DOVA Aircraft® DV-1 Skylark – Maintenance Manual v3.0

engine bed welded from steel rods. The engine compartment is covered with two fiberglass cowlings (lower and upper). Both DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 10 cowlings are one-sided painted to match the aircra; and are removable. The upper cowling is amached with cam locks. Fuel System: Two integral fuel tanks are mounted in the wings, each with a 45L volume. They are constructed from riveted and sealed duralumin sheets. Each fuel tank is equipped with a filling intake, outlet valve, sludge valve, air-bleeding valve, and a fuel meter. The fuel system itself includes a three-way fuel valve, fuel filters, and an electrical fuel pump. Interior: The aircra; features two upholstered seats placed side-by-side. Each seat’s posiQon is adjustable and secured with a posiQon lock. AddiQonal equipment includes four-point safety belts, a baggage compartment located behind the seats, and a safety net for securing luggage. Canopy: The canopy consists of a single piece of organic glass, riveted and glued to a welded frame made from duralumin tubes. It opens with a forward sliding movement and is amached to the fuselage via a metal pull-out system. The canopy latch is posiQoned at the top and can be locked. Ven2la2on System: VenQlaQon is provided through a rounded valve in front of the canopy. AddiQonally, side sliding windows are available as an opQon. Electrical Installa2on: The electrical system operates on a single-phase 12V system with the negaQve pole grounded. It relies on a duty-free bamery and an engine alternator as the power source. Each electrical circuit is protected by a fuse or circuit breaker located on the instrument panel. Labels: DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 11 A ready-to-fly aircra; delivered from the manufacturer comes equipped with the necessary labels. In the case of a kit, the owner must place the labels in their correct posiQons. It’s important to note that the owner is responsible for ensuring the label’s readability throughout the aircra;’s lifeQme. Instruments: The minimal instrument equipment includes: In-flight instruments: airspeed indicator, alQmeter, verQcal speed indicator, slip-ball indicator, compass, and fuel gauges. Engine instruments: tachometer, oil temperature indicator, engine head temperature indicator, and oil pressure indicator. Other opQonal instruments include the ICOM 200 radio, Ray Allen T10A servo for elevator trim, fuel pressure indicator, manifold pressure indicator, GPS AvMap EKP IV, Garmin transponder, arQficial horizon, and a 100W landing light. Signal Lights: PosiQon lights are placed in the winglets, and there are strobe lights (two on each winglet and two on the fuselage). Addi2onal Equipment: The aircra; is already prepared for the installaQon of ballisQc rescue systems. DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 12 2.0 Aircra> Overview Front, side and back views of the DOVA DV1 Skylark DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 13 DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 14 2.1 Basic dimensions FUSELAGE Length 6.62 m Width 1.09 m Height 2.28 m WINGS Wingspan 8.14 m Wing surface 9.44 m2 EMPENNAGE Horizontal tail surface 1.47 m2 Vertical tail surface 1.02 m2 UNDERCARRIAGE Track 1.70 m Wheelbase 1.36 m 2.2 Weights and performances: Empty weight 315 Kg MTOW 600 Kg Baggage 20 Kg Min. pilot weight 60 Kg Max. pilot weight 120 Kg COG position Front 21% SAT COG position Rear 36% SAT Mass m=370 kg m=600 kg Without flaps VS1 75 km/h 80 km/h Landing configuration VS0 65 km/h 73 km/h Uncertified ceiling 3650 m 12 000 feet DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 15 2.3 Fuel consump2on Values for Rotax 912 ULS – please refer to the official Rotax operating and maintenance manual for additional information. 