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Sportine Aviacija LAK-17 2015 Flight Manual

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Joint Stock Company "SPORTINĖ AVIACIJA ir Ko"
Pociūnų km., Ašmintos sen., LT-59327, Prienai, Republic of Lithuania
tel.: +370 319 60567 ● fax:+370 319 60568 ● e-mail: info@lak.lt ● www.lak.lt
Type:
Model:
Sales Designation:
Serial Number:
Registration:
Date of Issue:
It is a preliminary manual. The sailplane is not certified and has not shown
compliance with airworthiness requirements.
This sailplane is to be operated in compliance with the regulatory information and
This Manual should always be kept on board of the sailplane
FLIGHT MANUAL
For the
LAK-17BT sailplane
LAK-17
LAK-17BT
LAK-17BT from Serial No. ...........
_______________
_______________
_______________
limitations contained herein.

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  • Page 1 Joint Stock Company "SPORTINĖ AVIACIJA ir Ko" Pociūnų km., Ašmintos sen., LT-59327, Prienai, Republic of Lithuania tel.: +370 319 60567 ● fax:+370 319 60568 ● e-mail: info@lak.lt ● www.lak.lt FLIGHT MANUAL For the LAK-17BT sailplane Type: LAK-17 Model: LAK-17BT Sales Designation: LAK-17BT from Serial No.
  • Page 2 LAK-17BT Flight Manual...
  • Page 3 LAK-17BT Flight Manual Record of revisions Any revision of the present manual, except actual weighing data, must be recorded in the following table and in the case of approved Chapters, endorsed by the responsible airworthiness authority. The new or amended text in the revised page will be indicated by a black vertical line in the left hand margin, and the revision number and date will be shown on the bottom left hand of the page.
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  • Page 5 LAK-17BT Flight Manual List of effective pages Chapter Page Date of Issue Chapter Page Date of Issue 20 Apr. 2015 Appr. 4-2 20 Apr. 2015 20 Apr. 2015 Appr. 4-3 20 Apr. 2015 20 Apr. 2015 Appr. 4-4 20 Apr. 2015 20 Apr.
  • Page 6 LAK-17BT Flight Manual Continued Chapter Page Date of Issue Chapter Page Date of Issue 20 Apr. 2015 20 Apr. 2015 20 Apr. 2015 20 Apr. 2015 7-10 20 Apr. 2015 7-11 20 Apr. 2015 7-12 20 Apr. 2015 7-13 20 Apr. 2015 7-14 20 Apr.
  • Page 7 LAK-17BT Flight Manual Table of contents Chapter GENERAL (a non-approved chapter) .............. 1 LIMITATIONS (an approved chapter)............2 EMERGENCY PROCEDURES (an approved chapter)......... 3 NORMAL PROCEDURES (an approved chapter)......... 4 PERFORMANCE (a partly approved chapter)..........5 WEIGHT AND BALANCE / EQUIPMENT LIST (a non-approved chapter) ...................
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  • Page 9: Table Of Contents

    LAK-17BT Flight Manual Chapter 1 GENERAL Introduction ..................... 1-2 Certification basis ..................1-2 Warnings, cautions and notes ..............1-2 Descriptive data ..................1-3 Three-view drawing................. 1-6 Abbreviations ..................1-7 Unit conversion ..................1-7 Rev. No. 0 Date: 20 April 2015 Page 1-1...

  • Page 10: Introduction

    LAK-17BT Flight Manual Introduction The sailplane flight manual has been prepared to provide pilots and instructors with information for the safe and efficient operation of the LAK-17 BT self-sustaining sailplane. This manual includes the material required to be furnished to the pilot by CS-22.

