TM 1-1520-238-23
Change 4
4-431
4.137.
ENGINE TURBINE SPEED CONTROL UNIT ADJUSTMENT (T700-GE-701C ENGINE)
4.137.1. Description
This task covers:
Adjustment.
4.137.2. Initial Setup
Tools:
Aircraft maintenance tool kit (item 371, App H)
Materials/Parts:
Wire (item 222, App F)
Personnel Required:
68B
Aircraft Powerplant Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
152FG
Maintenance Test Pilot
References:
TM 1-1520-238-CL
TM 1-1520-238-MTF
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access
door
R2995
opened
1.134
Maintenance headset con-
nected
TM 1-1520-238-CL
Engines No. 1 and No.2
running
4.137.3. Adjustment
a. On pilot’s aft circuit breaker panel, open ECS
AFT FAN circuit breaker.
b. On pilot ENGINE INST DIM/TEST panel, set
switch to TST.
c. Remove lockwire from nut (1).
d. Hold NP adjustment screw (2).
(1) Loosen lock nut (1) on turbine speed control
unit (3).
CAUTION
NP adjustment unit is very sensitive. To
prevent damage to power plants, adjust-
ments shall be made very slowly at pilot’s
direction.
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