TM 1-1520-238-23
7-221
7.52.
SERVOCYLINDER SERVOVALVE REPLACEMENT
7.52.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
7.52.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
3/16-inch hexagon x 1/4-inch drive screwdriver socket
wrench attachment (item 322, App H)
7/64-inch hexagon x 1/4-inch drive screwdriver socket
wrench attachment (item 328, App H)
30 - 150 inch-pound 1/4-inch drive click type torque
wrench (item 435, App H)
0 - 30 inch-pound 1/4-inch drive dial indicator torque
wrench (item 445, App H)
Materials/Parts:
Packing (5)
Hydraulic fluid (item 92, App F)
Wire (item 222, App F)
Wire (item 226, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
References:
TM 1-1520-238-T
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access fairings L540 and L546 removed (di-
rectional servocylinder only)
Access panel L200 removed
(lateral servocylinder only)
Access panel R200 removed
(collective and longitudinal servocylinders
only)
7.3
Primary hydraulic system vented
7.57
Utility hydraulic system vented
NOTE
This task is typical for servovalves on
the lateral, longitudinal, collective, and
directional servocylinders. The direc-
tional servovalve is protected by an
armor plate not on the other servocy-
linders.
If replacing directional servocylinder
servovalve, go to step a. If not, go to
step b.
GO TO NEXT PAGE
M04-2650-1