  • Page 11: Descriptive Data

    LAK-17BT Flight Manual Descriptive data The LAK-17BT is a modification of the single seat high performance self- sustaining powered sailplane of FAI 15 m – 18 m class LAK-17AT designed according to CS-22, category “U” specifications. It is a mid-wing self-sustaining glider with flaps, T-tail, retractable main landing gear and water ballast tanks (see Table 1-1).
  • Page 12 LAK-17BT Flight Manual s [m] c [m] Airfoil 0,625 LAP7-131/17 LAP7-128/18 0,38 LAP7-128/19 8,855 0,226 LAP93/148 21 m 0,741 LAP7-150 0,711 LAP7-131/17 0,625 LAP7-131/17 6,812 LAP7-128/18 9,157 0,38 LAP7-128/19 10,408 0,226 LAP93/148 The cockpit is of monocoque construction. The manually controlled seat back and an adjustable head rest together with optimally arranged controls offer notable comfort for the long flights.
  • Page 13 LAK-17BT Flight Manual Table 1-3 15 m 18 m 21 m Wing span (49.2 ft) (59.06 ft) (68.89 ft) Fuselage length 6.555 m (21.5058 ft) Height 1.29 m (4.23 ft) 550 kg 600 kg 600 kg Max gross weight (1212.5 lbs) (1322.8 lbs) (1322.8 lbs) 0.6281 m...

  • Page 14: Three-View Drawing

    LAK-17BT Flight Manual Three-view drawing Rev. No. 0 Date: 20 April 2015 Page 1-6...

  • Page 15: Abbreviations

    LAK-17BT Flight Manual Abbreviations calibrated airspeed means indicated airspeed of a sailplane, corrected for position (due to position of pressure ports on sailplane) and instrument error. Calibrated airspeed is equal to true airspeed in standard atmosphere at sea level C.G. center of gravity decanewton hour...
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  • Page 17 LAK-17BT Flight Manual Chapter 2 LIMITATIONS Introduction ..................... 2-2 Airspeed....................2-2 Airspeed indicator markings..............2-4 Power-plant information and operation limitations ......... 2-4 2.4.1 Power-plant ..................2-5 2.4.2 Fuel tank and fuel................2-5 Mass (weight) ..................2-6 Center of gravity..................2-6 Approved maneuvers ................

  • Page 18: Introduction

    LAK-17BT Flight Manual Introduction Chapter 2 includes operation limitations, instrument markings and placards necessary for safe operation of the LAK-17BT self-sustaining powered sailplane, its engine, standard systems and standard equipment. The limitations have been approved. Compliance with these limitations is mandatory.
  • Page 19 LAK-17BT Flight Manual IAS [km/h / (kts)] Speed Remarks 15 m & 18 m & 21 m Do not exceed this speed except in smooth air and Rough air speed 190 / (102) then only with caution. Rough air is in lee wave rotor, thunderclouds, etc.

  • Page 20: Airspeed Indicator Markings

    LAK-17BT Flight Manual Select your power-plant extension/retraction speed *Warning: correctly:  Flaps must be at +2 position;  Make sure your selected speed for power-plant extension/retraction is at least 8…10 km/h (4…5 kts) higher than a stall speed for your flight configuration Airspeed indicator markings Airspeed indicator markings and their color code significance are shown in Table 2-2.

  • Page 21: Power-Plant Information And Operation Limitations

    LAK-17BT Flight Manual Power-plant information and operation limitations LAK-17BT is equipped with self-sustaining power-plant and is prohibited from taking-off solely. Therefore use of the power-plant has some limitations which need to be observed:  extend and retract engine only at the speed range V = 90…110 km/h (49…60 kts);...

  • Page 22: Mass (Weight)

    LAK-17BT Flight Manual Non useable amount of fuel: 0.3 ltr (0.1 US gal); Useable amount of fuel: 7.2 ltr (1.9 US gal) + optional 4.5 ltr (1.18 gal). Approved fuel grades: two stroke mix (gas/oil) – min 95 RON, AVGAS 100LL mixed at ratio 30:1 with two stroke oil Castrol Super TT.

  • Page 23: Approved Maneuvers

    LAK-17BT Flight Manual front limit (critical for the engine 206 mm aft of wing root rib leading edge extracted): rear limit (critical for the engine 328 mm aft of wing root rib leading edge retracted): For the glider with power plant installed and pilot weight less than 100 kg fin battery has to be removed.

