TM 1-1520-238-23
7-273
7.66.
UTILITY HYDRAULIC MANIFOLD AIR CHECK VALVE REPLACEMENT
7.66.1. Description
This task covers:
Removal. Cleaning. Inspection. Installation.
7.66.2. 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)
30 - 150 inch-pound 1/4-inch drive click type torque
wrench (item 435, App H)
Materials/Parts:
Filter
Packing
Damping fluid (item 69, App F)
Petrolatum (item 138, App F)
Personnel Required:
67R
Attack Helicopter Repairer
67R3F
Attack Helicopter Repairer/Technical
Inspector
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
2.2
Access door R325 opened
7.57
Utility hydraulic system vented
7.66.3. Removal
a. Remove tube (1) from air check valve (2).
(1) Hold check valve (2). Remove nut (3).
(2) Remove and discard filter (4).
b. Remove and discard check valve (2) and
packing (5) from manifold (6).
7.66.4. Cleaning
a. Wipe removed and attaching parts with a
clean rag.
7.66.5. Inspection
a. Check tube for chafing, cracks, dents, nicks,
and scratches (para 7.56).
b. Check nut for cracks, stripped threads, and
rounded flats (para 7.56).
c. Check removed and attaching parts for corro-
sion (para 1.49).
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