FAA Advisory Circular 43.13-1B
Acceptable Methods, Techniques, and Practices
Aircraft Inspection and Repair
AC 43.13-1B | 8. Engines, Fuel, Exhaust, and Propellers | 3. Exhaust Systems | 8-52. Augmentor Systems
AC 43.13-1B
9/8/98
FIGURE 8-22. Effect of improperly positioned exhaust
pipe/muffler clamp.
high-altitude operation, the exhaust system
pressure is maintained at, or near, sea level
values. Due to the pressure differential, any
leaks in the system will allow the exhaust
gases to escape with a torch-like intensity that
can severely damage adjacent structures. A
common cause of turbo-supercharger mal-
function is coke deposits (carbon buildup) in
the waste gate unit causing erratic system op-
eration. Excessive deposit buildups may cause
the waste gate valve to stick in the closed po-
sition, causing an overboost condition. Coke
deposit buildup in the turbo-supercharger itself
will cause a gradual loss of power in flight and
low deck pressure reading before takeoff. Ex-
perience has shown that periodic decoking, or
removal of carbon deposits, is necessary to
maintain peak efficiency. Clean, repair, over-
haul, and adjust turbo-supercharger system
components and controls in accordance with
the applicable manufacturer’s instructions.
8-52. AUGMENTOR SYSTEMS. Inspect
augmentor tubes periodically for proper align-
ment, security of attachment, and general
FIGURE 8-23. Primary inspection areas.
overall condition. Regardless of whether or
not the augmentor tubes contain heat ex-
changer surfaces, they should be inspected for
cracks along with the remainder of the exhaust
system. Cracks can present a fire or CO haz-
ard by allowing exhaust gases to enter nacelle,
wing, or cabin areas.
8-53.8-70. [RESERVED.]
Page 8-28
Par 8-51