MAINTENANCE OF THE M88A1 - OD1672 - LESSON 3/TASK 1
Troubleshooting, Maintenance, and Repair
Operator maintenance and servicing of the APU is performed
by the operator and crew during the performance of the before, during, and
maintenance, and repair of components is performed by unit maintenance
personnel as a result of a malfunction being detected by the crew during the
regular PMCS or through the scheduled maintenance services performed by unit
Subsequent paragraphs provide an example of the
correct procedure unit personnel would follow for troubleshooting,
maintenance, and repair of the APU, specifically: ENGINE HARD TO START.
Before attempting to troubleshoot, unit maintenance personnel
should talk to the recovery vehicle operator as to the conditions under
which the vehicle had been operated.
Also, unit maintenance personnel
should look for any clues that would help to determine the cause of the
malfunction so that repairs may be effected and the equipment returned to
use as soon as possible.
The APU engine air intake tube and filter (figure 31 on the
following page) must be checked for any restrictions or for a dirty or
clogged air filter. Clean away any dirt or mud that is restricting the free
flow of air through the air intake tube. Clean the air filter in the same
the main engine air filter, discussed in lesson 2, task 1, on pages 52
Step 3. Visually check for leaking fuel lines and, by hand, feel for loose
fuel lines and fittings.
Tighten or replace defective lines or fittings.
Check for leaking fuel lines and fittings in accordance with the following
fuel leakage definitions:
(1) Class I leakage is a seepage of fluid indicated by wetness or
discoloration not great enough to form drops.