Page 1 “SPORTINĖ AVIACIJA ir Ko” Pociūnų km., Ašmintos sen., LT-59327, Prienų raj., Lithuania Tel: +370-319-60567 Fax: +370-319-60568 E-mail: info@lak.lt http://www.lak.lt MAINTENANCE MANUAL FOR THE LAK-17B FES sailplane with Front Electric Sustainer system Type (Muster): LAK-17 Model (Baureihe): LAK-17B FES Serial Number: Registration: ______________...
Page 2 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES List of Effective Pages Section Page Date of issue Section Page Date of issue 2.4.2_01 6 December 2013 2 (Illustration) 6 December 2013 6 December 2013 2.4.4_01 6 December 2013 6 December 2013 2.4.4_02...
Page 3 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Section Page Date of issue Section Page Date of issue 3.4.3_02 6 December 2013 3 (Illustrations) 3.4.4._01 6 December 2013 3.4.7_01 6 December 2013 3.4.8_01 6 December 2013 6 December 2013 3.4.9_01 6 December 2013 3.4.10_0...
Page 4 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Record of revisions Any revision of the present Manual, except actual weighting data, must be recorded in the following table and in case of approved Sections endorsed by responsible airworthiness authority. The new or amended text in the revised page will be indicated by black vertical line in the left hand margin, and the Revision No.
Page 5 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Rev. Affected Affected Date of Date of Date of isue Approval Signature Section pages approval Inspection...
Page 6 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Rev. Affected Affected Date of Date of Date of isue Approval Signature Section pages approval Inspection...
Page 7 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Rev. Affected Affected Date of Date of Date of isue Approval Signature Section pages approval Inspection...
Page 8 LAK-17B FES MAINTENANCE MANUAL LAK-17B FES Rev. Affected Affected Date of Date of Date of isue Approval Signature Section pages approval Inspection...
Page 9 Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 1 General Page INTRODUCTION...........................2 WARNINGS, CAUTIONS AND NOTES....................2 DESCRIPTION OF SAILPLANE......................2 ABBREVIATIONS ..........................3 THREE VIEW DRAWING ........................4 Rev. No. 0 Date: 06 December, 2013...
Page 10 1.1 Introduction This Maintenance Manual contains information for pilots, technicians and mechanics about safe and proper maintenance of the LAK-17B FES sailplane with Front Electric Sustainer system. This information is given in accordance with requirements of CS 22.1529. 1.2 Warnings, cautions and notes The following definitions apply to warnings, cautions and notes used in this manual.
Page 11 Section LAK-17B FES MAINTENANCE MANUAL Page 3 Technical data b=15 m b=18 m Wing span 15 m (49,2 ft) 18 m (59,06 ft) Wing area, m 9,18 m (98,81 ft 10,32 m (111,08 ft Wing aspect ratio 24,51 31,39 Wing dihedral angle, degrees...
Page 12 Section LAK-17B FES MAINTENANCE MANUAL Page 4 1.5 Three view drawing Rev. No. 0 Date: 06 December, 2013...
Page 13: Table Of Contents
Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 2 Description of sailplane and systems Page INTRODUCTION ............................2 AIRFRAME CONSTRUCTION.........................2 2.2.1 ..............................2 2.2.2 .............................3 USELAGE 2.2.3 .............................3 ERTICAL TAIL 2.2.4 ..........................3 ORIZONTAL TAIL 2.2.5 .............................4 ANDING GEAR CONTROL SYSTEMS..........................4 2.3.1 ....................4 ILERONS AND FLAPS CONTROL SYSTEM 2.3.2...
Page 14: Introduction
Section LAK-17B FES MAINTENANCE MANUAL Page 2 2.1 Introduction In this section there is given description of sailplane aggregates, systems, equipment, tables and markings and information about proper sailplane maintenance. 2.2 Airframe construction 2.2.1 Wing Sailplane wings (fig.2.2.1_01, fig.2.2.1_02) made of composite materials consist of four parts: right inner wing (pos.
Page 15: Fuselage