  • Page 24: Kinds Of Operation

    LAK-17BT Flight Manual With these loads, the C.G. range given in 2.7 will be in the limits if the empty glider weight and C.G. is in the limits (see empty center of gravity chart in Chapter 6). Caution: With low pilot weight lead ballast must be added to the nose of the cockpit.

  • Page 25: Aero Tow, Winch And Auto Tow Launching

    LAK-17BT Flight Manual  cylinder head temperature indicator;  engine elapsed time indicator (counts engine hours);  rear view mirror;  outside air temperature (OAT) gauge (if water ballast is carried);  emergency locator transmitter (ELT) (if required by national regulations); ...

  • Page 26: Water Ballast

    LAK-17BT Flight Manual 2.13.2 Water ballast Filling of the wing water ballast tanks must result in the symmetrical loading condition only. After filling, balance the wings by dumping enough water from the heavy wing to achieve lateral balance. Flight with leaking water ballast is not permitted as this may result in asymmetrical loading.
  • Page 27 LAK-17BT Flight Manual m – Altitude – ft km/h – V , IAS – kts 4000 13100 275/220* 148/118* 5000 16400 260/205* 140/111* 6000 19680 245/190* 132/103* 8000 26250 220/165* 119/89* 10000 32800 195/140* 105/76*  Nose ballast limitations placard - located at a bulkhead at the nose of the glider (optional): Nose ballast Max permitted 6.0 kg (13.2 lbs)
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  • Page 29 LAK-17BT Flight Manual Chapter 3 EMERGENCY PROCEDURES Introduction ..................... 3-2 Canopy jettison ..................3-2 Bailing out ....................3-2 Stall recovery................... 3-3 Spin recovery................... 3-3 Spiral dive recovery................. 3-3 Engine failure ..................3-3 3.7.1 Power loss during flight ..............3-4 Fire......................3-4 3.8.1 Engine fire during flight ..............

  • Page 30: Introduction

    LAK-17BT Flight Manual Introduction Chapter 3 provides a checklist and explanations for coping with emergencies that may occur. Emergency situations can be minimized by proper pre-flight inspections and maintenance. Canopy jettison The following steps accomplish canopy jettison: Pull the red canopy jettison handle aft to the limit of its travel; Release the handle.

  • Page 31: Stall Recovery

    LAK-17BT Flight Manual Warning: If there is no time to stop the propeller and retract the engine try to avoid the engine and propeller by leaving the sailplane beneath the wing. Stall recovery Stall recovery is accomplished by easing the stick forward and if necessary picking up a dropping wing with sufficient opposite rudder.

  • Page 32: Power Loss During Flight

    LAK-17BT Flight Manual Warning: Stall speed will increase, fly faster. Glide ratio with the engine extended and stopped is degraded down to about 18 units and sink rate is approx. 1,8 m/s (355 ft./min). 3.7.1 Power loss during flight If power is lost during flight push the control stick forward immediately, watch the airspeed indicator! Check: ...

  • Page 33: Loss Of Electrical Power In Flight

    LAK-17BT Flight Manual Loss of electrical power in flight With the engine retracted:  continue flying as a sailplane. With the engine extended not running:  Even if electric power failed, in a case when engine is extracted, it is possible to start the engine.

  • Page 34: Recovery From Unintentional Cloud Flying

    LAK-17BT Flight Manual 3.11 Recovery from unintentional cloud flying At speeds below 190 km/h (102 kts), extend the dive brakes fully. At higher speeds, up to V , pull out the dive brakes very carefully and expect high aerodynamic forces and g-loads. Enter the descent and fly normally until leaving the cloud.

