SB 740-94-8
4. Observe
for
bubbles
which
5. Verify that 3000-50 psig is
maintained for a minimum of 60 seconds.
indicate leakage.
6. Check the test gage for a
5. Verify that 100 5 psig is
maintained for a minimum period of 60 seconds.
minimum accuracy of 1 minor scale division. Any
gage out of calibration shall be readjusted, recalibrated,
6. Check the test gage for a
and retested.
minimum accuracy of 1 minor scale division. Any
7. Release the pressure, dry the
gage out of calibration shall be readjusted, recalibrated,
pressure cylinder test gage assembly, and return
and retested.
serviceable assemblies to storage.
7. Release the pressure, dry the
(5) Hose assembly, rubber (flexible low-
agent tank test gage assembly, and return serviceable
pressure aircraft hose) (NSN 1040-00-289-6044).
assemblies to storage.
(4) Test gage assembly, pressure cylinder
(a) Requirements.
(NSN 1040-00605-6297).
1. The hose shall not leak when
(a) Requirements.
subjected to an internal air pressure of 20 5 psig for a
minimum period of 60 seconds when tested as
1. The pressure cylinder test gage
specified.
assembly shall not leak and shall maintain an internal
2. The hose must not show signs
air pressure of 3000-50 psig for a minimum period of 60
of aging or other deterioration before or after the air
seconds when tested as specified.
pressure test.
2. The test gage shall be accurate
(b) Equipment required
to 1 minor scale division.
1. Regulated air pressure source
(b) Equipment required
(25 psig).
1. Regulated air pressure source
2. Water tank and water.
(3200 psig).
(c) Procedure.
2. Water tank and water.
1. Examine the hose for signs of
(c) Procedure.
aging or other deterioration.
1. Subject the pressure cylinder
2. Subject the hose to an internal
test gage assembly to an internal air pressure of 3000-
air pressure of 20 5 psig for a minimum period of 60
50 psig for a minimum period of 60 seconds with the
seconds with the hose submerged.
assembly submerged to the bottom of the gage.
3. Observe for bubbles which
2. Do not exceed a pressurizing
indicate leakage.
rate of 500 psig per minute.
4. Release the pressure and dry
3. Do not allow water to contact
the hose.
the gage.
5. Return serviceable hoses to
4. Observe for bubbles which
storage.
indicate leakage.
E-5
