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TM 9-254
3-23.
Level Assembly and Cover Assembly Leakage Test.
a.
Purpose of Test. To leak test level assemblies 11731291 or 10543755 and cover assembly 10543756 prior
to installation on the elbow telescope. This procedure will help eliminate the possibility of the unit developing a leak during
the over all leakage test of the elbow telescope.
b.
Level Assembly 11731291 or 10543755. Perform the leakage test for the level assembly as follows:
NOTE
o
Steps (2) through (7), refer to figure 3-48.
o
Insure that preformed packing is secured to bottom of level assembly before securing
to fabricated adapter.
(1)
Perform the setup of the single stage pressure test fixture as described in paragraph 3-18a.
(2)
Secure level assembly (7) to the fabricated leak test adapter (4) (fabricate per fig. C-1, appx C) 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 3-49.
(7)
Completely immerse the level assembly (5) and fabricated leak test adapter (3) into a container of clear
water (1).
(8)
While immersed, inspect the areas around the level vial (4) and lamp shell (2) for the presence of air
bubbles that indicate pressure leaks.
(9)
Remove level assembly (5) 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).
3-50
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