  • Page 35: Ditching Landing On Water

    LAK-17BT Flight Manual 3.15 Ditching landing on water Our experience shows that in ditching the cockpit area likely will be forced downward under water. Therefore an emergency landing on water is recommended only with the landing gear extended and then only as a last resort. Rev.
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  • Page 37 LAK-17BT Flight Manual Chapter 4 NORMAL PROCEDURES Introduction ..................... 4-2 Rigging and de-rigging, filling the water tanks, refueling ....... 4-2 4.2.1 Rigging and de-rigging................ 4-2 4.2.2 Filling the water tanks ................. 4-3 4.2.3 Refueling ..................... 4-4 Daily inspections ..................4-4 Pre-flight inspection ................

  • Page 38: Introduction

    LAK-17BT Flight Manual Introduction This chapter provides checklists and explanations of procedures for conducting normal operating procedures. Normal procedures associated with optional equipment can be found in Chapter 9. Rigging and de-rigging, filling the water tanks, refueling 4.2.1 Rigging and de-rigging The following procedures are recommended for rigging and de-rigging the LAK-17BT sailplane: Clean and lubricate all pins, bushings and control connections.

  • Page 39: Filling The Water Tanks

    LAK-17BT Flight Manual Install outer wing 15 m, or outer wing 18 m, or outer wing 21 m, lock and secure. To connect left and right winglets: screw bolt M5 into the wingtip/winglet fixator and pull it out until it reaches the stop. While holding fixator in lifted position, push the winglet completely into the wing.

  • Page 40: Refueling

    LAK-17BT Flight Manual Warning: allow tanks to vent while filling. Do not fill with pressure exceeding 1 psi / 0,06 bar as the structure could be damaged. Check for proper dump valves operation prior to flight. Do not exceed the maximum gross weights. 4.2.3 Refueling Preferably fuel is transferred from a can where the correct amount of oil is...
  • Page 41 LAK-17BT Flight Manual  operation of control systems: ailerons, flaps, elevator, rudder and airbrakes (confirm that air brakes lock when closed);  operation of pilot cockpit ventilation, seat back adjustment;  operation of a trimmer;  batteries and oxygen bottle for condition, properly secured; ...

  • Page 42: Pre-Flight Inspection

    LAK-17BT Flight Manual  functioning of de-compressor and propeller brake;  ignition system including wires and the spark plug connectors for tight fit;  engine retaining cable and its connections in the engine compartment and to the engine;  fuel lines, electrical wires, bowden cables and structural parts for wear and kinks;...

  • Page 43: Normal Procedures And Recommended Speeds

    LAK-17BT Flight Manual 10. Water ballast checked, dump valve closed and vents open. 11. Airbrakes closed and locked. 12. Trim set to take-off position. 13. Flaps set to take-off position. 14. Check wheel brake. 15. Altimeter set correctly. 16. Check direction of wind component. 17.

  • Page 44: Winch-Launch Or Auto-Tow

    LAK-17BT Flight Manual Warning: Aero-tow launches are only allowed at the aero-tow hook. When water tanks are partially filled, keep wings horizontal Warning: before take-off to avoid uneven water distribution. It is not allowed to take off with the engine extended. Warning: Weak link in tow cable: max 780 daN (1753 lbs).

  • Page 45: Free Flight

    LAK-17BT Flight Manual When water tanks are partially filled, keep wings horizontal Warning: before take-off to avoid uneven water distribution. Seat back must be properly fixed! Warning: Weak link in tow cable: max 780 daN (1753 lbs). Use wheel brake during tightening of tow cable to avoid rolling over tow cable.

  • Page 46: Cruise With Running Engine

    LAK-17BT Flight Manual With a forward C.G. position is a clear and distinct stall warning. The stall characteristics are very gentle and large aileron deflections can be applied without dropping the wing. At rearward C.G. positions airflow separation over the fuselage results in buffeting and gives warning to an impending stall.

  • Page 47: Extension And Starting/Restarting The Engine In Flight

    LAK-17BT Flight Manual Warning: Stall speed will increase, fly faster. Glide ratio with the engine extended and stopped is degraded down to about 18 units and sink rate is about 1.8 m/s (355 ft./min). Stall warning with extended engine is marginal and covered Caution: by the engine vibration.

