions are prohibited! 2.16 Flight in Precipitation...

  • Page 39: Limitation Placards

    The following limitation warning placards must be placed in the aircraft and positioned in plain view of the pilot and passenger. 2.17.1 Instrument Panel Standard Sling 4 High Wing OPERATE UNDER VMC ONLY MAXIMUM PERMISSIBLE AIRSPEED 135 KIAS MAXIMUM PERMISSIBLE RPM 5,800 RPM FOR 5 MINUTES MAXIMUM CONTINUOUS RPM 5,500 MAXIMUM PERMISSIBLE MASS 1,120 KG/2,469.17 LB...
  • Page 40 Standard Sling 4 High Wing AVGAS MOGAS 99 LITRES 2.17.4 Inboard Upper Wing Flap Surface All Sling 4 High Wing s NO STEP 2.17.5 Fireproof Metal Plate Attached to Aircraft Standard Sling 4 High Wing ZU-### CONSTRUCTOR – SLING AIRCRAFT MODEL –...
  • Page 41 Sling 4 HW Section 2 Pilot Operating Handbook Limitations 2.17.6 Exterior of Baggage Door All Sling 4 High Wing s MAX TOTAL BAGGAGE WEIGHT – 35 kg / 77 lb. 2.17.7 Other Placards The aircraft must be placarded to show the following: •...

  • Page 42: Emergency Procedures

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3 Emergency Procedures Introduction ................3-1 Speeds for Emergency Operations ..........3-2 Engine Related Emergencies ............. 3-3 Emergency Landing Procedures ..........3-7 Smoke and Fires ..............3-10 Recovery from Unintentional Spin .......... 3-13 Other Emergencies ..............
  • Page 43 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Introduction This section provides checklists and procedures for coping with various emergencies that may arise. Emergencies caused by aircraft or engine malfunction are extremely rare if the appropriate procedures are followed, such as pre-flight inspections and general maintenance.

  • Page 44: Speeds For Emergency Operations

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Speeds for Emergency Operations Speed KIAS Remarks This speed (MAUW, flaps up) results in the best gliding distance, along the ground. Horizontal distance travelled (in still air) is approximately: Propeller -...

  • Page 45: Engine Related Emergencies

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Engine Related Emergencies 3.3.1 Engine Failure During Take-off 1. Throttle ......... IDLE 2. Brakes ..........APPLY with aircraft under control – 3. Ignition Lanes ........ OFF (A & B) 4. Master ........... OFF 5.

  • Page 46: Engine Failure During Flight

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.3.3 Engine Failure During Flight 1. Airspeed ........80 KIAS 2. Landing Area ......... LOCATE ( CLEAR GROUND) 3. Air Start ......... COMMENCE If engine restart is successful – 4. Continue ........PROCEED WITH CAUTION 5.
  • Page 47 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.3.5 Irregular Engine RPM 1. Ignition Lanes ........ ON (A & B) 2. Throttle ......... VERIFY POSITION 3. ECU Backup Switch ......ON 4. Fuel Quantity ......... CHECK 5. Fuel Selector ........CHANGE...
  • Page 48 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.3.7 Low Oil Pressure 1. Oil - Temperature ......CHECK (MAX. 130 °C) If oil temperature is high or increasing – 2. Airspeed ........80 KIAS If oil pressure remains low or temperature remains high/increasing –...

  • Page 49: Emergency Landing Without Engine Power

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Emergency Landing Procedures 3.4.1 Emergency Landing without Engine Power 1. Airspeed ........80 KIAS 2. Trim ..........FOR BEST GLIDE 3. Landing Location ......LOCATE 4. Engine Air-start ......ATTEMPT...

  • Page 50: Precautionary Landing With Engine Power

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.4.2 Precautionary Landing with Engine Power 1. Airspeed ........75 KIAS 2. Flaps ..........TAKE-OFF 3. Fuel Pumps ........BOTH ON (MAIN & AUX) 4. Feed Pump ........ON 5. Landing Area ......... INSPECT (AS PER PROCEDURE) 6.
  • Page 51 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.4.4 Landing with a Flat Tyre/Damaged Wheel 1. Approach ........NORMAL 2. Airspeed ........65 KIAS 3. Airspeed at flare ....... SLOWEST PRACTICAL (≈ 60 ��������) If nosewheel is damaged/flat –...
  • Page 52 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Smoke and Fires 3.5.1 Engine Fire on Ground During Start 1. Starter ........... RELEASE 2. Fuel Selector ........CLOSE 3. Fuel Pumps ........BOTH OFF (MAIN & AUX) 4. Feed Pump ........OFF 5.
  • Page 53 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.5.3 Engine Fire during Take-off Run 1. Throttle ......... IDLE 2. Cabin Heat ........CLOSE 3. Brakes ..........APPLY UNTIL STOP 4. Fuel Selector ........CLOSE 5. Fuel Pumps ........BOTH OFF (MAIN &...

