TM 1-1520-238-23
4-429
4.136.
ENGINE TURBINE SPEED CONTROL UNIT ADJUSTMENT (T700-GE-701 ENGINE) – continued
CAUTION
Np adjustment unit is very sensitive. To
prevent damage to power plants, adjust-
ments shall be made very slowly at pilot’s
direction.
NOTE
To increase NP speed, turn NP adjust-
ment screw clockwise. To decrease NP
speed, turn NP adjustment screw coun-
terclockwise.
e. Slowly adjust screw (2) on control unit (3) as
required to obtain 100% Np.
f. Hold screw (2). Tighten nut (1).
g. Observe TGT indicator for following condi-
tion:
(1) If TGT temperature is steady, go to step h.
(2) If TGT temperature is fluctuating, go to step i.
h. Increase collective for approximately 30%
dual engine torque indication and observe
TGT indicator for following condition:
(1) If TGT temperature is steady, go to step j.
(2) If TGT temperature is fluctuating, go to step i.
i. Adjust turbine speed control for both mini-
mum TGT fluctuation and ENG RTR indica-
tions from 99% to 101% Nr. Go to step h.
j. Hold screw (2). Tighten nut (1).
k. Lockwire nut (1) to control unit (3). Use wire
(item 222, App F).
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