TM 55-1520-240-23-1
1-92
INSPECTION (Continued)
1-92
REF.
NO.
AREA
NO.
FREQUENCY
INSPECTION REQUIREMENTS
28.
4, 5
WHEN AN ENGINE NEW TO THE AIRCRAFT IS INSTALLED, AFTER REPLACEMENT OF A MAJOR
ENGINE COMPONENT (SUCH AS A HOT END), OR AFTER REPLACEMENT OF THE FUEL CONTROL
AND AFTER ADJUSTMENT OF 2 PERCENT OR GREATER OF THE GROUND IDLE SPEED OR ANY
ADJUSTMENT TO COMPRESSOR ROTOR MAXIMUM SPEED.
Perform a turbine engine analysis check (TEAC) (Task 4-3).
29.
4, 5
WHEN A NEW, OVERHAULED, OR PERMANENT STORAGE ENGINE IS INSTALLED:
Perform activation check run on the engine. Refer to TM 55-2840-254-23.
30.
4, 5
WHEN A ROTATING GAS PRODUCER COMPONENT OR POWER TURBINE ASSEMBLY IS REPAIRED
OR REPLACED OR IF EXCESSIVE ENGINE VIBRATION IS SUSPECTED:
Perform engine vibration check. Perform (AVA) check IAW TM 1-2840-265-23
and AVA Procedures. Refer to Task 4-14.
31.
4, 5 6,
7
WHEN AN ENGINE DRIVE SHAFT OR SYNCHRONIZING DRIVE SHAFT IS INSTALLED:
Torque check the adapter bolts and nuts at each end of the shaft which had
not been removed.
32.
4, 5
WHEN A CONE ASSEMBLY (TAILPIPE) IS INSTALLED OR REPLACED:
After initial engine ground run, RETORQUE COUPLING NUT TO 30
INCH-POUNDS ABOVE RUN-ON TORQUE.
33.
4, 5
WHEN STARTING OR BEEPING ENGINES, IF LOUD NOISES OR SHOCKS ARE FOLLOWED BY
SUDDEN HIGH INCREASES IN ENGINE TORQUE, OR IF A TORQUEMETER IS STATIONARY AT
HIGH VALUE AFTER SHUTDOWN:
Do not restart affected engine. Troubleshoot engine in accordance with Chapter
4 and engine transmission in accordance with Chapter 6 of TM 55-1520-240-T.
If cause cannot be determined, remove and replace engine and engine
transmission. Perform an engine over-torque/sudden engagement inspection in
accordance with TM 55-2840-254-23. Remove two electrical generators on aft
transmission and inspect shafts for evidence of damage.
34.
4, 5
WHEN AN ENGINE HOT END INSPECTION HAS BEEN PERFORMED OR AFTER A HOT END
SECTION, POWER TURBINE SHAFT, OR OUTPUT SHAFT HAS BEEN REPLACED:
Confirm that the output shaft and play inspection has been performed. Refer to
TM 55-2840-254-23.
35.
4, 5
ANYTIME AN ENGINE OPERATING LIMIT HAS BEEN EXCEEDED:
Download the digital engine control unit (DECU) prior to cleaning the limit
exceedence. See TM 1-2840-265-23 for instructions on downloading and
resetting the DECU.
Change 3
1-350.1
