TM 1-1520-238-23
7-191
7.47.
LONGITUDINAL SERVOCYLINDER REMOVAL
WARNING
FLIGHT SAFETY PART
The longitudinal servocylinder and/or components of the longitudinal servocylinder are flight
safety parts. Failure to follow maintenance instructions may result in serious injury or death of
crewmembers and/or serious damage to the helicopter.
7.47.3. Removal
a. Apply external electrical power to aircraft (para 1.70). Use aircraft power unit.
b. Apply external hydraulic power to aircraft (para 1.72). Use aircraft power unit.
c. Enter pilot station (para 1.56). Observe all safety precautions.
d. On pilot center circuit breaker panel, open ASE AC, DC, and BUCS circuit breakers.
e. Open trim circuit breaker on pilot forward circuit breaker panel.
CAUTION
Do not force movement of cyclic or collective control sticks if any binding is felt in system. Serious
damage can result to control system if cause of binding is not corrected.
f. Place pilot cyclic stick in full aft position.
g. Place pilot collective stick in full down position.
h. Remove external electrical power from aircraft (para 1.70).
i. Remove external hydraulic power from aircraft (para 1.72).
j. Vent primary hydraulic system (para 7.3).
k. Vent utility hydraulic system (para 7.57).
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