  • Page 54: Electrical Fire In Flight

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.5.5 Electrical Fire in Flight An electrical fire is often characterized by white smoke and an acrid smell. (a)(b) 1. Master ..........OFF 2. Ignition Lanes ........REMAIN ON (A & B) 3.

  • Page 55: Recovery From Unintentional Spin

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Recovery from Unintentional Spin WARNING Intentional Spins are Prohibited! Unintentional spin recovery technique: 1. Throttle ......... IDLE 2. Lateral Control ....... AILERONS NEUTRAL 3. Yaw Control ........FULLRUDDERIN OPPOSITE DIRECTION OF SPIN 4.

  • Page 56: Other Emergencies

    Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures Other Emergencies 3.7.1 Propeller Control Failure The propeller/propeller controller can fail in various modes/ways. The pilot should completely familiarize themselves with the Airmaster propeller operator’s manual, and specifically the section that deals with Emergency Operation and Failure Modes.
  • Page 57 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.7.2 Engine Vibration / Rough Running If any abnormal engine vibrations occur: 1. Fuel ..........CHECK QUANTITY 2. Fuel Pumps ........BOTH ON (MAIN & AUX) 3. Feed Pump ........ON 4.
  • Page 58 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.7.4 Alternator / Charge System Failure An alternator A/B failure is indicated by the lane warning lights. 3.7.4.1 Alternator A Failure – Alternator A failure is evident by the steady illumination of the lane A warning light, and a drop in the main bus voltage to nominal battery voltage (+/- 12.5 V)
  • Page 59 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.7.4.2 Alternator B Failure – Alternator B failure is evident by the steady illumination of the Lane B warning light, and a drop in the main bus voltage to nominal battery voltage (+/- 12.5 V).
  • Page 60 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.7.4.3 Alternator A and B Dual Failure – This will result in engine failure when the main battery goes flat, as no power is available to the ECU and subsequently the fuel pumps. These must be powered by the main battery in order for the engine to run.
  • Page 61 Sling 4 HW Section 3 Pilot Operating Handbook Emergency Procedures 3.7.4.4 Loss of Sensors For redundancy purposes the engine sensors, are powered by Lane A/B separately. This means that if one of the two lanes fails, a subset of the engine sensors will also fail.

  • Page 62: Normal Procedures

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4 Normal Procedures Introduction ................4-1 Speeds for Normal Operation ........... 4-1 Pre-flight Inspection..............4-2 Engine Start and Taxi ..............4-9 Before Take-off ............... 4-14 Take-off ................... 4-16 Flight ..................4-17 Landing ...................

  • Page 63: Speeds For Normal Operation

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Introduction This section provides checklists and recommended procedures for normal operation of the aeroplane. The checklists proposed are considered to be the most desirable, and checks should follow them, unless there is a valid reason to deviate.

  • Page 64: Preflight Inspection

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Pre-flight Inspection A pre-flight inspection is required prior to every flight. It must also be performed after any incident, accident, maintenance activity etc. Incomplete or careless inspections can result in an accident. Carry out the inspection following the instructions on the Inspection Checklist.

  • Page 65: Inspection Checklist

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.3.1 Inspection Checklist 4.3.1.1 Cabin Ignition ........OFF Master Switch ......ON Fuel ..........VERIFY QUANTITY Flaps........... FULL DOWN Avionics ........VERIFY CONDITION Master Switch ......OFF Controls (all) ......CHECK (for full, free movement up to stops) Harnesses and Seats ....
  • Page 66 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.3.1.3 Empennage Tie-Down Rope ......REMOVED Horizontal Stabilizer ..... CHECK CONDITION Vertical Stabilizer ......CHECK CONDITION Elevator........CHECK CONDITION / MOVEMENT Elevator Trim Tab ......CHECK CONDITION Rudder ......... CHECK CONDITION / MOVEMENT Hinges, Bolts, Pushrods ....
  • Page 67 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures WARNING Physically verify the fuel level before each take-off. Fuel can be seen, through the filler cap. If the fuel is just covering the (total) bottom of the fuel tank then there is approximately30 litres present.
  • Page 68 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures CAUTION During the inspection of the propeller , make sure the ignition is OFF. Always handle the propeller blade area with the palm of your hand, and not only the tips of your fingers.
  • Page 69 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures WARNING Physically verify the fuel level before each take-off. Fuel can be seen, through the filler cap. If fuel is just covering the (total) bottom of the fuel tank then there is approximately 30 litres present.
  • Page 70 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.3.1.7 Tyre Pressure Visual Inspection The tyres must be visually inspected prior to every flight. It is not necessary to check the pressure of the tyre with a gauge; it is sufficient to visually inspect the tyre.
  • Page 71 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Engine Start and Taxi 4.4.1 Before Engine Start Pre-flight Inspection ....COMPLETE Emergency Equipment....ON BOARD Passenger Briefing ....... COMPLETE Seats ..........CORRECTLY ADJUSTED Harnesses ........SECURE Park Brake ........ON Circuit Breakers ......

