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TM 9-254
3-23.
Level Assembly and Cover Assembly Leakage Test - Continued
c.
Cover Assembly 10543756. Perform leakage test of cover assembly as follows:
NOTE
o
Steps (2) through (7), refer to figure 3-48.
o
Insure that preformed packing is secured to bottom of cover assembly before
securing to the fabricated adapter.
(1)
Perform the setup of the single stage pressure test fixture as described in paragraph 3-18a.
(2)
Secure cover assembly (9) to the fabricated leak test adapter (4) with four machine screws (3) and four
wing nuts (5).
(3)
Connect hose assembly (8) to the inlet port (6) on fabricated leak test adapter (4).
(4)
Adjust pressure regulator valve (2) clockwise until 1 psig is registered on the low pressure gage (1).
(5)
Maintain a 1 psig pressure for 10 seconds, then adjust pressure regulator valve (2) counterclockwise to
the closed position.
(6)
Disconnect hose assembly (8) from the inlet port (6) and lay hose assembly aside.
NOTE
Steps (7) through (9), refer to figure 3-50.
(7)
Completely immerse the cover assembly (2) and fabricated leak test adapter (3) into a container of clear
water (1).
(8)
While immersed, inspect the area around the lamp shell (4) for the presence of air bubbles that indicates
a pressure leak.
(9)
Remove cover assembly (2) and fabricated leak test adapter (3) from the container of clear water (1).
NOTE
Steps (10) through (12), refer to figure 3-48.
(10) Release pressure from fabricated leak test adapter (4) at inlet port (6).
3-53
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