MAULE AEROSPACE TECHNOLOGY, INC.
MAINTENANCE MANUAL
FOR
MT-7-420
9/02
16
h.
Check balance the propeller.
If the aircraft propeller strikes an object causing damage to the propeller blades requiring
blade replacement and overhaul of the propeller assembly, remove the engine and send it to a
designated overhaul facility for inspection.
a.
Refer to the appropriate Propeller Service Instructions and Overhaul Manual.
b.
Refer to the Special Inspections required after propeller strike and/or crash in the Engine
Overhaul Manual.
Hard Landing Limits
Make a visual inspection of the installed engine for external damage from airframe compo-
nents after any hard landing. Engines that have sustained landing forces exceeding 10g shall
be sent to an overhaul facility.
Compressor Inlet Air Blockage
Replace the compressor assembly if the engine has been operated with inlet air restricted
due to foreign objects or materials which have become lodged in the compressor inlets. Tag
the replaced compressor to show that the cause of removal was inlet air blockage. Conditions
which constitute blockage are as follows:
a.
Foreign objects or materials found in the inlet during inspection of the aircraft when not in
operation. If it can be determined that the blockage was not there during the last opera-
tion of the engine, remove the foreign object or material and leave the compressor in
service.
b.
Power loss encountered following a restriction at the compressor inlet area while the en-
gine is in operation. Blockage in flight can usually be verified by inspection after landing
(blockage still exists). However, some blockage may be followed by ingestion before in-
spection can take place. Objects or materials which were large enough to have stopped
at the inlet guide vanes before ingestion, or which cause a noticeable raise in TOT, can
be considered to have caused compressor inlet blockage.