  • Page 72: Engine Start

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.4.2 Engine Start 1. Master Switch ......ON 2. EFIS Backup Switch ....ON (VERIFY BATTERY VOLTAGE) 3. ECU Backup Switch ....ON 4. Lane A and B Switch ....ON...
  • Page 73 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures After Engine Start 1. Engine instruments ....... CHECK (CHECK IF IN RANGE WITH OPERATIONAL LIMITS) 2. Throttle......... SET (+/- 2000 RPM AND HOLD FOR 2 MINUTES) 3. Throttle......... SET (+/-...
  • Page 74 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.4.2.1 Start Throttle Position vs. Oil Temperature NOTE Since the engine tends to vibrate substantially with low throttle settings on start-up, start the engine with the throttle set as per the graph above to achieve a throttle RPM of approximately 2,000 rpm.
  • Page 75 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.4.3 Taxi 1. Flaps ........UP 2. Brakes ........OFF 3. Controls ........INTO WIND OR NEUTRAL 4. Power ........AS REQUIRED 5. Brakes ........CHECK AT START OF TAXI Document Number: DC-POH-001-X-G-2.0...

  • Page 76: Before Takeoff

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Before Take-off To be conducted at a holding point or equivalent – 4.5.1 Run Up & Pre-Take-off 1. Direction ......INTO WIND (IF POSSIBLE) 2. Oil Temperature ....ABOVE 50°C 3.
  • Page 77 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures NOTE a) Lane Check Switch off each lane for 15 second, then switch back on. Wait until the lane warning light extinguishes (+/- 3 sec) before proceeding to the next lane / check. No more than 250rpm increase / decrease during check.
  • Page 78 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Take-off 1. Throttle ......FULL OPEN 2. Engine Speed ....VERIFY 5,800 RPM 3. Elevator Control ..... NEUTRAL 4. Engine Parameters ..VERIFY (PRESSURES, TEMPERATURES) 5. Rotate ......58KIAS 6. Airspeed ......75 KIAS (Vₓ...
  • Page 79 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Flight 4.7.1 Climb Throttle ......GREATER THAN 5,200 RPM 2. Airspeed ............ V – 80 KIAS ......CRUISE 80 – 90 KIAS 3. Trim ......... AS REQUIRED 4. Engine Parameters ..VERIFY...
  • Page 80 Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.7.3 Descent 1. ATIS / Weather ....CHECKED 2. Altimeter ......SET 3. Fuel Selector ......FULLEST TANK (AUX PUMP ON DURING SWITCH) 4. Lights ........AS REQUIRED 5. Seatbelts ......CHECKED 6.

  • Page 81: Before Landing

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Landing 4.8.1 Before Landing 1. Brakes ......CHECK PARK BRAKE IS OFF 2. Fuel Pumps ...... BOTH ON (AUX & MAIN) 3. Feed Pump ...... ON (BOTH) 4. Airspeed ......80 KIAS 5.

  • Page 82: Normal Landing

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.8.3 Normal Landing 1. Airspeed @50 ft ....75 KIAS 2. Power ......AS NEEDED 3. Flare ........ TO MINIMUM FLIGHT SPEED 4. Touchdown ..... MAINS FIRST (HOLD NOSE WHEEL OFF) 5.

  • Page 83: Engine Shutdown

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.8.5 Engine Shutdown 1. Engine Speed ........IDLE (+/-1,800rpm) 2. Park Brake ......... SET 3. Engine Parameters ......WITHIN LIMITS (wait 2 minutes if increased operating temperature) 4. Lane B ..........OFF 5.

  • Page 84: Special Procedures

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures Special Procedures 4.9.1 Baulked / Rejected Landing 1. Throttle ........FULL / 5,800 RPM 2. Flaps ........RETRACT SLOWLY ........STAGE 1 @70 KIAS ........UP @ 75 KIAS, min. 300ft.

  • Page 85: Short Field Landing

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.9.3 Short Field Landing 1. Approach ......FLAT / UNDER POWER 2. Throttle ......AS REQUIRED 3. Approach Airspeed ..70 KIAS 4. Throttle ......IDLE 5. Flare ........ COMMENCE 6.

  • Page 86: Soft Field Take-Off

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.9.5 Soft Field Take-off 1. Aircraft Weight ....MINIMISE 2. Elevator Trim ....NEUTRAL 3. Flaps ........ STAGE 2 4. Propeller ......T.O. (5,800 RPM) 5. Engine Parameters ..VERIFY (PRESSURES, TEMPERATURES) 6.

  • Page 87: Crosswind Take-Off

    Sling 4 HW Section 4 Pilot Operating Handbook Normal Procedures 4.9.6 Crosswind Take-off 1. Aileron ......FULL INTO WIND 2. Take-off Procedure ..NORMAL 3. Aileron ......REDUCE INPUT AS REQUIRED NOTES a. As the aircraft accelerates, the pilot must reduce aileron input to avoid the wing hitting the ground.

