TM 1-1520-238-T-4
Change 9
5–37
5–19.
GROUND TRACK AND ADJUSTMENT USING AVA EQUIPMENT
5–19
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
Adapter, Socket
A–A–2172
Wrench, 3/8, 1/2
Drive
Crowfoot Attachment,
FC42
1–5/16, 3/8 Drive
Wrench, Open–end
A–A–1356
1–1/4 & 1–5/16 (2)
Wrench, Torque,
TCI–1600
1/2 Drive
Materials/Parts:
Lockwire, MS20995NC32
Personnel Required:
152FG
Maintenance Test Pilot
152FG
Pilot
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
Main rotor blade phase
completed
AVA track and balance kit
installed
Special Environmental Conditions:
Wind velocity of 20 knots or more may affect accuracy
of readings.
NOTE
Phasing the main rotor blades cannot be emphasized enough, this is the
base starting point for track and balance and if not done, will not allow
track and balance to be completed in a timely manner.
The FM antenna on the tail should be removed before running the aircraft
for track and balance to prevent damage to the antenna. The antenna
should be installed when track and balance is complete.
The GNDTRK flight plan’s goal is to obtain a flat track on the ground by
adjusting pitch links only. It should be emphasized that the better your
ground track the better your starting point, which will greatly increase
your success rate for track and balance.
The tail rotor balance (paragraph 5–23) should be accomplished before
any in flight checks are performed. The tail rotor balance procedure can
be performed during a ground run. If the tail rotor is wired, just take the
measurements during the first ground run, and make the adjustments
and check the balance again on the next ground run.
a. PREPARATION
(1) Apply aircraft power (TM 1-1520-238-23).ec
(2) Operate aircraft at 100% Nr, flat pitch.
(3) Turn DAU ON.
(4) Turn CADU ON.