5500 rpm (performance cruise) 22 liters / h 5000 rpm (regular cruise) 20 liters / h 4300 rpm (economy cruise) 16 liters / h 2.4 Engine life2me Term of engine overhaul is given as 2000 flight hours or 10 years for ROTAX 912 UL/S(first reached is valuable). See Rotax BulleQns – operaQonal condiQon of engine manufacturer 2.5 Engine parts with restricted life2me Have to be changed every 5 years: • air supplying hose for carburetors (AIRBOX) • all rubber hoses of cooling circuit • all rubber hoses of oil circuit • carburetors flange • rubber hoses connecting carburetors • belt attaching alternator • fuel pump including fuel hoses Have to be changed every 2 years: • cooling liquid of engine DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 16 2.6 List of parts with restricted life2me – structural : lifetime for changing parts of structural joint will be estimated by manufacturer, alternatively authorized service center during estimated inspections. In case that you will find any sign of rising wear of parts, higher friction or backlashes during your pre/after flight check, call authorized service center. – flight, navigation and engine instruments: DV-1 SKYLARK is equipped with following instruments ITEM NB OVERHAUL CONDITIONS DATE DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 17 2.8 Instrument Panel ConfiguraQons may vary. The aircra; owner is responsible for ensuring the content of the POH is aligned to the current configuraQon of the aircra;. Item Descrip2on Item Descrip2on 01 RAM Mount 14 Flaps actuator 02 RPM Gauge 15 Fuse panel 03 Horizontal Compass 16 Choke control 04 Airspeed indicator 17 Hot cabin control 05 AVMAP Ultra EFIS 18 CHT Gauge 06 Slip indicator 19 Oil Temperature 07 VSI 20 Le; fuel quanQty 08 AlQtude (hPa) 21 Oil Pressure 09 Trig Radio 22 Right fuel quanQty DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 18 10 Trig Transponder 23 Hobbs meter 11 Thromle 24 Fuel pressure 12 Elevator Trim Indicator 25 Audio jack plugs 13 Fuel valve selector 2.92 Fuse Box In case of electrical malfunction of on-board instrumentation, remove the relevant fuse by turning it counter-clockwise. This will disable the current flow from/to the selected system. DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 19 3.0 Basic handling 3.1 Ground handling During handling (hold/push/pull) aircra;s parts always touch in place of structural reinforcement, like ribs, wall and beams (shortly in posiQons of rivets lines). Do not touch fiberglass parts, neither control surfaces. The aircra; can be pushed/pulled only through: - Propeller and only in case of holding it as close to its cone as possible - Step-on surface on wings - Eventually though fuselage in place of its walls In case of parking outside the hangar, use wing’s anchors and fuselage strut to fix aircra; movement For easy movement on the ground, the aircra; is equipped by hangers on sides of fork of front undercarriage leg. So you can pull/push aircra; through towing rod. 3.2 Pre-flight inspec2on, maintenance Remove all covers, disconnect anchors (in case of parking aircra; outside of hangar) and block the wheels. DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 20 AIRCRAFT WALK-AROUND 1. RAM-AIR intake………………………………………………………………FREE 2. OIL Level………………………………………………………………………CHECK 3. PROPELLER ……………………………………………..SPIN (for OIL check) 4. OIL Level…………………………………….CHECK (after propeller spin) 5. Pitot cover ……………………………………………………………….REMOVE 6. L Aileron movement……………………………………………………….FREE 7. L Flap …………………………………………………………………………..CHECK 8. L tire pressure ……………………………………………………………..CHECK 9. XPDR Antenna …………………………………………………………….CHECK 10. Vertical stabilizer …………………………………………………………CHECK 11. Horizontal stabilizer……………………………………………………..CHECK 12. Trim Tab………………………………………………………………….NEUTRAL 13. Rudder controls……………………………………………………………CHECK 14. Radio Antenna …………………………………………………………….CHECK DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 21 15. R tire pressure …………………………………………………………….CHECK 16. R Flap…………………………………………………………………………..CHECK 17. R Aileron movement……………………………………………………….FREE 18. R Wing leading edge…………………………………………………….CHECK FUEL CHECK 1. Fuel quantity R/L TANK………………………………………………..CHECK 2. Fuel sample R/L TANK ….……………………………………………..CHECK 3. Fuel cap R/L TANK …………………………………………………….LOCKED ALSO CHECK THE INDICATED FUEL LEVEL IN THE COCKPIT MATCHES THE ACTUAL FUEL QUANTITY IN BOTH TANKS. 