Piper Cherokee LANCE, Service Manual

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PIPER CHEROKEE SIX / LANCE SERVICE MANUAL
07/15/06 III - INSPECTION
4E5
B. Procedures
(1) EXHAUST SYSTEM INSPECTION. (Refer to Figure 3-1 and 3-2.) A very thorough
inspection of the entire exhaust system, including heat exchange shroud, muffler, muffler
baffles, stacks and all exhaust connections must be accomplished at each 100 hour inspection
and whenever maintenance is performed on the exhaust system. The possibility of exhaust
system failure increases with use. It is recommended that the system be checked even more
carefully as the number of hours increase; for example an inspection at the 700 hour period
would be more critical than one in the 100 hour period. The system should also be checked
carefully before winter operation when the cabin heat will be in use.
NOTE: Fit all PA-32 airplanes with a new muffler at or near 1000 hours of muffler operation.
CAUTION: WHEN REMOVING OR INSTALLING COUPLING CLAMP, SLIDE CLAMP
OVER END OF PIPE BEFORE ASSEMBLY / DISASSEMBLY. EXCESSIVE
SPREADING CAN LEAD TO PREMATURE FAILURE OF CLAMP.
NOTE: When installing an exhaust clamp having an alignment pin be certain that the pin
engages the mating holes in exhaust pipe and muffler to prevent separation of
components.
Removal of the tail pipe and stacks is required for inspection of the muffler baffle. Remove or
loosen all exhaust shields, carburetor and cabin heat muffs, shrouds, heat blankets, etc., as
required to permit inspection of the complete system. Perform the necessary cleaning
operations and inspect all external surfaces for dents, cracks and missing parts. Pay particular
attention to welds, clamps, supports and support attachment lugs, slip joints, stack flanges and
gaskets. Inspect internal baffle or diffusers. Any cracks, warpage or severe oxidation are cause
for replacement of the muffler.
If any component is inaccessible for a thorough visual inspection, accomplish one of the
following:
(a) Accomplish a submerged pressure check of the muffler and exhaust stack at 2 psi air
pressure.
(b) Conduct a ground test using a carbon monoxide indicator by heading the airplane into the
wind, warming the engine on the ground, advancing the throttle to full static RPM with
cabin heat valves open, and taking readings of the heated airstream inside the cabin at
each outlet (including rear seat heat outlet, if installed). Appropriate sampling procedures
applicable to the particular indicator must be followed. If carbon monoxide concentration
exceeds .005 percent or if a dangerous reading is obtained on an indicator not calibrated
in percentages, the muffler must be replaced.
(c) For PA-32-300 and PA-32R-300 aircraft, ensure the proper installation of the shroud on
the muffler upon reassembly. Mislocation of the shroud could result in shifting of the
shroud with a resulting reduction of cabin heat and possible inability of the nose landing
gear on the PA-32R-300 to fully extend to its down lock position.