Fuel Tank / Wing Spar Corrosion Inspection - Piper Cherokee SIX 300 Service Manual

PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
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(21) FUEL TANK / WING SPAR CORROSION INSPECTION. (See Figures 3-17 and 3-18.)
NOTE: Paragraphs (a) and (b), below, are keyed to Figures 3-17 and 3-18.
(a) Each seven (7) 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.
A1. Inspect the entire spar and all spar angles behind each fuel tank with special attention
A2. Inspect the spar and forward attach fitting for condition and security. Check for
A3. Inspect fuel tank attach hardware and gang channels (nut plate strips) for condition.
A4. Replace flexible fuel vent hoses. Inspect vent hard lines for exterior and interior
A5. Remove fuel quantity senders. Inspect for condition, operation, and security and
A6. Inspect flexible fuel hoses and couplings. Replace as required.
A7. Inspect the exterior of each fuel tank for leaks. Inspect the interior for corrosion or
(b) Treat the following areas with Dinotrol AV 8 (P/N 89500-800; two (2) each per airplane)
before reassembly.
B1. Entire wing spar, spar angles (cap), and ribs behind and adjacent to each fuel tank.
III - INSPECTION
b If the insulation material has not been wet, or if new material is being installed,
ensure a six (6) inch clearance in the insulation has been cut out in all directions
around each attach fitting.
Locate the two 0.191 inch drain holes, one beneath each rear attach fitting, in the
bottom fuselage skin and ensure each is clean and free of obstruction.
NOTE: If there are no drain holes, install them as described in Figure 3-16.
Re-install floorboards, seats, interior panels, and other articles previously removed.
Perform a functional test of any system or component that may have been interrupted
or removed.
to the area of the inboard upper and lower spar caps. If corrosion is detected,
accomplish a thorough inspection throughout the wing.
loose, damaged or broken bolts or nuts.
Replace as required.
corrosion. Flush hard lines with mineral spirits under pressure through a clean cloth.
If excessive debris or corrosion deposits are observed replace the line.
freedom of the float on the arm. Inspect the condition of wires and terminals.
Replace components as required. Replace the gaskets.
WARNING: SLOSHING COMPOUND PROHIBITED.
evidence of sloshing compound. If either condition exists, clean, repair or replace the
fuel tank.
4F14
07/15/06