Section LAK-17B FES MAINTENANCE MANUAL Page 3 covered with sealing tape. Mounting the seals must ensure the free movement of control surfaces. 2.2.2 Fuselage The sailplane fuselage (fig. 2.2.2_01, fig. 2.2.2_02) is made of composite materials, construction is monocoque. The fuselage is oval-shaped in section (fig. 2.2.2_02), slightly narrowing at top and turning into circle at the fuselage end part.
Page 16: Landing Gear
Section LAK-17B FES MAINTENANCE MANUAL Page 4 2.2.5 Landing gear The landing gear consists of a retractable main wheel (fig. 2.2.5_01, pos. 5) and fixed tail wheel (fig. 2.2.2_01, pos. 6). Landing gear main wheel type TOST 045100 with Simplex shoe brake (or BERINGER wheel with brake) is attached to metal girder (fig.
Page 17: An Elevator Control System
Section LAK-17B FES MAINTENANCE MANUAL Page 5 2.3.2 An elevator control system The elevator control system (fig. 2.3.2_01) consists of metal rods and bellcranks. In order to ensure rigidity the main rod in the fuselage is supported by guide rollers (pos. 5).
Page 18: Airbrakes Control System
Section LAK-17B FES MAINTENANCE MANUAL Page 6 2.3.5 Airbrakes control system The airbrakes control system (fig. 2.3.1_01, fig. 2.3.5_01, fig. 2.3.5_02) comprises the control handle (pos. 3), attached to the left side of a cockpit and rigid rods and bellcranks.
Page 19: Main Landing Gear Control System
Section LAK-17B FES MAINTENANCE MANUAL Page 7 2.3.8 Main landing gear control system The landing gear control system (fig. 2.2.5_01) controls retracting and releasing of the main wheel. It consists of a control rod (pos. 1) on the right side of cockpit , an intermediate rod (pos.
Page 20: Flight And Navigation Instruments
Keep FCU instrument power supply always switched on during motor run! Instrument indications The FCU instrument for LAK-17B FES sailplane has on its front side three LED showing the most important states of the system during all operation time. Additional a LCD display Date: 06 December, 2013 Rev.
Page 21 Section LAK-17B FES MAINTENANCE MANUAL Page 9 gives more detailed information about the same states and other values. On the front side are also “ON/OFF” main FCU switch and THROTTLE /BRAKE/RESET button. On the back side are connectors. FES control unit instrument ON –...
Page 22: Electric And Radio Equipment
FES battery packs are located in the FES battery box (fig.2.5.1_01). LAK-17B FES two battery packs are wired in serial. One battery pack has 14 cells, so altogether 28 cells. Nominal capacity of each cell is 40Ah, at middle voltage 3,7V (minimum 3,2V, maximum 4,2V).
Page 23: Canopy Ventilation System
Section LAK-17B FES MAINTENANCE MANUAL Page 11 If FES was used during flight, take batteries out for recharging. Caution: -always turn off FCU instrument and all other instruments (Flight computer, Flarm, Radio, Transponder, PDA), before removing Power fuse; -always remove Power fuse before removing + or – supply cable! -immediately put safety covers on battery terminals to avoid potential short circuit;...
Page 24: Cockpit Equipment
Section LAK-17B FES MAINTENANCE MANUAL Page 12 of the air stream turns and touches the support (pos. 9.1) with its end part and detaches from the fuselage finally. The pin (pos. 9.2) does not allow the canopy to slide aside.
Page 25: Batteries
2.5.3 Batteries The batteries packs is shown at fig.2.5.3_01. LAK-17B FES has two batteries packs wired in serial. One battery pack has 14 cells, so altogether 28 cells. Nominal capacity of each cell is 40Ah, at middle voltage 3,7V (minimum 3,2V, maximum 4,2V).
Page 26: Data For Rigging
Section LAK-17B FES MAINTENANCE MANUAL Page 14 Layout of placards inside the sailplane is shown in fig. 2.6_01. 2.7 Data for rigging 2.7.1 Allowed clearances in connections of aggregates Allowed clearances of connection of sailplane aggregates are given in fig.2.7.1_01 and fig.2.7.1_02.
Page 27: Allowed Forces In Control Systems
Section LAK-17B FES MAINTENANCE MANUAL Page 15 2.7.3 Allowed forces in control systems Allowed forces in control systems are given in table 2-4. Forces are measured by checked dynamometers. Note: force of an elevator control system is measured with trimmer control handle in neutral position.
