Fuel System - Inspection

 Note: compliance through extra off job sheet along with 100hr schedule

1. Check fuel caps, cap gaskets, cap adaptors, cap adaptor gaskets, fuel filler neck to adaptor sealer, fuel gage transmitter gaskets, gage transmitter access covers, and upper surface inspection covers for condition, proper sealing, security, alignment, etc. Ensure to service and clean these areas, replacing parts as necessary.

2. Drain and flush the fuel strainer and carburetor bowl completely.

3. Inspect the interior of metal fuel tanks for signs of corrosion, which may indicate water contamination.

• Inspect the interior of bladder tanks for wrinkles, broken or missing hangers, etc.

4.If signs of contamination are found, alert the owner and fuel supplier of your findings for corrective action.

5. If aircraft has a fuel drain valve replaced with a cap or plug, you should suspect water contamination in the respective tank. 

6. Take precautions to preclude water migration in the fuel tank system from an internal source (free water coming out of solution). Keep fuel tanks full when the airplane will not be operated regularly to minimize moisture condensation within the tanks. Keep fuel tanks full between flights, provided weight and balance limitations permit. Limit the fuel tanks exposure to large temperature fluctuations as much as possible. If the airplane has been exposed to sustained wing low or unusual attitudes or a fuel tank has been run dry, sump contaminants may have migrated throughout the fuel tank system.

7. Regularly check and verify quality controls are in place to ensure you receive only dry, uncontaminated fuel from a supplier. Have on-field checks and verify to ensure continued supply of dry uncontaminated fuel to an operator. Gain assurance that the fuel supply has been checked for contamination and is properly filtered before allowing the airplane to be serviced. When ordering fuel, specifically state the exact fuel grade and quantity needed. Be present at each and every refueling and observe the fueling process.

8. Collect all sampled fuel in a safe container and dispose of properly.

9. Replace all safety items removed during contamination checks. Correct all unsatisfactory conditions found during or any examination prior to further flight.

SERVICING OF NOSE WHEEL ASSEMBLY

S/n	Work to be carried out	Tech	AME/ App. Person
I 1. 2 3 4 5 II 1 2	DIS-ASSEMBLY: Completely deflate tyre and tube and break loose tyre beads. Extreme care must be taken to prevent tyre damage when removing tyre from wheel halves. WARNING:            Serious injury can result from attempting to separate wheel halves with tyre and tube inflated. Remove nuts and washers. Remove thru bolts and washers. Separate and remove wheel halves and brake rotating disc from tyre and tube. Remove retaining rings grease seal retaining rings, grease seal felts, grease seal retainers and bearing cones. NOTE:            Bearing cups are a press fit in wheel halves and should not be removed unles a new part is to be installed. To remove bearing cups, heat wheel in boiling water for 30mins or in an oven not to exceed 121°c (250°F) using an arbor press, if available press out bearing cup and press in new bearing cup while wheel half is still hot. INSPECTION AND REPAIR: Clean all metal parts and felt grease seals in suitable solvent and dry thoroughly. NOTE:            A soft bristle brush may be used to remove hardened grease, dust or dirt. Inspect wheel halves for cracks and damage.

			p. Person
3 4 5 6 7 8 9 10 11 12 III 1 2 3 4	Inspect bearing cones, cups, retaining rings, grease seal retaining rings, grease seal felts and grease seal retainers for wear or damage. Inspect thru bolts and nuts for cracks in threads or cracks in radius under bolt head. Replace cracked or damaged wheel half. Inspect tyre for side wall cracking, uneven wear and other damages. Record tyre si.no                               and mfg date                       Inspect tube for excess creasing and localised thinning/bulging. Check for leads especially around valve stem by inflating the tube and immersing in a water tank. Record  si.no                               and mfg date                       Replace damaged, retainer rings and seals. Replace worn or damaged bearing cups and cones. Replace any corrosion or small nicks. Repair reworked area of wheel by cleaning thoroughly. Then applying one coat of clear lacquer paint. Pack bearings with grease. ASSEMBLY: Assemble bearing cone, grease seal retainer, grease seal felt and retaining ring into each wheel half. Insert tube in tyre, aligning index marks on tyre and tube. NOTE:            The light weight point of the tyre is marked with a red dot on the side tyre wall and heavy weight piont of the tube is amrked with a contrasting colour line (usually near inflation valve stem) when mating tyre with tube these marks adjacent to each other. Replace wheel half into tyre and tube (side opposite valve stem) aligning base of valve stem in valve slot with washer under head of the bolt. Insert bolt through wheel half. Place wheel half into other side of tyre and tube aligning valve stem in valve slot.

