PIPER CHEROKEE SERVICE MANUAL
01/31/08
III - INSPECTION
3K1
(14) FUEL TANK/WING SPAR CORROSION INSPECTION.
Paragraphs (a) and (b) are keyed to Figure 3-12 (i.e. – (a)1 corresponds to A1 in figure).
(a) Each seven calendar years time-in-service, remove the fuel tanks and conduct inspections
as specified below. Each inspection is for corrosion (intergranular, exfoliation, etc.), but
while exposed all areas and parts should be checked for other anomalies such as damage,
cracking, or wear. Any part or area determined to be defective must be repaired or
replaced using standard FAA approved parts and methods.
1
Inspect the fuel tank attach hardware and gang channels (nut plate strips).
2
Inspect the exterior of the fuel tanks for leaks. Inspect the interior for corrosion or
sloshing compound. If either condition exists, clean, repair, or replace the fuel tank
as required.
3
Remove fuel quantity senders. Inspect for condition, operation, and security and
freedom of movement of the float arm. Inspect condition of wires and terminals.
Replace components as required. Replace gaskets.
4
Inspect hard fuel vent lines for interior and exterior corrosion, wear, or deposits.
Flush and clean with mineral spirits under pressure. If excessive debris, deposits,
or corrosion observed, replace the line.
5
Inspect flexible fuel hoses and couplings. Replace as required. Replacement is
recommended regardless of serviceability.
6
Inspect the spar, spar angles (cap), and ribs behind and adjacent to the fuel tank. If
corrosion is detected, conduct a thorough inspection of the entire wing.
7
Remove the lacing at the wing root and inspect the spar and forward wing attach
fittings.
(b) Treat the following areas with Dinotrol AV 8 before reassembly.
1
Wing spar at root and forward wing attach fittings.
2
Entire wing spar, spar angles (cap), and ribs behind and adjacent to the fuel tank.
(15) CAST MAIN LANDING GEAR STRUT CYLINDER 100 HOUR INSPECTION.
In PA-28-140/150/160/180/235’s, for those airplanes which are not equipped with forged main
landing gear strut cylinders P/N 65489-002 on both left and right sides;
each 100 hours time-
in-service, inspect the cast main landing gear strut cylinders (P/N’s 65319-002/-003/-004) as
follows:
NOTE: Installation of the improved forged main landing gear strut cylinder P/N 65489-002 on
both the left and right sides eliminates this repetitive inspection requirement.
(a) Thoroughly clean the area to be inspected as indicated in Figure 3-13 using a suitable
cleaner.
(b) Using a 10X power magnifying glass, visually inspect the gear cylinder top and bottom
radii at the torque link attach lugs for cracks (Figure 3-13). If no cracks are found by
visual inspection, proceed to Liquid Penetrant Inspection per latest revision of AC43.13-1
to check for cracks. Strip the paint and primer from the area to be inspected using a
commercially available chemical paint stripper taking care only to remove paint and
primer from the inspection area.
Summary of Contents for Cherokee 140 PA-28-140
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