Page 70 1.Landing gear extended 2.Landing gear retracted 3.Water ballast closed 4.Water ballast opened 5.Tow release 6.Negative flaps position 7.Positive flaps position 8.Trimmer in pitching position 9.Trimmer in diving position 10.Pedals adjustment 11. Cockpit ventilation Fig.2.6_02. Placards and marking of controls...
Page 71  Wind direction Check list for powered flight  Batteries voltage checked  FES installation checked 19. Table of operational limitations LAK-17B FES 15/18*m - AIR SPEED DATA & LOADING PLACARD Speed IAS: km/h Masses and loads Never exceed Max mass with water ballast...
Page 72 20. Baggage limitation table Max baggage weight 7 kg (15,4 lbs) 21. Table of main wheel tyre pressure Pressure in a main wheel tyre from 2,3 to 2,5 bar 22. Table of tail wheel tyre pressure Pressure in a tail wheel tyre from 1,8 to 2,0 bar 23.
Page 73 28. Motor start / /stop Motor start  Turn ON FCU instrument.  Turn on Power Switch  Ventilation is OPEN  Check if there is green LED, check Voltage level  Start motor with Throttle knob rotating in clockwise direction gently.
Page 74 30. Instruction placard inside of battery compartment 31. Battery pack instruction placard 32. Batteries charge 33. Battery fuses 34. Nose ballast (optional) Nose ballast max. permitted 6 kg (13.2 lbs) Reduction of the Lead weight min. cockpit load by: required 5 kg (11 lbs) 2,0 kg (4,4 lbs) 10 kg (22 lbs)
Page 77 Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 3 Sailplane maintenance Page SAILPLANE CURRENT MAINTENANCE..................1 3.1.1 ..........................1 AILY INSPECTION 3.1.2 ........................2 OST FLIGHT INSPECTION 3.1.3 ..........................2 ROUND HANDLING 3.1.4 ......................3 TORING AND TRANSPORTATION 3.1.5 ......................3 LEANING AND KEEPING CLEAN..3.1.6 ....................3...
Page 78: Post Flight Inspection
Section LAK-17B FES MAINTENANCE MANUAL Page 2 operation of the trimmer, operation of flight instruments, radio communication, safety belts. 3. Check the main wheel tire and operation of wheel brake. 4. Check the left wing: upper and lower wing surfaces,...
Page 79: Storing And Transportation
Section LAK-17B FES MAINTENANCE MANUAL Page 3 Ground-towing the sailplane is to be ground-towed by a car with a special rope ~ 10 m of length having metal rings, the end of the rope with rings is to be attached to towing hook,...
Page 80 Section LAK-17B FES MAINTENANCE MANUAL Page 4 that pins in control shafts of ailerons and flaps and in control shafts of airbrakes and water ballast (pos. 7, 8, 9) turn at an angle which coincide with cuttings of corresponding shafts end in the wing, thus control of ailerons, flaps, airbrakes and water ballast in the left wing connects automatically.
Page 81: Lubrication System
Section LAK-17B FES MAINTENANCE MANUAL Page 5 hold the winglets reliably not allowing any movement. If the winglets move or the slot between outer wings in their coverings connection place has increased separate the ends, find out the reason and eliminate it.
Page 82: Adjustment
Section LAK-17B FES MAINTENANCE MANUAL Page 6 12. Main landing gear. 13. Tail wheel. 14. Propeller blades attachment point. When re-lubricating, clean old oil or grease before applying new. 3.3 Adjustment 3.3.1 Adjustment of airbrakes If airbrake (fig. 3.3.1_01, pos. 1) extension occurs unexpectedly in flight it is necessary to tighten the springs of the lids (pos.
Page 83: Adjustment Of Rudder Control System
Section LAK-17B FES MAINTENANCE MANUAL Page 7 3.3.4 Adjustment of rudder control system Adjustment of cables (fig. 2.3.4_01, fig. 2.3.4_02). Control cables (pos. 4) are adjusted by help of turnbuckles (pos. 3) (zone A). Allowed turns out for each turnbuckle end –no more than 3 thread turns.
Page 84: D E - Rigging And Rigging Of A Flap
Note: outer wing aileron control rod is optional. Basic models of LAK-17B FES has no control rod and the ailerons are connected to the inner wing automatically. 3.4.2 De-rigging and rigging of a flap De-rigging of flap (see fig.
Page 85: D E - Rigging And Rigging Of A Trimmer
Section LAK-17B FES MAINTENANCE MANUAL Page 9 pull out hinge pins (pos. 1). 2. Operations used for rigging of an elevator: fit the elevator into the hinge brackets, push through the hinge pins (pos. 1), put on washers (pos. 2), lock the hinge pins with wire split pins (pos.