3.3 (Dis) Assembling of wings Warning: (Dis) Assemble aircra; always on place with enough space to safely manipulate with the parts or with whole aircra;. In case of disassembling aircra;, be sure that you have enough right pads (so;, clean, height enough) to protect the wing from damage during storage (on ground for ex.). During handling (hold/push/pull) aircra; parts always touch in pace of structural reinforcement like ribs, wall and beams (shortly in posiQons of rivets lines). Two individuals are required at minimum to (dis) assemble the wing safely. Always keep all disassembled parts, joining materials and others aircra;s items. Used self-locking nuts must be replaced with new ones! DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 22 Disassembling of wings • remove the covers inside the pilots cabin (flap control handle, under pilot, around the steering) • disconnect aileron control rod from the steering joystick • disconnect and blind fuel hoses from the wing-fuselage connection • disconnect the pitot-static hoses in left wing connection – first mark the hoses with static pressure and then disconnect to prevent wrong re-connection . Blind disconnected hoses to prevent getting dirty inside • after each re-assembling check proper pitot-static hoses connection and verify function • disconnect electro-installation connectors from wing to fuselage • remove self-locking nuts with washers from wing hinges on main and rear beam. (6+6 peaces on main, 2+2 peaces on rear one) • remove bolts from rear hinges, remove bolts from main hinges except 1+1 in upper hinges and except 1+1 in lower hinges • one man holds the end of the wing and second one remove upper and lower bolts (little up and down movement of wings end is required to release the bolts) • one man holds the end and second one holds the wing root attachment. Move the wing slowly out of the fuselage. During moving out, watch carefully the rod ball- ends, hoses, connectors to avoid their damaging from edges. During moving wing out, automatic disconnection of flap control happened, so it is better to hold the flap position during that act. • Put the wing carefully on suitable pad ( watch out for the pitot-static tube under the wing – has to be lifted) • Same procedure for opposite wing DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 23 Assembling of wings • Assembling means reverse procedure of disassembling • During assembling it is required to connect the flap controls properly. For that it is needed to set 0 positions on control flap handle and 0 positions on flap itself (that means trailing edge in straight line). With that the flap control will re-connect automatically. 3.4 (Dis) Assembling of tail surfaces Disassembling horizontal tail surfaces • remove fiberglass covers from stabilizer • disconnect connectors for trim control and strobe lights in front cavity • disconnect elevator control in rear cavity • remove self-locking nuts, washers and 4 bolts connecting stabilizer together with fin. • Remove horizontal tail surfaces and put it on suitable pad Assembling of horizontal tail surfaces Assembling consists of the reverse operaQon of the instrucQons menQoned above. 3.5 (Dis) Assembling of engines cowling • Disassembling of upper engine cowling requires just releasing cam-locks fasteners and removing two screws in front of the cowlings – close to the propeller nose. Removing of this cowling for the pre/after flight check of the engines compartment is required. Removing creates easy access to check level of engines liquids like oil and cooling liquid. • Disassembling of lower part of the cowlings requires disconnecting vent hoses from Naca’s inlets and removing DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 24 of bolts connecting cowling with firewall. It is required to start removing bolts from lower one and then move up to next ones. Removing will create easy access to exhausts pipe system, coolers, temperatures and oil sensors. Assembling consists of the reverse operaQon of the instrucQons menQoned above. DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 25 3.6 Estimating aircraft weight and center of gravity: Center of gravity posi2on: T = ( X * ( M2+M3)/(M1+M2+M3) – Y – 119 ) / 11,9 (% mac) Examples of C.G. position for Aircraft with BRS 1. Empty Fuel (liters) 0 LeC Pilot (kg) 0 Right Pilot (kg) 0 C.G. posi2on (%mac) 13.5% Weight (kg) 315 DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 26 2. With pilot 86 kg Fuel (liters) 0 LeC Pilot (kg) 86 Right Pilot (kg) 0 C.G. posi2on (%mac) 25% Weight (kg) 401 3. With pilot 60 kg Fuel (liters) 0 LeC Pilot (kg) 60 Right Pilot (kg) 0 C.G. posi2on (%mac) 22% Weight (kg) 375 4. With 2 pilots 86+47 kg + 20 kg baggage Fuel (liters) 0 LeC Pilot (kg) 86 Right Pilot (kg) 47 Baggage (kg) 20 C.G. posi2on (%mac) 35% Weight (kg) 468 5. With two pilots of 86 kg Fuel (liters) 0 LeC Pilot (kg) 86 Right Pilot (kg) 86 Baggage (kg) 0 C.G. posi2on (%mac) 32% DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 27 Weight (kg) 487 3.7 Opera2onal