TM 9-2350-261-20-1
N O T E
You are allowed to operate equipment with
minor leaks (Class I or II). You must consid-
er how much fluid the item or system being
checked or inspected can hold. When in
doubt, notify your supervisor. Any fuel or
Class 111 leaks will make the vehicle NOT
READY/ AVAILABLE.
b. CHECKING FOR LEAKS AFTER A MAINTENANCE TASK. After doing maintenance on a part which
involves hoses or fluid lines, check for leaks. If leaks occur after you have done a replace or repair task, find
the source of the leak, Correct the problem. Follow these procedures.
(1) Do visual inspections to find the source of the leak.
(a) Check for cracks on housing or cover.
(b) Check that screws and any connections are not loose or overtight.
(2) If you cannot see the source of the leak, repeat the maintenance task. Check the items listed below as
you repeat the task.
(a) Check that preformed gasket is not bent, or pinched.
(b) Check machined surfaces for fit and cleanliness.
(c) Install new” replacement parts.
(3) After you repeat the task and install a new part, the leak could persist. If so, report the problem to
your supervisor.
c. CHECKING FOR LEAKS USING CHALK TEST. Following replacement, repair, or adjustment of a
ramp, door, hatch cover, access panel, or rubber seal, check for leaks by performing a chalk test. Use the
following procedures.
(1) Use chalk or chalk powder to coat area around seal.
(2) Close ramp, door, hatch cover, or panel.
(3) Open ramp, door, hatch cover, or panel.
(4 Check for unbroken chalk line on mating surface. Where chalk does not stick to mating surface, there
is a leak in the seal surface.
(5) If a leak is found, perform adjustment to correct the problem.
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