TB 1-2840-229-20-17
7. Parts to be inepsctad. N/A
8. Inspection Procedures.
a. Inspect the aircraft engine for the part number of the engine. Confirm the serial number of
the engine by a physical inspection of the engine of the aircraft and spare engines in stock.
NOTE
Perform engine screening through a maintenancelight using qualified
test f
maintenance test flight personnel only.
NOTE
Questions regarding use of the AVA Memory Card or the vibration screening
procedures listed in paragraph 8. shall be addressed to Mr. Bob Branhof at
DSN 897-4948 or Commercial (256) 313-4948, E-mail <branhofb@
redstone.army.mil>, or the technical POC listed in paragraph 16.a
NOTE
This is a temporary vibration check. It does not replace the engine vibration
check that is required per TM 55-2840-229-23.
NOTE
During the vibration test, take as many points as possible on the ground.
b. Set up for use of components of Aviation Vibration Analyzer (AVA) test set (NSN
6625-01-282-3746). Reference paragraph 11. for parts required and TM 1-6625-724-13&P.
c. A preprogrammed AVA Memory Card (with T53N2, Version 2.0 script file) and data sheets are
required to conduct and record this test. To obtain the memory card and data sheets, contact your MACCM
POC as identified in paragraph 16. This script file (T53N2, Version 2.0) has eight test states that are used
for this engine vibration screening. The test states are listed below:
NOTE
Take as many test state points as possible on the ground.
TEST
TEST CONDITIONS
STATES
94% N2; 90% N1
94/90
97% N2; 85% N1
97/85
97% N2; 90% N1
97/90
95.5% N2; 95% N1
95/95
97% N2; 95% N1
97/95
98.5% N2; 95% N1
98+/95
97% N2; MAX Torque
97/MAX
100% N2; 90% N1
100/90
d. Install T53N2, Version 2.0 script file from AVA Memory Card:
(1) Reboot Control and Display Unit (CADU). Press "OFF", hold "HELP", and press "ON".
(2) Insert AVA Memory Card that contains T53N2, Version 2.0 script file.
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