  • Page 48: Stopping And Retracting The Engine In Flight

    LAK-17BT Flight Manual  Increase the speed to about 130…140 km/h (70 … 76 kts).  Release de-compressor. Engine should start. Warning: Always pay attention to the altitude! select your power-plant extension retraction speed correctly: *Warning:  flaps must be at +2 position; ...

  • Page 49: High Altitude Flights

    LAK-17BT Flight Manual Ground C temperature F 1200 2000 2700 4300 5800 Max. flight altitude 4000 6500 9000 14000 19000 Filling and dumping the water ballast: After filling the ballast tanks, either full or with partial loads, the wings should be leveled and checked for symmetrical loading. Flight with leaking ballast valves is prohibited.

  • Page 50: Engine Retraction On A Ground

    LAK-17BT Flight Manual Make sure propeller brake is on and ignition is off. Extract the engine: to extract the engine the switch on the right side of the MCU display has to be switched up to the “extract” position. First the door opens till the limit switch for opened door activates.
  • Page 51 LAK-17BT Flight Manual Chapter 5 PERFORMANCE Introduction ..................... 5-2 Data approved by EASA ................. 5-2 5.2.1 Airspeed indicator system calibration ..........5-2 5.2.2 Stall speeds..................5-3 Additional information ................5-3 5.3.1 Demonstrated crosswind components ..........5-3 5.3.2 Glide performance................5-3 5.3.3 Flight polar ..................

  • Page 52: Introduction

    LAK-17BT Flight Manual Introduction This Chapter provides EASA approved data for airspeed calibration, stall speeds and take-off performance and non-approved further information. The data in the charts have been computed from actual flight tests with the sailplane in good condition and using average piloting techniques. Data approved by EASA 5.2.1 Airspeed indicator system calibration...

  • Page 53: Stall Speeds

    LAK-17BT Flight Manual 5.2.2 Stall speeds Stall speeds for different sailplane configurations are shown in Table 5-1. Table 5-1 Stall speed in level flight, km/h (kts) Flap position with maximum take-off without water ballast weight 80 (43.2) 83 (44.8) 82 (44.2) 85 (45.9) 83 (44.8) 87 (47)

  • Page 54: Flight Polar

    LAK-17BT Flight Manual 5.3.3 Flight polar 5.3.4 Powered flight performance 5.3.4.1 Rate of climb Measured average rate of climb at MSL, standard atmosphere, flaps position “+2”, flying at a speed 95…100 km/h (51…54 kts) is:  2 m/s (395 ft./min) for maximum weight without water ballast; ...
  • Page 55 LAK-17BT Flight Manual Chapter 6 WEIGHT AND BALANCE / EQUIPMENT LIST Introduction ..................... 6-2 Weighing procedures................6-2 Weighing record ..................6-2 Empty weight and C.G................6-3 Calculation of C.G. position ..............6-5 Weight of all non-lifting parts ..............6-7 Maximum weight..................

  • Page 56: Introduction

    LAK-17BT Flight Manual Introduction This Chapter contains the payload range within which the sailplane can be safely operated. Procedures for weighing the sailplane and the calculation method for establishing the permitted payload range are also provided. A comprehensive list of all equipment available for this sailplane is contained in the Maintenance Manual.

  • Page 57: Empty Weight And C.g

    LAK-17BT Flight Manual Empty weight and C.G. Approved in flight C.G. positions are shown in Table 6-1. Table 6-1 Approved limit, Parameter In flight: Foremost position of C.G. (critical for power-plant extracted) Rearmost position of C.G. (critical for power-plant retracted) Warning: It is important to do weighing or calculation of C.G.
  • Page 58 LAK-17BT Flight Manual Empty weight of Date C.G. location Approved the sailplane [kg] [mm] Date Signature Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted: Engine retracted: Engine extracted:...