  • Page 88: Performance

    Sling 4 HW Section 5 Pilot Operating Handbook Performance 5 Performance Introduction ................5-1 Take-off and Landing Distance ..........5-1 Rate of Climb ................5-2 Cruise Speeds ................5-3 Fuel Consumption ..............5-4 Airspeed Indicator System Calibration ........5-5 Document Number: DC-POH-001-X-G-2.0 Page | 5-0 Revision: 2.0...

  • Page 89: Take-Off And Landing Distance

    Sling 4 HW Section 5 Pilot Operating Handbook Performance Introduction The data presented in this section has been gathered from flight tests performed in the aircraft with the engine in good condition using average piloting techniques. If not otherwise stated, the performance in this section is valid for: •...

  • Page 90: Rate Of Climb

    Sling 4 HW Section 5 Pilot Operating Handbook Performance Rate of Climb Values relevant for maximum continuous power of 5,500 RPM – Best Rate of Rate of Altitude Climb Speed Climb [ft. ISA] [fpm] [KIAS] 1,000 2,000 3,000 4,000 6,000...

  • Page 91: Cruise Speeds

    ECO mode, which results in an approximate fuel consumption change from 28 LPH to 33 LPH in the cruise propeller setting. c) Cruise information for the Sling 4 HW is tabled using a 75% power setting at 5,000RPM. Document Number: DC-POH-001-X-G-2.0 Page | 5-3 Revision: 2.0...

  • Page 92: Fuel Consumption

    Sling 4 HW Section 5 Pilot Operating Handbook Performance Fuel Consumption Engine Power 100% MAX ECO Engine RPM 5,800 5,500 5,000 5,000 5,000 Fuel Burn 11.4 10.3 7.40 7.13 Endurance [hrs] Range [nm] 1,000 ft. Range [nm] 5,000 ft. Range [nm] 10,000 ft.
  • Page 93 Sling 4 HW Section 5 Pilot Operating Handbook Performance Airspeed Indicator System Calibration [knots] [knots] [knots] (this aircraft) (average Document Number: DC-POH-001-X-G-2.0 Page | 5-5 Revision: 2.0 Date: 2025/01/28...

  • Page 94: Weight And Balance

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance 6 Weight and Balance Introduction ................6-1 Installed Equipment List ............6-1 Centre of Gravity Arms ............. 6-2 CG Envelope ................6-3 Determination of CG ..............6-4 Determination of Empty CG ............6-6 CG Determination (Example) ............

  • Page 95: Introduction

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance Introduction This section details weight and balance information together with payload ranges for safe operation of the aircraft. Installed Equipment List Type Equipment Item Garmin G3X Glass Cockpit Garmin GTX 35 Transponder...

  • Page 96: Centre Of Gravity Arms

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance Centre of Gravity Arms 2170 1969 WARNING Aircraft CG and MAUW limitations must be adhered to at all times. NOTE • GC range is 1,969 mm (6.460 ft) to 2,170 mm (7.120 ft) aft of the reference datum (18% to 33% of MAC).

  • Page 97: Cg Envelope

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance CG Envelope Allowable CG Envelope 2502 1100 2302 1000 2102 FLIGHT ONLY PERMITTED IF 1902 INSIDE THE ENVELOPE 1702 1502 1302 1102 CG position [%MAC] WARNING Aircraft CG and MAUW limitations must be adhered to at all times.

  • Page 98: Determination Of Cg

    Section 6 Pilot Operating Handbook Weight and Balance Determination of CG Sling Aircraft makes use of a numerical method in calculating the CG of the aircraft. The following will be required to complete a CG check: Item Empty CG Value...
  • Page 99 Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance The aircraft’s empty CG is determined in a conventional manner, by weighing the aircraft whilst it is standing level. Refer to the Maintenance Manual for more. Maximum all up weight (MAUW) = 1120 kg (2469.17 lb) Maximum useful load (example): ��...

  • Page 100: Determination Of Empty Cg

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance Determination of Empty CG ITEM WEIGHT MOMENT [kg (lb)] [mm (ft)] (weight x arm) [kg.mm (lb.ft)] Right Main Wheel W = 2 384 (7.82) Left Main Wheel = 2 384 (7.82) Nose Wheel = 517 (1.7)

  • Page 101: Cg Determination (Example)

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance CG Determination (Example) Moment Weight (weight x arm) [kg (lb)] [mm (ft)] [kg.mm (lb.ft)] Crew [Front] 140 (309) 1 958 (6.42) 274 120 (1 982.71) Passengers 120 (265) 2 941 (9.65) 352 920 (2 552.268)

  • Page 102: Blank Cg Form And Graph For Use

    Sling 4 HW Section 6 Pilot Operating Handbook Weight and Balance Blank CG Form and Graph for Use Moment Weight (weight x arm) [kg (lb)] [mm (ft)] [kg.mm (lb.ft)] Crew [Front] 1 958 (6.42) Passengers [Rear] 2 941 (9.65) Baggage 3 448 (11.32)

  • Page 103: Aircraft And Systems

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7 Aircraft and Systems Airframe ..................7-1 Control System / Pilot Controls ..........7-2 Landing Gear ................7-8 Safety Harness and Seats ............7-8 Baggage Compartment ............. 7-9 Pitot and Static Systems ............7-10 Cockpit Layout ................
  • Page 104 Ground Handling Servicing Airframe The Sling 4 HW has a composite and metal construction with single curvature stressed aluminium alloy skins riveted to stiffeners. Construction is of 6061-T6 aluminium alloy sheet metal riveted to angles, of the same material, with high quality blind rivets. This high...

