PERIODIC INSPECTIONS
Daily, weekly, biweekly, and monthly in-
spections are required. Detailed instructions are
outlined in the NAVAIR 13-1-6.4 and the Aircrew
Survival Equipmentman 3 & 2, Volume 2.
As you read this chapter, you will notice that
we use references such as F, 19, E, and so forth.
These reference numbers and letters are found in
figure 2-1. Also remember that the 1172AS100 test
stand is a modified version of the old 62A116E1
test stand; so don’t get them confused.
TROUBLESHOOTING THE 1172AS100
TEST STAND FOR LEAKS
As you have already read, leaks will probably
cause you the most problems in troubleshooting.
Locating a leak in one system is easier than
random troubleshooting all systems for a leak.
Nine different systems are incorporated within the
1172AS100 oxygen system component test stand.
Some of the systems are interconnected and used
simultaneously with other systems; therefore, you
must be familiar with each system.
A s c h e m a t i c i s p r o v i d e d t o a s s i s t y ou
in analyzing each system as we cover it. The
heavy black lines on each schematic depict
t h a t p a r t i c u l a r s y s t e m . A f e w s y m b o l s a re
used on the schematics to identify various
test stand components. Figure 2-2 is a list of
these symbols.
NOTE: To properly perform the leak checks
of the different systems, you must perform each
test in sequence or your test stand will not be
properly set up for your next test.
SAFETY PRECAUTIONS
Before you attempt to operate the test stand,
review the following safety precautions. These
safety precautions must be observed before,
during, and after the test stand operation.
1. Be sure you secure the test stand prop-
erly before opening the supply cylinder valve.
Position the high-pressure regulator (Q) to LOAD
then to VENT; ensure the low-pressure regulator
(N) is backed out and the other valves turned fully
to the right.
2. Keep the chamber door closed whenever
possible.
3. Keep the test stand doors closed at all
times.
4. Keep the test stand work tray closed when
it is not in use.
5. Check the pump lubricant prior to turning
the pump on.
6. Keep your hands and head clear of belts
and pulleys while checking lubricant level.
7. Be sure the test stand is properly grounded
(refer to Support Equipment Change 1223).
7A. (1172AS100 ONLY) Be sure the test
stand is properly grounded using the grounding
lug.
8. Never use regulated high pressure and
regulated low pressure together.
9. When the oxygen monitor alarm sounds,
leave the room.
10. Do not panic when the test stand mal-
functions.
11. When you use nitrogen, be sure the room
is well ventilated.
12. Use the proper tools for the job you are
performing.
13. Avoid breathing pump lubricant and
oxygen cleaning compound vapors; avoid lubri-
cant and compound contact with skin or clothing.
14. Avoid breathing mercury vapors; avoid
mercury contact with skin or clothing.
15. Secure the test stand completely after use.
16. Never leave test stand unattended while
pump is running.
17. When you transport a cylinder, be sure
the protective cap is on the cylinder.
SUPPLY NITROGEN SYSTEM
This system supplies a constant source of
nitrogen pressure to the other systems within the
test stand. It is tested for leaks during the
outward leakage test. This test is performed
2-2
