TM 1-1520-238-23
7-213
7.50.
SERVOCYLINDER CHECK VALVE REMOVAL/INSTALLATION
7.50.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
7.50.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Light duty laboratory apron (item 27, App H)
3/16 - 5/8-inch hexagon x 1/2-inch drive screwdriver bit
set (item 37, App H)
Industrial faceshield (item 129, App H)
Chemical protective gloves (item 154, App H)
10 - 50 inch-pound 1/4-inch drive click type torque
wrench (item 434, App H)
Materials/Parts:
Backup ring (4)
Packing (2)
Hydraulic fluid (item 92, 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 servocylinders only)
Access panel R200 removed
(collective and longitudinal servocylinders
only)
Access panel L200 removed
(lateral servocylinder only)
7.3
Primary hydraulic system vented
7.57
Utility hydraulic system vented
NOTE
This task is typical for primary and utility check valves in the directional, collective, lateral, and
longitudinal servocylinder. Valves differ only in their locations.
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