TM 1-6625-724-13&P
0075 00
0075 00-21
TASK 5 – MAINTENANCE TESTS
PROCEDURE 1: PERFORM 50-HOUR VIBRATION CHECKS
a. Perform task 1, Test Equipment Installation/Checkout, procedures 2, 7 and 8.
b. Turn on aircraft power.
c. Setup the measurement mode on the CADU using the flight plan 50HOUR.
d. After the measurement setup parameters have been run, the available Test States are displayed (OILCLR and
AFTFAN).
e. Operate aircraft on the ground at 100% NR, flat pitch.
f. Highlight OILCLR using the arrow keys. Press the DO key twice. This test will measure data from the two
accelerometers mounted to the combiner transmission oil cooling fan mounting flange studs (task 1, procedure
7).
NOTE
After the first measurement startup has been run and
vibration data is measured on laterally mounted
accelerometer 1 (ACC1), a second measurement setup
is run and vibration data is measured on the
longitudinally-mounted accelerometer 3 (ACC3).
NOTE
If measurement errors occur, press QUIT on the CADU.
Either “partial” or “failed” is displayed. When an error
occurs, an error code is displayed and the error is
identified. Either correct the cause of the error or, if safe
to do so, continue with the sequence tests.
g. Highlight the AFTFAN line using the arrow keys. Press the DO key twice. This test will measure data from the
two accelerometers mounted on the AFT transmission cooling fan flange (task 1, procedure 8).
NOTE
After the first measurement startup has been run and
vibration data is measured on laterally mounted
accelerometer 9 (ACC9), a second measurement startup
is run and vibration data is measured on vertically
mounted accelerometer 10 (ACC10).
NOTE
If measurement errors occur, press QUIT on the CADU.
Either “partial” or “failed” is displayed. When an error
occurs, an error code is displayed and the error is
identified. Either correct the cause of the error or, if safe
to do so, continue with the sequence tests.
h. If no errors occur and the AFTFAN test is “done,” a menu will appear to either finish or continue. Highlight the
finished condition and press DO to have the data stored.
i. Press QUIT on CADU. The Main Menu is displayed on the CADU.
j. Press F2 to enter DISPLAY mode.
k. Select View Limits from the Display Mode menu and press DO on the CADU.
l. If measured values exceed limits, perform procedures from TM 55-1520-240-23.
m. If values are within limits, press UP arrow to view all values.
n. Remove AVA equipment from the aircraft.
o. Inventory AVA kit and adapter kit to ensure all parts are removed from the aircraft.