values: InformaQon bellow is not complete. Complete informaQon can be found in Original ROTAX 912 engines manual. The recommendaQons in the Rotax engine manual are to be followed. Oil pressure max. 7 bar min. 0,8 bar normal 2-5bar Oil temperature min. 50°C, max. 130° normal 90-110°C CHT max. 135°C Exhaust Gas Temperature max. 880°C –start max. 850°C – flight normal 800°C Fuel Pressure max. 0,4 bar normal 0,15-0,4 bar RPM RPM idling 1650 rpm Maximum Continuous: 5500 rpm Maximum for 5 minutes: 5800 rpm 3.8 Control Deflec2ons AILERONS Up 15° ± 1o Down 10° ± 1o FLAPS Position -1 -10° ± 2o Position 0 0 Position 1 +10° ± 2o Position 2 +21° ± 2o DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 28 Position 3 +40° ± 2o ELEVATOR Up 30° ± 2o Down 20° ± 2° RUDDER Right 30° ± 2o Left 30° ± 2o DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 29 4.0 Maintenance 4.1 General Flight and operaQonal eligibility directly depend on complying with scheduled maintenance intervals and degree. Proper maintenance service considers factors such as weather, hangar quality, airfield surface, and other relevant condiQons. This manual provides informaQon for maintenance and operaQon under average standard condiQons typical for this category. 4.2 Maintenance List with Terms CauQon: The intervals for engine inspecQons and the corresponding work are detailed in the Maintenance Manual (Line Maintenance) for the installed engine. Similarly, the propeller inspecQon intervals and associated tasks are specified in the Technical DescripQon and OperaQon InstrucQons for the installed propeller. If a periodical inspecQon occurs before reaching the specified Qme interval, the subsequent inspecQon must be performed no later than the specified Qme interval from the iniQal inspecQon (e.g., if the first 100-hour inspecQon occurs a;er 87 flight hours, the next 100-hour inspecQon must occur no later than 187 flight hours). The maintenance system comprises periodic inspecQons that must occur at least within the following intervals: a) Pre-flight inspec2on: Conducted within the scope outlined in the Flight Manual. b) Propeller inspec2on: A;er the first 5, 20, and 50 flight hours (refer to the Technical DescripQon of the propeller). This inspecQon applies to newly installed propellers or those that were dismantled and reinstalled on the airplane. c) Inspec2on aCer the first 25 flight hours: Engine inspecQon. CauQon: This inspecQon should be performed with either a new engine or an engine a;er overhaul. d) Periodical inspec2on aCer 50 flight hours: Includes inspecQon of both the engine and propeller. DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 30 e) Periodical inspec2on aCer 100+5 flight hours: Covers airframe and propeller inspecQons, as well as engine inspecQon according to the maintenance system described in the Maintenance Manual (Line Maintenance) for the installed engine. 4.3 Maintenance Maintenance occurs at periodically esQmated intervals. Pay amenQon to revising parts based on their funcQon, wear, and importance. The purpose of periodical maintenance is to prevent or detect damage or wear in the aircra; construcQon that could lead to part failure. Specific maintenance guidelines: • Engines maintenance: Follow the maintenance manual for the installed engine (e.g., ROTAX 912UL/S engines). • Propeller maintenance: Refer to the propeller manufacturer’s manual (e.g., Kaspar’s propeller manual). • Aileron, flap, rudder, elevator, and trim surfaces hinges: Ensure free, noiseless movement without backlash. Re-grease once per each 100 flight hours or annually. In dusty condiQons, clean and grease more frequently. • Front leg movement: Pay amenQon to the sliding surface of the leg and its wear. Verify zero movement in the X and Y axes of the leg within the lower and upper “perQnax” guides. Clean and re-grease every 50 flight hours or annually. Adjust for extreme operaQng condiQons. • Bowden cable for throjle, choke, and ven2la2on valve: Re-grease annually. Adjust for extreme condiQons. • Swing-bearings of control rods: Grease annually. Adjust for extreme operaQonal condiQons. • Pitot-Sta2c system: Consistently check for seal condiQon, proper funcQon, hose connecQons, and secure instrument connecQons. Ensure the Pitot-tube intake is free and clean. Remove condensate water if present and dry the system. • Check the 2ghtening of bolts: Engine’s frame - check the bolts between engines bed