TM 1-1520-238-T-4
5–36
Change 9
5–18.
RECOMMENDED STEPS PRIOR TO AIRCRAFT OPERATION
5–18
Tools:
Nomenclature
Part Number
Tool Kit, Aircraft
SC518099CLA01
Mechanic’s
Aviation Vibration
6625-01-282-3746
Analysis Test Set
Helicopter Rotor Head
4920-01-180-7610
Balance and Blade
Track Run Test
Equipment
Personnel Required:
67R
Attack Helicopter Repairer
67R3T
Inspector
References:
TM 1-1520-238-23
TM 1-1520-238-MTF
Equipment Conditions:
Ref
Condition
TM 1-1520-238-23
Helicopter safed
Main rotor assembly
inspection completed
a. Prior to aircraft operation the following steps are recommended:
(1) Check erosion of leading edge rotor blade in area that tracker views. If underside of leading edge paint
is eroded, lightly paint (fog) the underside of leading edge in area of tracker view with flat black paint.
(2) Check accelerometer type. Select appropriate “AIRCRAFT TYPE” (AH64 OR AH64NB) from main
screen on CADU. Select manager option (F4), then select “SETUP” and select “ACCELEROMETER”. For AH-64
script file, accelerometer channels 5 – 14 should be defined as “AH64 Acc”. For AH-64NB script file,
accelerometers 1 – 14 should be set to “Wil M991”, or to the type that is being utilized for the wire around
accelerometers.
(3) Check for 0.003 – 0.007 INCH gap of magnetic pick-up, and check interrupters to ensure that they are
not deformed.
(4) Verify main rotor blade trim tab markings (TM 1-1520-238-23).
(5) If new blades are installed, verify that trim tabs are set to 0 degrees for all blade pockets (#0–10).
(6) If previously tracked blades are installed, measure and record trim tab settings. If trim tabs are bent in
a uniform direction, do not adjust tabs before flying blade to verify track. If trim tabs are bent in opposing
directions, zero trim tabs for all blade pockets (#0–10). If trim tab in pockets #0–3 are not 0, this should be noted
for possible future troubleshooting, see troubleshooting sections (para 5–22).
(7) The FM antenna on the tail should be removed before running aircraft for balance to prevent damage
to antenna. The antenna should be installed when balance is complete.
END OF TASK