  • Page 105: Control System / Pilot Controls

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Control System / Pilot Controls 7.2.1 Control Column(s) The aircraft is equipped with dual control sticks, which manipulate two of the three control axes: pitch (elevator) and roll (aileron). The stick...

  • Page 106: Brake Controls

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.2.3 Brake Controls 7.2.3.1 Brake Lever – The braking system is typically a single hydraulic master cylinder acting on both wheels of the main landing gear, through a disk/calliper arrangement.

  • Page 107: Throttle Lever

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.2.3.4 Brake System Diagram 7.2.4 Throttle Lever The aircraft makes use of a single lever power system, as the propeller is normally only ground-adjustable and mixture is controlled by the ECU.
  • Page 108 The accidental operation of the lever is prevented by a locking pin, which is tagged with a red flag. Standard Sling 4 High Wing This pin must be removed before flight. Document Number: DC-POH-001-X-G-2.0 Page | 7-5 Revision: 2.0...
  • Page 109 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.2.7 Electrical equipment / control switches SWITCH / FUNCTION POSITION LABEL Power disconnected from main bus. MASTER / STARTER KEY Main bus connected to power. SWITCH Engage starter motor.

  • Page 110: Elevator Trim

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.2.9 Elevator Trim Elevator trim is electrically controlled by buttons on the control column, and these buttons are detailed in 7.2.1 Control Column(s). The trim motor is located in the left elevator (if facing forward) and drives the trim tab.

  • Page 111: Cabin Heat

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.2.11 Cabin Heat Heated air, warmed by the heat exchanger with the engine exhaust, can be controlled via the heater box control panel, located on the roof of the cockpit.

  • Page 112: Baggage Compartment

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Baggage Compartment The baggage compartment comprises of two sections, main baggage and golf club extension, positioned behind the seats and is designed to carry up to 35 kg (77 lb) in total.

  • Page 113: Pitot And Static Systems

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Pitot and Static Systems A pitot tube is located below the left wing, and the relevant pressures, experienced by the pitot, are transferred to the instrument through flexible hoses. The pitot features a second hole for the measurement of angle of attack.

  • Page 114: Cockpit Layout

    Ground Handling Servicing Cockpit Layout The basic cockpit layout is the same for all Sling 4 HW aircraft, notwithstanding that instrumentation may differ substantially. All airplanes contain the minimum instrumentation, but particular airplanes may contain additional instrumentation. The basic cockpit layout is configured as in the diagram, with key, below: Document Number: DC-POH-001-X-G-2.0...
  • Page 115 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Cockpit Layout Key Instrument panel Air vent Control Stick (With PTT, Trim, AP Control) Brake actuator (if footbrake not fitted) Headset plugin sockets Park-brake actuator valve Throttle Seat adjustment lever...

  • Page 116: Instruments And Avionics

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Instruments and Avionics The diagram below represents an instrument panel containing the required minimum instrumentation, together with typical back-up and additional instrumentation supplied with the aircraft. The instrument panel in any particular aircraft may differ from that illustrated below, as choice of instruments and layout is decided by the customer.
  • Page 117 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Key containing switches and circuit breakers for standard panel configuration: SWITCHES CIRCUIT BREAKERS MASTER FUSEBOX LANE A LANE B PROP ECU BACKUP GEA 24 MAIN/FEED PUMP GSU 24 AUX PUMP...
  • Page 118 EFIS System The Garmin G3X multifunction “Glass Cockpit” instrument is the standard EFIS used by Sling Aircraft. This instrument incorporates a range of different instruments and functions. The full instrumentation provided by the EFIS will typically include, but not limited to:...
  • Page 119 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing The EFIS installed can be powered from two separate systems: • Main Bus o Through the main EFIS switch, labelled “EFIS” • Back-up Battery o Through the selection switch, labelled “EFIS BKUP”...

  • Page 120: Minimum Instruments And Equipment Required For Flight

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.8.2 Minimum Instruments and Equipment Required for Flight The following minimum instrumentation and equipment is required for day VFR flight: # Item 1 Altimeter 2 Airspeed Indicator 3 Compass...
  • Page 121 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Engine The engine fitted, as standard, is the Rotax 915 iS. This engine is a 4- stroke, turbocharged, 4-cylinder, horizontally opposed, spark ignition engine, with one central camshaft -pushrod OHV and a displacement of 1352cc (1.35L/82.5 cubic inch).