Page 86: Removal And Installation Of Tail Wheel
Section LAK-17B FES MAINTENANCE MANUAL Page 10 3.4.8 Removal and installation of tail wheel To remove the tail wheel (fig. 3.4.8_01) do these operations: unbend edges of the lock washer (pos. 1) from surfaces of the hub (pos. 2) and the bolt (pos.3),...
Page 87: Removing And Installing The Motor
Section LAK-17B FES MAINTENANCE MANUAL Page 11 13 Firmly grip the rear battery by a carrier strap and slide it forward along the bottom of the battery compartment 14 Lift the battery pack out of the fuselage and put it on safe place 15 Close cover.
Page 88: Mounting And Removal Of The Propeller
Section LAK-17B FES MAINTENANCE MANUAL Page 12 3.Make sure that power cables are connected in the same order A, B, C like before and use only new M6 self-locking nuts. Make sure that there is no contact between cables and aluminum mounting wall.
Page 109 Section Page 1 LAK-17B FES MAINTENANCE MANUAL SECTION 4 Maintenance of the sailplane instruments and equipment according to their own maintenance documents INTRODUCTION............................1 LIST OF THE SAILPLANE INSTRUMENTS AND EQUIPMENT WHICH ARE SERVICED ACCORDING TO THEIR OWN MAINTENANCE DOCUMENTS ..............1 4.1 Introduction...
Page 110 Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 5 Periodical inspections Page INTRODUCTION .............................1 SAILPLANE INSPECTION PERIODS ......................1 INSPECTION AFTER EVERY 100 FLIGHT HOURS.................1 ANNUAL INSPECTION...........................5 INSPECTION AFTER ROUGH LANDING, AFTER GROUND LOOP ............5 RECOMMENDATIONS FOR EXTENDED STORAGE ................5 INSPECTION OF THE SAILPLANE AFTER EVERY 1000 FLIGHT HOURS ........6 5.1 Introduction...
Page 111 Section LAK-17B FES MAINTENANCE MANUAL Page 2 Inspection after every 100 flight hours Date……………….. Conformity Checking Signature Yes / No Sailplane weight, instruments in the instrument panel list and its’ weights revision Sailplane instruments and equipment which are serviced according to their own maintenance documents revision...
Page 112 Section LAK-17B FES MAINTENANCE MANUAL Page 3 Inspection after every 100 flight hours Date Conformity Checking Signature Yes / No Stabilizer hubs Elevator, its hinges, pins, clearances of the elevator, control connections Elevator and stabilizer connection state Rudder Surfaces of rudder ( paint, cracks) condition...
Page 113 Section LAK-17B FES MAINTENANCE MANUAL Page 4 Inspection after every 100 flight hours Date……………….. Conformity Checking Signature Yes / No Microphone, loudspeaker installation, operation Towing hook state, its life time according maintenance documents, springs, control cables Pilot harness restraint system, its life time according...
Page 114 Section LAK-17B FES MAINTENANCE MANUAL Page 5 Inspection after every 100 flight hours Date Conformity Checking Signature Yes / No 1103 Jobs according airworthiness and technical bulletins revision 1104 Sailplane log-book records revision 1105 1106 5.4 Annual inspection It is necessary to check the sailplane every 12 months in accordance with the 100 flight hours inspection.
Page 115 Section LAK-17B FES MAINTENANCE MANUAL Page 6 5. Remove FES batteries boxes, and store them at dry place at room temperature. The best storage voltage is 3.7V per cell (cca 52V per pack, or cca 104V on FCU total voltage measurement).
Page 116 Section LAK-17B FES MAINTENANCE MANUAL Page 7 rudder control (measure in upper point of pedals) – 2 … 2.5 daN, adjustment of pedals according to pilot height – 15 daN, airbrakes control: at opening – 15 daN, at closing - 18 daN, ventilation control –...
Page 117 Section LAK-17B FES MAINTENANCE MANUAL Page 8 Figure 5.7_01. The wing spar 15. To check external surfaces of wings, ailerons, flaps, fuselage, stabilizer, elevators and rudder. The special attention zones: the surfaces around hinge joints of control unit of elevators on the horizontal tail: Rev.
