TM 1-1520-238-T-5
7–88
Change 2
7–21.
UTILITY HYDRAULIC SYSTEM – MAINTENANCE OPERATIONAL CHECK (cont)
7–21
Task
Result
ag. Subtract measurement A from B. Cylinder
travel is 1.564 to 1.624 inches.
If cylinder travels full stroke, go to step ao.
ah. Check servocylinder for fluid leakage
(TM 1-1520-238-23).
If leakage is present, replace leaking servocylinder
(TM 1-1520-238-23).
NOTE
If all servocylinders strokes are within specified limits, go to step ap.
ai. Disconnect push–pull rod from servocylinder
valve arm (TM 1-1520-238-23).
aj. Slowly push servocylinder valve arm upward
to fully retract piston.
ak. Have assistant measure and record cylinder
stroke with inside calipers. Measurement A
is from bottom of the jam nut to top surface
of the servocylinder housing (cylinder
retracted).
al. Slowly pull servocylinder valve arm
downward to fully extend piston.
am. Have assistant measure and record cylinder
stroke with inside calipers. Measurement B
is from bottom of the jam nut to top surface
of the servocylinder housing (cylinder
extended).
an. On pilot center circuit breaker panel
(fig. 7–35), check that RTR BRK circuit
breaker is closed.
If RTR BRK circuit breaker does not stay closed, go
to paragraph 7–33.
ao. Subtract measurement A from B. Directional
cylinder travel is 1.564 to 1.624 inches. All
other cylinder travel is 3.500 to 3.560
inches.
If cylinder does not travel full stroke, replace
servocylinder (TM 1-1520-238-23).
If cylinder travels full stroke, perform appropriate flight
control system rigging operational check
(TM 1-1520-238-T-7).