  • Page 122: Cooling System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.10 Cooling System Cylinders are air-cooled through forced air circulation, from the inlets on the nose of the cowl, over cooling fins on the barrels. Cylinder heads are liquid cooled via a closed-circuit system, with an expansion tank.

  • Page 123: Electric System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.11 Electric System 7.11.1 Broad Overview Diagram Document Number: DC-POH-001-X-G-2.0 Page | 7-20 Revision: 2.0 Date: 2025/01/28...

  • Page 124: Charge System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.11.2 Charge System The alternating current (AC) output of the two alternators (A and B) is passed through a rectifier, where it is converted to direct current (DC) for the aircraft systems. The charge system output is approximately 13.5 to 14V (from 1000 +/- 250 rpm and higher).

  • Page 125: Ignition Switches

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.11.5 EFIS Back-up Battery / Circuit The 12V EFIS back-up battery is mounted on the cabin side of the firewall, under the instrument panel. 7.11.6 Master and Starter Switches The master switch is a toggle switch located on the left side of the instrument panel.
  • Page 126 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.11.9 Circuit Breakers Circuit breakers are push-to-reset (i.e. push in) for restoring/supplying electrical power to their corresponding electrical circuits. Circuit breakers are located on the instrument panel. 7.12 Propeller 7.12.1...
  • Page 127 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.12.2 Propeller Controller 7.12.2.1 Diagram FINE INDICATOR LIGHT AUTOMATIC / MANUAL SELECTOR SWITCH COARSE INDICATOR LIGHT PROPELLER CONTROL SELECTOR KNOB (BLUE) PITCH ADJUST SWITCH FEATHER INDICATOR LIGHT FEATHER ENGAGE SWITCH Document Number: DC-POH-001-X-G-2.0...
  • Page 128 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.12.2.2 Operation of the propeller controls • The power switch, labelled PROP, located on the instrument panel. This switch activates/deactivates the power supply to the propeller control unit and propeller pitch adjustment motor.
  • Page 129 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing • Manual propeller control switch is a toggle button, located separately from the propeller controller unit on the instrument panel. This switch allows: o Direct control of the propeller pitch when manual mode (MAN) is selected with the automatic/manual selector switch.
  • Page 130 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.12.2.3 Indicator Lights Information conveyed to the pilot by the propeller system is through three lights located on the propeller controller, namely Coarse, Fine and Feather indicator lights. The following table lists the various propeller status indications provided by the lights.

  • Page 131: Fuel System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.13 Fuel System The aircraft makes use of two main fuel tanks, located in the leading edge of each wing. Each tank has a volume of 99 litres, leading to total volume of 198 litres.
  • Page 132 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing Document Number: DC-POH-001-X-G-2.0 Page | 7-29 Revision: 2.0 Date: 2025/01/28...
  • Page 133 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.13.1 Main and Auxiliary Fuel Pumps The main and auxiliary fuel pumps are powered via the EMS/ECU. As long as power is available to the EMS/ECU, both fuel pumps can be selected/operated, irrespective of the master switch status.

  • Page 134: Lubrication System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.14 Lubrication System The engine is provided with a dry sump forced lubrication system with a camshaft driven pump, with an integrated pressure regulator. The pump delivers oil from the oil reservoir, through an oil cooler and oil filter to points of lubrication.

  • Page 135: Autopilot System

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.15 Autopilot System The autopilot system is integrated into / with the EFIS unit. The EFIS / autopilot inputs data from an electronic compass and AHRS. With this, it controls two servos (one for pitch and one for roll), linked to the aircraft control system.

  • Page 136: Position, Anti-Collision, Taxi And Landing Lights

    Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.16 Position, Anti-collision, Taxi and Landing Lights The aircraft is equipped with a landing and taxi light in the leading edge of the wing. The standard option is left wing only, with an optional extra for left and right wing.

  • Page 137: Ground Handling

    7.17.1 Introduction This section contains factory-recommended procedures for proper ground handling and servicing of the Sling 4 HW. It also identifies certain inspection and maintenance requirements, which should be followed at all times. Full details for servicing and maintenance appear in the aircraft maintenance manual.
  • Page 138 The nose wheel is fully rotated once the pedal control stops have been engaged. For installation of the tow bar refer to the Sling 4 HW Maintenance Manual. WARNING When steering the aircraft with the tow bar, care should be taken to not rotate the nose wheel too violently or too far.
  • Page 139 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.17.2.4 Parking It is advisable to park the aircraft inside a hangar, or alternatively inside other suitable spaces, with good temperature, good ventilation, low humidity and dust-free. When parking for extended periods, cover the windscreen and windows, and possibly the whole aircraft by means of a suitable tarpaulin.
  • Page 140 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.17.2.5 Mooring The aircraft should be tied down when parked outside the hangar. Mooring is necessary to protect the aircraft against possible damage caused by wind and gusts. For this reason, the aircraft is equipped with mooring eyes located on the lower surfaces of the wings and one under the tail.
  • Page 141 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.17.2.6 Road Transporting The aircraft may be transported after loading on a suitable, aircraft specific trailer, or a flatbed with suitable rigging. It is necessary to remove the wings before road transport. It is suggested that the wings should be securely stored in a cradle of some kind.
  • Page 142 Sling 4 HW Section 7 Pilot Operating Handbook Ground Handling Servicing 7.17.3 Servicing 7.17.3.1 Jacking Since the empty weight of the aircraft is relatively low, two people are usually able to lift the aircraft. It is possible to lift the aircraft in the following manner: •...
  • Page 143 NOTES a. Both the manufacturers’ Operators Manual and Maintenance Manual. More detail is supplied in the Sling 4 HW Maintenance Manual. 7.17.3.3 Aircraft Modifications and Repairs It is recommended that you contact the aircraft manufacturer prior to making any modifications to the aircraft, to ensure that the airworthiness of the aircraft is not affected.
  • Page 144 Servicing fuel, Oil and Coolant This document makes a brief statement on these topics in Section 1. Before carrying out any work, refer to the Rotax Maintenance and Operators Manual, along with the Sling 4 HW Aircraft Maintenance Manual. 7.17.4...

