TM 1-6625-724-13&P0075 000075 00-21TASK 5 – MAINTENANCE TESTSPROCEDURE 1: PERFORM 50-HOUR VIBRATION CHECKSa. 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 andAFTFAN).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 twoaccelerometers mounted to the combiner transmission oil cooling fan mounting flange studs (task 1, procedure7).NOTEAfter the first measurement startup has been run andvibration data is measured on laterally mountedaccelerometer 1 (ACC1), a second measurement setupis run and vibration data is measured on thelongitudinally-mounted accelerometer 3 (ACC3).NOTEIf measurement errors occur, press QUIT on the CADU.Either “partial” or “failed” is displayed. When an erroroccurs, an error code is displayed and the error isidentified. Either correct the cause of the error or, if safeto 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 thetwo accelerometers mounted on the AFT transmission cooling fan flange (task 1, procedure 8).NOTEAfter the first measurement startup has been run andvibration data is measured on laterally mountedaccelerometer 9 (ACC9), a second measurement startupis run and vibration data is measured on verticallymounted accelerometer 10 (ACC10).NOTEIf measurement errors occur, press QUIT on the CADU.Either “partial” or “failed” is displayed. When an erroroccurs, an error code is displayed and the error isidentified. Either correct the cause of the error or, if safeto 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 thefinished 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.
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