  • Page 59: Calculation Of C.g. Position

    LAK-17BT Flight Manual Warning: Fin battery has to be removed. Only the baggage compartment batteries can be installed. Due to flutter reasons it is not allowed to add additional Warning: masses to the fin battery or the fin battery compartment. Note: If pilot weight is 100…110 kg (220.5…242 lbs), it is possible to remove one baggage compartment battery and...
  • Page 60 LAK-17BT Flight Manual    , mm  where: – the glider component mass, kg; – distance between glider component mass C.G. and wing root leading edge, mm; distance is negative if mass C.G. is ahead of the wing root leading edge;...

  • Page 61: Weight Of All Non-Lifting Parts

    LAK-17BT Flight Manual Note: The glider empty weight and empty weight center of gravity are defined by weighing data. it is important to do weighing or calculation of c.g. for Warning: forward limit with engine extracted and for rear limit with engine retracted as engine position makes big influence for c.g.
  • Page 62 LAK-17BT Flight Manual Water ballast loading table The max permissible water ballast weight (kg) is given in the following tables. Table 6-4 Wing span: 21 m; sailplane maximum take-off mass: 600 kg Mass of Sailplane empty weight, kg +fin ballast weight, kg pilot with parachute [kg]...

  • Page 63: Determining Possible Loading Of The Glider

    LAK-17BT Flight Manual Table 6-6 Wing span: 15 m; sailplane maximum take-off mass: 550 kg Mass of Sailplane empty weight, kg +fin ballast weight, kg pilot with parachute [kg] Maximum capacity of inner wing tanks.....158 liter (41.7 US gal). Maximum capacity of outer wing tanks....30 liter (7.9 US gal). Maximum capacity of fin tank.......8 liter (2.11 US gal).
  • Page 64 LAK-17BT Flight Manual According to the “Water ballast loading table” – the max permissible wing water ballast weight is  185 kg. Rev. No. 0 Date: 20 April 2015 Page 6-10...
  • Page 65 LAK-17BT Flight Manual Chapter 7 SAILPLANE AND SYSTEMS DESCRIPTION Introduction ..................... 7-2 Airframe construction................7-2 Flight controls and trim ................7-4 Airbrakes and wheel brake ..............7-4 Flaps ......................7-5 Landing gear .................... 7-5 Tow release....................7-5 Canopy operation..................7-5 Water ballast system ................

  • Page 66: Introduction

    LAK-17BT Flight Manual Introduction This Chapter provides a description of the sailplane, its systems and provided standard equipment with instructions for use. Airframe construction The LAK-17BT is a single seat high performance self-sustaining sailplane designed to meet FAI 15 m, 18 m or open class requirements. The wings are constructed with glass and carbon fiber reinforced plastic over a plastic foam core with carbon rod spar caps.
  • Page 67 LAK-17BT Flight Manual Figure 7-1 Figure 7-2 Rev. No. 0 Date: 20 April 2015 Page 7-3...

  • Page 68: Flight Controls And Trim

    LAK-17BT Flight Manual Flight controls and trim The ailerons and elevator are operated from the central control column (control stick). The trim adjustment control knob is located in the left armrest and controls the elevator trim select position. See Maintenance Manual Section 2. To set the trim, simply move the adjustment knob to the desired trim position.

  • Page 69: Flaps

    LAK-17BT Flight Manual Flaps The flaps are operated by the gray control handle located on the left cockpit wall. For more information see Maintenance Manual Section 2. Landing gear The landing gear is extended and retracted with the gray control handle located in the right hand armrest. Landing gear locked positions are located at either end of the control handle travel.

  • Page 70: Water Ballast System

    LAK-17BT Flight Manual The canopy latching handles are black and are located on either side of the canopy frame. Pull the handles back to lock and push forward to un-lock. Never use the window opening to lift or lower the canopy.

  • Page 71: Seat Back Adjustment

    LAK-17BT Flight Manual 7.11 Seat back adjustment Seat back adjustment is accomplished by using the squeeze ring located on the left cockpit side. 7.12 Baggage compartment Hard objects cannot be carried in the baggage compartment without a suitably designed lashing or anchorage. The baggage compartment load must not exceed 7 kg (15.4 lbs).