and firewall, between engine’s frame and engine’s ring, DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 31 between engine and engine’s ring Front undercarriage – check the bolts on lower and upper guide, bolt of shock absorber, bolt of front wheel and bolts amaching fork to leg Main undercarriage – check bolts amaching legs to U/C beam, check the M12 bolt with plasQc washer on the leg, check the main wheels nuts Elevator control system – check the bolts connecQons of the control rods with steering, angle lever and elevator. At same places check the secure nuts of swing- bearing of the rods Front leg control system – check the bolts connecQons of the control rods with front leg steering arm and pedals. At same places check the secure nuts of swing-bearing of the rods Ailerons control system – check the bolts connecQons of the control rods with steering levers, angle levers in wings and ailerons. At same places check the secure nuts of swing- bearing of the rods Flap control system – check bolt amaching flap control handle to U/C beam, bolts connecQng pushing rod to handle and to torsion tube, check the secure nuts of swing- bearing of pushing rod. Rudder control system – check the bolts amaching ropes to rudder and to pedals, check the secure-wiring on turnbuckles • Special equipment inspec2ons – given by suppliers manuals (for example ballisQc rescue system) DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 32 4.4 Periodical inspec2on aCer the first 25 hours SERIAL NUMBER: FLIGHT HOURS: REGISTRATION: NUMBER OF STARTS: PRESCRIBED INSPECTIONS MADE BY CHECKED BY Engine and propeller According to engine’s manual According to propeller’s manual Engine’s cowlings Remove and check engine’s cowlings for any signs of thermal damage, bubbles or cracks Engine frame InspecQon, Qghtening, securing (if necessary) of engine’s ring and frame bolts. InspecQon of welded frames for any signs of cracks, inspecQon of rubber shock absorbers between engine’s ring and frame Intake system InspecQon of air-filters, their amachment to carburemors InspecQon of intake pipes InspecQon of carburemors – amachment, control, cleanness Electrical installa2on DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 33 InspecQon of wires and cables for undamaged condiQon, their connecQon and securing Bajery Check the bamery voltage (should not be less then 12,4V unplugged) and wires connecQons Fuel installa2on Visual inspecQon of seal installaQon Cooling system InspecQon of undamaged hoses, their connecQons, amachment and securing Check the volume of cooling liquid in system Check the density of cooling liquid to prevent freezing in winter condiQon. Fill in non-frost liquid if needed Damaged hoses need to be replaced Oil system Check the oil level in oil tank according to engine’s manual Provide inspecQon of cooler for cleanness, seal and undamaged condiQon. Check the cooler amachment for cracks. Exhaust system InspecQon of exhaust system for any signs of crack or damage on welds or tubes Check the silencer amachment and its faultless condiQon Check the self-locking nuts used on exhaust system Front undercarriage DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 34 Inspect condiQon and amachment of front leg, check and refill if necessary pressure of front Qre Inspect and Qght if necessary all unmovable joints with bolts, all moveable joints secure Main undercarriage Inspect condiQon of composite leg for cracks, cranny or holes, even for paint damage. In case of finding menQoned fault, contact the manufacturer Inspect Qghtening of bolts Check hydraulic brake system for leak Wing Visual inspecQon for loose rivets, skin deformaQon, cracks or other damages Visual inspecQon of fuel tank for leak Aileron Visual inspecQon Check free noiseless movement InspecQon of hinges InspecQon of controls Flap Visual inspecQon, check free noiseless movement InspecQon of hinges and controls Wings anchor Visual inspecQon, cleaning, conservaQon Tightening of joint verifying Fuselage Visual check for loose rivets, skin deformaQons, crack or other damage DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 35 Cockpit canopy InspecQon of canopy latch Horizontal tail surfaces Visual check for loose rivets, skin deformaQons, crack or other damage InspecQon of free noiseless elevator’s movement Check elevators hinge InspecQon of trim surface and control Inspect stabilizer amachment with verQcal fin Check