TM 1-1520-238-23
7-12
7.2.
HYDRAULIC SYSTEM LEAK CHECK
7.2.1. Description
This task covers:
Leak Check.
7.2.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Fluid service unit (item 137, App H)
Personnel Required:
67R
Attack Helicopter Repairer
One person to assist
152F
Pilot (if method a(3) is used)
References:
TM 55-1520-238-10
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
7.2.3. Leak Check
NOTE
This task verifies hydraulic system leaks or system integrity.
a. Apply pressure to hydraulic system. The hydraulic system may be pressurized by:
(1) External hydraulic power:
(a) Primary hydraulic system (para 1.72).
(b) Utility hydraulic system (para 1.73).
(2) APU:
(a) Using battery power (para 1.74).
(b) Using external power (para 1.75).
(3) Ground run of helicopter (TM 55-1520-238-10).
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