  

5 6 7 8 9

Insert washer and nuts on the bolts and pre-torque to 10 to 50 lb.in. CAUTION:            Uneven or improper torque of the nuts can cause failure of the bolts with resultant wheel failure. Prior to torquing nuts, inflate tube with approximately 15-20 p.s.i air pressure to seat tyre. CAUTION:            Do not use impact wrenches on the bolts or nuts. Dry torque all nuts evenly to a torque value of 140 – 150 lb.in. Paint 1” wide creap marks on tyre and rim with red paint. Inflate tyre to correct pressure.

Propeller Strike Inspection

Sl. No.	Items	Mech	AME
1.	Consult the pilot as to the nature of the propeller strike incident.
2.	Inspect the propeller for damage
3.	Check the tightness of the propeller attachment bolts.
4.	Remove the propeller.
5.	Mount a D.T.I. and check the propeller flange run out.
6.	Inspect the back side of the flange at the radius to the shaft for any cracks.
7.	Inspect the crankcase visually for any cracks.
8.	Inspect the engine attachment to the engine mount for any damage.
9.	If there is a sudden stoppage of engine due to propeller strike, engine should be removed from the aircraft and sent to an approved overhaul facility for disassembly and detailed inspection.
10	Carryout any other inspections suggested by Manufactures.

Heavy Landing

Sl. No.	Items	Mech	AME
1.	Remove all inspection covers, fairings, floorboards and cowlings to facilitate inspection.
2.	Check for wrinkling of aircraft skin particularly in the main landing gear attachment area and nose gear attachment area.
3.	Check main landing gear spring strut for evidence of damage, distortion, crack and general condition.
4.	Check main landing gear fuselage attachment for damage, security and fuselage bulkheads for evidence of distrtion and crack.
5.	Remove main wheels and inspect wheel assy. for condition and damage.
6.	Check main wheels axle assy. for damage and security.
7.	Check nose gear attachment to fuselage for damage, distortion and security.
8.	Check nose gear / Oleo for evidence of fluid leak and extension. If necessary reservice the nose strut.
9.	Remove nose wheel and inspect wheel assy. for condition, cracks and damages.
10.	Magnaflux nose wheel axle.
11.	Check nose wheel shimmy dampner for damage and security.
12.	Check nose gear torque links for damage and security.
13.	Examine wing strut for bowing. If struts are found bowed, as certain cause and check strut attachment fittings at fuselage location and wing location for damage.
14.	Magnaflux strut attachment bolts.
Sl. No.	Items	Mech	AME
15.	Check wing attachment fittings to fuselage for damage.
16.	Check horizontal stabilizer attachment for signs of damage.
17.	Check vertical stabilizer attachment for signs of damage.
18.	Check flying control cables for slackness and layout.
19.	Check all instruments for proper functioning.
20.	Inspect the engine attachment to engine mount for any damage.
21. i). ii). iii).	If the wing tip grazes the ground, in addition to the above, carry out the following: Check incidence and dihedral of mainplane and tailplane. Check also symmetry of aircraft. (if any change, establish cause). Check wing tip bow structure for distortion / damage. Check for damage / distortion of wing spar structure internally upto and around the wing strut attachment point.
22.	Ground run engine and check performance of engine and instruments.
23.	Carry out taxy test.
24.	Check swing magnetic compass.
25.	Check the external condition of radio (by AME(R) or AME and the function should be certified by AME(R) or pilot training instructor).
26.	Test fly the aircraft, if required after pre – flight inspection.