TM 1-1520-238-23
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Change 8
1.108A. MAIN ROTOR TRACK AND BALANCE AVA KIT INSTALLATION
1.108A.1. Description
This task covers:
Aircraft Preparation. Equipment Installation. Universal Tracking Device (UTD) Installation. SPU
Bypass Installation Instructions. Night-Time Tracking Setup Instructions.
1.108A.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Helicopter rotor head balance and blade track run test
equipment (item 353A, App H)
Aviation vibration analysis test set (item 354B, App H)
Maintenance platform (item 209, App H)
Materials/Parts:
Screw, machine NAS603–10P
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
1.108A.3. Aircraft Preparation
a. Position main rotor blades.
(1) Rotate main rotor head such that double in-
terrupter is over magnetic pickup and mark
blades as follows:
(a) Blade #1 is over nose of aircraft.
(b) Blade #2 is to the right as viewed from aft
of aircraft.
(c) Blade #3 is over tailboom.
(d) Blade #4 is to the left as viewed from aft
of aircraft.
(2) Mark blades accordingly.
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NO. 4
NO. 1
NO. 2
DOUBLE INTERRUPTER
OVER MAGNETIC PICKUP
NO. 3
AH64 VIEWED
FROM ABOVE
ROTATION
TOP VIEW OF MAIN ROTOR BLADES
M04-5208-11