Page 118 Section LAK-17B FES MAINTENANCE MANUAL Page 9 the glued zones of the vertical tail spar onto the upper fin part: the elevator root rib: Special attention in external surfaces connection zones of elevators to control system. Rev. No. 0 Date: 06 December, 2013...
Page 119 Section LAK-17B FES MAINTENANCE MANUAL Page 10 the fuselage bulkhead: In zones where paint has cracks it is necessary to clean off the paint and check glass fiber reinforced plastic for cracks and if necessary to repair the damage. Initial clean off of paint shall be done with glass-paper No 180, No 220 finishing with No 320 or even finer.
Page 120 Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 6 The sailplane life limits Service life of sailplane is 6000 flight hours. The following FES system parts have limited service life: - refer to the current release of the manual for each FES component for service life limits.
Page 121 Section Page 1 LAK-17B FES MAINTENANCE MANUAL SECTION 7 Weights and center of gravity Page INTRODUCTION...........................1 DEFINITION OF SAILPLANE WEIGHT AND C.G................2 WEIGHT OF NON-LIFTING PARTS OF THE SAILPLANE.............3 CHECKING OF CONTROL WEIGHTS AND BALANCING .............3 CALCULATION OF LOADING LIMITS.....................4 7.1 Introduction...
Page 122 Section Page 2 LAK-17B FES MAINTENANCE MANUAL The maximum approved take-off and landing weight is 550 kg (1212,5 lbs) for 15m wing and 600 kg (1322,8 lbs) for 18m wing. Min pilot weight - see cockpit loading placard. Max pilot weight -110 kg.
Page 123 Section Page 3 LAK-17B FES MAINTENANCE MANUAL 3. To place sailplane tail on weighing-machine. To position the sailplane with help of an auxiliary equipment according to requirements of fig. 7.1_01. To seat a pilot into a cockpit, if C.G. with pilot is being defined.
Page 124 2.5 ÷3.25 50 ÷ 90 If weight of a control and static moment are not within the approved tolerances, contact the company “Sportin Aviacija”. 7.5 Calculation of loading limits Center of gravity position after loading glider ( additional instruments, equipment, water ballast, pilot) is defined by ∑...
Page 125 Section Page 5 LAK-17B FES MAINTENANCE MANUAL Component Weight Distance from DP Moment =Weight *Distance; G kg * mm Empty glider Pilot Battery in fin 4192 Battery in baggage compartment Water ballast in wings Water ballast in fin 4003 Instrument N1 in instrument panel...
Page 128 Section LAK-17B FES MAINTENANCE MANUAL Page 1 SECTION 8 Repair Page INTRODUCTION...........................2 MAIN REQUIREMENTS FOR REPAIR WORK.................2 REPAIR OF PARTS OF ADVANCED COMPOSITES................2 8.3.1 ......................2 ONDITIONS FOR REPAIR WORKS 8.3.2 .........................2 LASSIFICATION OF DAMAGE 8.3.3 ................3 YPICAL REPAIR OF SAILPLANE AGGREGATES SKINS 8.3.4...
Page 129 Section LAK-17B FES MAINTENANCE MANUAL Page 2 8.1 Introduction General requirements for repair of minor sailplane damage are given in this section. Repair of minor FES demages are described in separate FES maintenance manual. 8.2 Main requirements for repair work 1.
Page 130 Section LAK-17B FES MAINTENANCE MANUAL Page 3 It is allowed to repair these constructive damages in the certified repair station: 1) composite material delamination, cracks at structural joints, 2) damage of wing roots and end ribs, 3) cracks and fractures of metal constructions, 4) cracks and delamination of skins of fuselage, wings, stabilizer, controls, wings tips and damages in a structural parts.
Page 131 Section LAK-17B FES MAINTENANCE MANUAL Page 4 Type Weaving Mass Cloth Manufacturer (Interglass No) type g/m2 thickness, mm 98131 Twill 2/2 Interglass AG 98151 Twill 2/2 0.35 Interglass AG Plain 0.15 C. Cramer & Co Kevlar fabric 98613 Twill 1/3 0.35...

Sportine Aviacija LAK-17B FES Maintenance Manual

Maintenance Manual Page 1 2 Section 2 Description of Sailplane and Systems

Introduction

Airframe Construction

Control Systems

Equipment and Systems

Fes System

Placards and Marking of Controls

Data for Rigging

Illustrations

Sailplane Current Maintenance

3.1 Sailplane Current Maintenance

Lubrication System

Adjustment

Rigging and Rigging of Sailplane Parts

Illustrations

Quick Links

Chapters

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