TM 1-1520-238-23
7-442
7.115.
PRESSURIZED AIR SYSTEM LEAK CHECK
7.115.1. Description
This task covers:
Leak Check.
7.115.2. Initial Setup
Tools:
Aircraft mechanic’s tool kit (item 376, App H)
Materials/Parts:
Brush (item 34, App F)
Leak test compound (item 109, App F)
Personnel Required:
67R
Attack Helicopter Repairer
152F
Pilot (if method a(3) is used)
References:
TM 55-1520-238-10
Equipment Conditions:
Ref
Condition
1.57
Helicopter safed
NOTE
This task verifies pressurized air system leaks and verifies system integrity after maintenance.
7.115.3. Leak Check
a. Apply pressure to pressurized air system. Pressurized air system may be pressurized by:
(1) Application of external power - air (para 1.71).
(2) Operation of 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).
b. Check for leaks. Use leak test compound (item 109, App F) and brush (item 34, App F).
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