Inspection Procedures

TB 1-2840-229-20-17

(3) Select option three (3).

(4) Select the number next to the T53N2 script file.

(5) After the file loads and the selection screen appears, press "QUIT" to return to the boot up

menu. Remove memory card and press "One" to proceed with normal AVA operation.

NOTE

If adapter mount (P/N LTCT535) is not available, units may fabricate the

adapter using the drawing supplied with the AVA Memory Card, The

adapter mount must meet the specifications of the drawing.

e. Modify adapter mount (P/N LTCT535) from Spectrum Analyzer Kit (NSN 6625-00-590-6502) as

follows:

(1) Drill hole 0.213 inch (#3) in top-center of adapter.

(2) Tap hole for threads 1/4 x 28 UNF.

(3) InstaIl accelerometer (NSN 6680-01-326-1913) from AVA Test Set into top of modified

adapter mount using two, flat washers (NSN 5310-00-141-1795) between bracket and accelerometer.

AVA Test Set installation.

(1) Secure Data Acquisition Unit (DAU) in aircraft with canvas straps and "D" rings.

(2) Remove the assembly from one of the pilot's console lights. Remove the bulb. Plug

the AH-1 power cable adapter (29317100) lamp socket. Ensure that the lamp is set to full intensity

(clockwise).

(3) Connect the grounding clip to a screw head or any non-painted metal surface, which will

provide an adequate path to aircraft ground.

(4) Connect power cable to the DAU receptacle marked 28vDC.

(5) Locate Control and Display Unit (CADU) in aircraft and connect CADU to DAU cable

(29325601).

NOTE

Ensure adequate clearance between end of accelerometer threads and

mounting lug.

(6) Attach adapter and accelerometer assembly to upper-forward engine lifting eye, utilizing

hardware supplied in the Spectrum Analyzer Kit. There should be a bolt, washers, lock washer and nut in

that kit to secure the bracket to the lifting eye. Reference TM 55-2840-229-23-1, pages 1-214 and 1-215.

If the hardware is not available the following is a list of parts required:

NSN

DESCRIPTlON

PART NUMBER

AN8-23A

Bolt, Machine, Aircraft

5306-00-180-0097

1/2-20 UNF-3AX2, 15/32 LG

AN960-816

5310-01-259-1239

Washer, Flat

I AN935-816

5310-01-258-0051

Washer, Lock, Spring

AN315-8R

Nut, Plain, Airframe, 1/2-20

5310-00-298-9267