  • Page 72: Emergency Locator Transmitter

    LAK-17BT Flight Manual Caution: Installation of the oxygen system (Aerox Oxygen, type C, D or M) must be accomplished by the aircraft manufacturer or by a certified aircraft mechanic, according to national rules and regulations. An authority aircraft inspector must approve the installation.

  • Page 73: Ilec Mcu (Motor Control Unit)

    LAK-17BT Flight Manual Fuel Valve controls handle – located right-side cockpit wall. 7.18 ILEC MCU (Motor Control Unit) MCU Operation The MCU was designed to improve safety of engine use. This important MCU function can only obtained when MCU is always (continuous) switched on when operating the engine.
  • Page 74 LAK-17BT Flight Manual Figure 7-3 Abbreviations Cylinder Head Temperature EEPROM Electrically Erasable Programmable Read Only Memory Liquid Crystal Display Light Emitting Diode Motor Control Unit Rotations Per Minute Power-up sequence After powering up, MCU activates for two seconds all LED outputs, the buzzer output and the "88888888"...
  • Page 75 LAK-17BT Flight Manual Table 7-1 Pos. Description Run display Engine off/cold Error example Rotations per RPM 5500 RPM----- RPM----- minute (RPM) – main page Cylinder head CHT----- CHT230C CHT275C temperature (blinking) (CHT) Fuel tank level FUEL 5L FUEL 5L FUEL --- Battery voltage BAT12.5V BAT12.5V...
  • Page 76 LAK-17BT Flight Manual Display Reason Possible Error reason SWITCH C Time overflow door Limit switch door closed, wiring, door close procedure relays, door engine, fuse, battery voltage…. In retracted engine position the Display shows the following moving text: ILEC MCU LAK17BT xxxxx Hy.yy Sz.zz Explanation: xxxxx: Serial number...
  • Page 77 LAK-17BT Flight Manual Reason Buzzer Display Remark Yellow 5800 ≤ RPM < 6500 (≥ 5 min) continuous (blinking) RPM on Red RPM MCU does not limit RPM ≥ 6500 continuous (blinking) blinking max. RPM! CHT ≥ 275 °C continuous – (blinking) Acknowledge by continuous...
  • Page 78 LAK-17BT Flight Manual Engine extract / retract To extract the engine the switch on the right side of the LCD display has to be switched to top. First the door opens till the limit switch for opened door activates. After this the engine extracts till the limit switch for engine is activated and then the door closes back.
  • Page 79 LAK-17BT Flight Manual Engine hours Engine hours are counted at RPM higher than 2000 and stored in non- volatile EEPROM. Calibration of fuel type Two stroke engines use a mix of oil and gasoline. The share of oil but also gasoline of different company influences the fuel level sensor.
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  • Page 81 LAK-17BT Flight Manual Chapter 8 SAILPLANE HANDLING, CARE AND MAINTENANCE Introduction ..................... 8-2 Inspection periods and maintenance ............8-2 Alterations and repairs................8-2 Tie down....................8-2 Sailplane trailer..................8-3 Ground handling ..................8-3 Cleaning....................8-3 Rev. No. 0 Date: 20 April 2015 Page 8-1...
  • Page 82 LAK-17BT Flight Manual Introduction This chapter contains the manufacturer's recommended procedures for proper handling and servicing of the sailplane. It also identifies certain inspection and maintenance activities, which are needed to retain performance and dependability. Inspection periods and maintenance The Instructions for Continued Airworthiness as provided in the LAK-17BT Maintenance Manual must be followed.
  • Page 83 LAK-17BT Flight Manual Sailplane trailer A sailplane of this quality and value should be transported and stored in a high quality enclosed trailer constructed of metal or fiber glass reinforced plastics. Proper ventilation and UV blocking characteristics should be provided. The wings should be supported as close as possible to the inner most root rib and again at a point one third from the wing tip.
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  • Page 85 LAK-17BT Flight Manual Chapter 9 SUPPLEMENTS There are no supplements Rev. No. 0 Date: 20 April 2015 Page 9-1...

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