  • Page 145: Supplementary Information

    Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8 Supplementary Information Introduction ................8-1 Supplement 01/2021 – Magnum 901 Ballistic Parachute ..8-2 Supplement 02/2021 – External Alternator ......8-4 Supplement 08/2021 – Tail Dragger Information ..... 8-6 Supplement 05/2022 –...
  • Page 146 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Introduction This section contains the appropriate supplements necessary to operate the aircraft safely and efficiently when equipped with various common optional extras not supplied with the standard aircraft. The supplements included in this manual are –...
  • Page 147 This supplement provides information necessary for the operation of an aircraft fitted with a Magnum 901 ballistic parachute. • The Sling 4 HW is specifically designed for convenient fitment of the Magnum 901 ballistic parachute recovery system, manufactured by Stratos 07. The system is designed to enable...
  • Page 148 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.2.2 Ballistic Parachute Operational Parameters Parameter Value Limit Deployment Speed 150 kt or 277 km/h . Deployment Time (at Limit Speed) Maximum Supported Mass 1120kg or 2469 lb. Descent Rate (at Maximum Mass)

  • Page 149: Operational Parameters

    Supplement 02/2021 – External Alternator Information contained in this supplement adds to or replaces information from the standard Sling 4 HW Pilot Operating Handbook with regard only to the specific sections addressed herein. Limitations, procedures and information not addressed in this supplement remain as set out in Sling 4 HW Pilot Operating Handbook.
  • Page 150 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.3.3 External Alternator Wiring 8.3.4 Effect on Mass and Balance The CG range mentioned in Section 1 of this document continues to apply and following fitment of the external alternator, the empty CG of the aircraft should be measured and appropriately recorded.
  • Page 151 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Supplement 08/2021 – Tail Dragger Information This section outlies the various elements that are used in the tail dragger configuration, that differ from the tricycle model. 8.4.1 Aircraft 3-View Drawing DIMENSIONS IN THESE DRAWINGS ARE IN MILLIMETRES.

  • Page 152: Pilot Controls

    Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information DIMENSIONS IN THIS DRAWING ARE IN MILLIMETRES. 8.4.2 Landing Gear Parameter / Item Value Wheel Track 2.14 m / 7 ft. 02 in. Wheelbase 5.11 m / 16 ft. 77 in.

