Parts to be inepsctad

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.