fiberglass ends of stabilizer Ver2cal tail surfaces Visual check for loose rivets, skin deformaQons, crack or other damage InspecQon of free noiseless rudder movement InspecQon of rudder hinges Check securing of hinges and bolts joint Cockpit Inspect proper funcQon of choke control Inspect proper funcQon of thromle control Inspect proper funcQon of vent control Inspect proper funcQon of propeller control Steering joys2ck Inspect free noiseless movement Inspect backlashes in the system Inspect securing of bolts Pedal steering Inspect strength of system Inspect securing of bolts InspecQon for hydraulic brake system leak InspecQon of rudder ropes condiQon and amachment DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 36 Flap control Inspect free noiseless movement Pitot’s tube InspecQon for clean waterless undamaged condiQon Notes: Date: Signature: DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 37 4.5 Periodical inspec2on aCer the first 50 hours SERIAL NUMBER: FLIGHT HOURS: REGISTRATION: NUMBER OF STARTS: PRESCRIBED INSPECTIONS MADE BY CHECKED BY Fuselage InspecQon of fiberglass fairing between wing and fuselage for faultless condiQon InspecQon of fiberglass fairing between fin and fuselage for faultless condiQon InspecQon of spur for faultless condiQon InspecQon of side windows of fuselage for faultless condiQon InspecQon of venQlaQon system for proper funcQon and condiQon InspecQon of proper funcQon and condiQon of canopy latch InspecQon of condiQon and completeness of safety equipment, if it is installed InspecQon of Qres condiQon, inspecQon of rubber sealing of canopy. InspecQon of canopy amachment InspecQon of rivet lines of undercarriage beams InspecQon of condiQon and amachment of accessories like antenna, strobe... DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 38 Wing Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon including fiberglass parts. InspecQon of wing hinges backlashes in fuselage amachment InspecQon of condiQon and amachment of winglets InspecQon of condiQon of posiQon lights InspecQon of condiQon of strobe lights InspecQon of condiQon of landing light Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon including fiberglass parts. Ailerons Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon InspecQon of free noiseless movement InspecQon of hinge Flaps Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon Inspect free noiseless movement Inspect the hinge Inspect controls rods Empennage Horizontal tail surfaces InspecQon of amaching and securing of horizontal tail surfaces DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 39 Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon InspecQon of fiberglass ends of stabilizer and its amachment Inspect free noiseless movement of the elevator Visual inspecQon of trim surface Visual inspecQon of trim surface’s and elevator’s control and their securing Ver2cal tail surfaces Visual inspecQon for loose rivets, deformaQons, cracks and other damages of construcQon including fiberglass parts. InspecQon of rudder condiQon and amachment InspecQon of lower rudder bushing and securing of lower hinge InspecQon of upper rudder bushing and securing of upper hinge Inspect free noiseless rudder movement Inspect condiQon and rudder control ropes securing Controls Steering joysQck Inspect free noiseless movement Check backlashes Inspect securing of bolts Inspect steering limits condiQon Steering pedals DOVA Aircra;® DV-1 Skylark – Maintenance Manual v3.0 40 Inspect free noiseless movement Inspect backlashes in system Inspect securing of bolts Check the system limits condiQons Inspect condiQon, pre-stress and securing of controlling ropes Inspect hydraulic brake system for leak Flap control Inspect free noiseless movement Inspect securing of bolts Inspect flap control handle and its posiQon lock funcQon Elevator’s trim surface control Serve-control inspecQon Inspect system backlashes Inspect securing of trim surface hinge pin Verify neutral posiQon of trim surface Inspect trim surface posiQon indicator Equipment Verify its completeness and its validity of documentaQon Inspect Instrument panel condiQon and electrical connectors securing Inspect instruments connecQons and funcQonality Check condiQon and funcQon of switches and fuses Inspect condiQon and funcQon of thromle, choke controls, fuel valve, heaQng and venQlaQon controls Check the readability and completeness of labels