  • Page 153: Weight And Balance

    Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.4.4 Weight and Balance 8.4.4.1 Centre of Gravity Arms 2170 1969 WARNING Aircraft CG and MAUW limitations must be adhered to at all times. NOTE • GC range is 1,969 mm (6.427 ft) to 2,170 mm (7.087 ft) aft of the reference datum (18% to 33% of MAC).
  • Page 154 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.4.4.2 CG Envelope Allowable CG Envelope 2502 1100 2302 1000 2102 FLIGHT ONLY PERMITTED IF 1902 INSIDE THE ENVELOPE 1702 1502 1302 1102 CG position [%MAC] WARNING Aircraft CG and MAUW limitations must be adhered to at all times.
  • Page 155 Pilot Operating Handbook Supplementary Information 8.4.4.3 Determination of CG Sling Aircraft makes use of a numerical method in calculating the CG of the aircraft. The following will be required to complete a CG check: Item Empty CG Value Blank CG Form...
  • Page 156 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information The aircraft’s empty CG is determined in a conventional manner, by weighing the aircraft whilst it is standing level. Refer to the Maintenance Manual for more. Maximum all up weight (MAUW) = 1,120 kg (2,469.17 lb) Maximum useful load (example): ��...
  • Page 157 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.4.4.4 Determination of Empty CG ITEM WEIGHT MOMENT [kg (lb)] [mm (ft)] (weight x arm) [kg.mm (lb.ft)] Right Main Wheel W = 1,527 (5.01) Left Main Wheel = 1,527 (5.01) Tail Wheel = 6,576 (21.57)
  • Page 158 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.4.4.5 Blank CG Form and Graph for Use Moment Weight (weight x arm) [kg (lb)] [mm (ft)] [kg.mm (lb.ft)] Crew [Front] 1 958 (6.39) Passengers [Rear] 2 941 (9.65) Baggage 3 448 (11.34)
  • Page 159 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Allowable CG Envelope 1100 2302 1000 2102 1902 1702 1502 1302 1102 CG position [%MAC] Warning Aircraft CG and MAUW limitations must be adhered to at all times. Document Number: DC-POH-001-X-G-2.0 Page | 8-14 Revision: 2.0...
  • Page 160 Limitations, procedures and information not addressed in this supplement remain as set out in Sling 4 HW Pilot Operating Handbook. For the purposes of this manual the main tanks will be referred to as ‘A tanks’ and the long- range tanks will be referred to as ‘B tanks’.
  • Page 161 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Document Number: DC-POH-001-X-G-2.0 Page | 8-16 Revision: 2.0 Date: 2025/01/28...
  • Page 162 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Item Description Left A Tank Right A tank Fuel Selector Facet Solid State Fuel Pump Left B tank Right B tank An6, 90 Bulkhead With Nut 3/8” Fuel Hose Aluminium 8.5.3...
  • Page 163 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.5.4 Effect on Aircraft CG For long-range tanks, an amendment is made to the standard blank CG form. The moment arm for long-range tanks, 1,949 mm, is added as shown in the table below.
  • Page 164 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Allowable CG Envelope 2502 1100 2302 1000 2102 1902 1702 1502 1302 1102 CG position [%MAC] Document Number: DC-POH-001-X-G-2.0 Page | 8-19 Revision: 2.0 Date: 2025/01/28...
  • Page 165 Sling 4 HW Pilot Operating Handbook. 8.6.1 Introduction A full hand control system may be optionally installed in the Sling 4 HW to allow pilots who have reduced/no functionality of the legs to pilot the aircraft in a safe manner.
  • Page 166 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.6.2 Installation of the hand control system The hand control system is mounted on the left-hand side of the aircraft and is connected alongside the standard control stick. The hand control system is mounted directly to the floor of the aircraft and is connected to the pedals (rudder control) via a pushrod.
  • Page 167 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.6.3 Operation of the hand control system 8.6.3.1 Rudder control Rudder control is achieved by pushing the hand control stick forwards and backwards. Pushing the lever forward/away from the pilot will result in a right yaw control input and pulling the lever back/towards the pilot will result in left yaw control input.
  • Page 168 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.6.3.4 The hand control stick has a PTT (push-to-talk) key, which is mounted atop the stick. To use this PTT key, press and hold the button during speech on the selected frequency.
  • Page 169 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information Supplement 02/2023 – MTV-6/190-69 This supplement must be contained in the Pilot Operating Handbook during operation of the airplane. Information contained in this supplement adds to or replaces information from the standard Pilot Operating Handbook with regard only to the specific sections addressed herein.
  • Page 170 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.7.3 Single Lever Control (RS Flight Systems) A single lever control system is created by combining the MTV-6 propellor system with the RS Flight Systems 9iS SCU. There is no interface for propellor control afforded to the pilot, as the control of the propellor happens internally in the single lever system.
  • Page 171 Information Supplement 08/2023 – Rotax 916 iS Engine The Rotax 916 iS engine may be fitted to the Sling 4 High Wing. This engine is a 4-stroke, turbocharged, 4-cylinder, horizontally opposed, spark ignition engine, with one central camshaft -pushrod OHV and a displacement of 1,352cc (1.35L/82.5 cubic inch).
  • Page 172 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.8.1.2 Engine Load Factor Limits (Acceleration) Item Value Maximum 5 seconds at maximum - 0.5g 8.8.1.3 Oil System Parameter / Item Value Oil System Type Forced with external oil reservoir.
  • Page 173 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.8.1.4 Engine Operational and Speed Limits Parameter Value Engine Model ROTAX 916 iS Engine Manufacturer Bombardier-Rotax GMBH 117kW / 160 hp at 5,800 rpm, Maximum take-off max. 5 minutes Power...
  • Page 174 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.8.1.5 Take-off Distances Surface Altitude Mass Run Distance 15m / 50 ft. Distance 1,120 kg 360 m / 1,180 ft 810 m / 2,657 ft 1,050kg 230 m / 755ft...
  • Page 175 ECO mode, which results in an approximate fuel consumption of 32 LPH in the cruise propeller setting. Cruise information for the Sling 4 HW is calculated using an 88% power setting at 5,000 RPM.
  • Page 176 Sling 4 HW Section 8 Pilot Operating Handbook Supplementary Information 8.8.1.9 Fuel Consumption Engine Power 100% MAX ECO Engine RPM 5,800 5,500 5,000 5,000 Fuel Burn 49.7 39.4 31.7 12.2 10.4 Endurance [hrs] Range [nm] 1,000 ft. Range [nm] 5,000 ft.

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