2. Ensure that the differential pressure bleed
valve V-7, the test pressure gauge to bell jar V-2,
and the system bleed valve V-5 are closed. Open
the differential pressure shutoff valve V-8.
3. Place the bell jar on the adapter fixture and
secure it with a clamp. Now plug the bell jar top
coupling C-2.
4. Open the oxygen supply valve V-6 slowly
until 100 inches of H2O is indicated on the
differential pressure gauge DF-1. By closing valve
V-6, leakage will be indicated by a drop in
pressure on DF-1. There must not be more than
2 inches of H2O in 10 minutes.
5. Close the oxygen supply cylinder valve and
open the system bleed valve V-5 to bleed the
system.
6. Secure all test stand valves. Leave the
system bleed valve V-5 open.
CAUTION
W H E N T H E T E S T S T A N D IS
SECURED, ALL VALVES WITH THE
EXCEPTION OF THE SYSTEM BLEED
VALVE V-5 MUST BE CLOSED.
VALVE V-5 IS LEFT OPEN TO PRE-
VENT THE ACCIDENTAL BUILDUP
OF PRESSURE IN THE SYSTEM.
CLEANING
Clean all external parts, test adapters and
connections, gauge glasses, bell jar, O-ring, and
terminals of the liquid oxygen quantity gauge
capacitor-type tester with a soft, lint-free cloth.
The cloth may be dampened with oxygen clean-
ing compound (MIL-C-81302).
PERIODIC INSPECTIONS
Periodic leakage inspections are required to
be performed weekly. A pressure regulator (R-1)
setting must be performed weekly also. In
addition to the inspection requirements, the test
stand should be visually inspected for cleanliness,
freedom from oil and grease, missing or damaged
parts, and general condition.
TROUBLESHOOTING
Refer to table 11-2, Troubleshooting Chart,
for probable trouble causes and remedies.
Information in this chart is intended primarily to
aid oxygen shop personnel in diagnosing problems
most likely to be encountered in their daily use
of the test stand. Refer to NAVAIR 17-15BC-20
for parts removal and replacement.
Upon completion of any maintenance actions,
complete the maintenance forms outlined in the
NAVAIR 13-1-6.4.
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