Leak Test Of Muffler - Piper PA-44-180 SEMINOLE Maintenance Manual

GENERAL.
DESCRIPTION (PA-44-180).
This exhaust system is a muffler system, exhaust gases are discharged through an opening in the center of the
lower cowl. A heat shroud is installed for an alternate air heat rise for the carburetor. For removal of the exhaust
system, the following procedures may be performed:
1. Remove lower cowl.
2. Remove hardware from the alternate air tube and disconnect tube from shroud.
3. Remove hardware attaching exhaust system to engine, remove exhaust system.
4. Reinstall the exhaust system in reverse of removal instructions.
LEAK TEST OF MUFFLER (PA-44-180).
Make sure to inspect each muffler clip joint for excessive exhaust leakage, minor
discoloration and leakage is normal. If excessive leakage is displayed repair as
described in Service Letter No. 860.
Each muffler should be subjected to the following leak test:
1. Plug muffler inlets.
2. Connect low pressure air supply to outlet (approximately 2 psi).
3. Submerge the muffler in water.
4. Repair or replace any muffler that leaks.
5. Upon completion of repairs, retest mufflers.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
— Note —
INSPECT LOCATIONS INDICATED
Figure 78-1. Muffler Inspection
3H21
7 8 - 0 2 - 0 0
Page 78-01
Revised: May 15, 1989