Piper SARATOGA PA-32-301 Maintenance Manual page 547

PIPER AIRCRAFT
PA-32-301/301T
MAINTENANCE MANUAL
GENERAL.
INSPECTION OF EXHAUST SYSTEM. (Refer to Figure 78-1 for PA-32-301 installations.)
A very thorough inspection of the entire exhaust system, including heat exchange shroud, (muffler and
muffler baffles on PA-32-301 or complete tailpipe assembly on PA-32-301T), stacks and all exhaust
connections must be accomplished at each 100 hour inspection. 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
-
It is recommended that all airplanes be fitted with a new (muffler
PA-32-301 or tailpipe assembly for PA-32-301T) at or near 1000
hours of service life.
On PA-32-301 removal of the tailpipe and stacks are required for inspection of the muffler baffles. On
PA-32-301T removal of the tailpipe is required for inspection of the cabin heat shroud and heat sink material
under the shroud on the tailpipe. Remove or loosen all exhaust shields, cabin heat shroud, 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 baffles or diffusers on
PA-32-301. Any cracks, warpage or severe oxidation are cause for replacement of muffler or tailpipe assembly.
If any component is inaccessible for a thorough visual inspection, accomplish one of the following:
1. Accomplish a submerged pressure check of the PA-32-301 muffler and exhaust stack at 2 psi air
pressure or perform a submerged pressure check of the tailpipe assembly at 20 psi air pressure on PA-32-301T
airplanes.
2. 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. 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 on the
PA-32-301 or tailpipe assembly on PA-32-301T must be replaced.
3. On PA-32-301 insure the proper installation of the shroud on the muffler upon reassembly.
A. Check the left end of muffler and shroud assembly to determine if the shroud retaining tabs are
totally visible on the outside of the shroud. (Refer to Figure 78-1.)
B. If tabs are not visible and the shroud is mislocated, remove and reinstall the shroud in the proper
position.
C. 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 to fully extend to its down lock position.
78-01-00
Page 78-01
2L16
Issued: January 2, 1980
2L16