PUMP vent (54) must be opened one to two turns
when you operate the pump (fig. 11-1).
ALWAYS ENSURE THAT THE PUMP
MOTOR HAS A FOUR-PRONG ELEC-
TRICAL CONNECTION PLUG. ON
MODEL 1172AS100 ENSURE THAT
THE GROUNDING LUG IS IN PLACE
AND SECURELY CONNECTED. A
SIDE VIEW OF THE VACUUM PUMP
IS SHOWN IN FIGURE 11-3.
Before you attempt to operate the test stand,
review the following safety precautions. These
safety precautions must be observed before,
during, and after test stand operation.
1. Ensure that the test stand is properly
secured prior to opening the supply cylinder valve.
Position the HIGH PRESSURE REGULATOR
to LOAD, then to VENT, and ensure that the
LOW PRESSURE REGULATOR is backed out
and the other valves are turned fully to the right.
2. Keep the chamber door closed whenever
3. Keep the test stand doors closed at all
4. Keep the test stand work tray closed when
it is not in use.
5. Check the pump lubricant prior to turn-
ing the pump on (run for 2 minutes and check
lubricant for proper level).
6. Keep your hands and head clear of belts
and pulleys while checking the lubricant level.
7. Ensure the test stand is properly grounded
by 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
11. When you use nitrogen, ensure that the
room is well ventilated.
12. Use proper tools for the job you are
13. Do not inhale lubricant, oxygen cleaning
compound, or mercury fumes.
14. Wash pump lubricant or mercury from
15. Secure the test stand completely after use.
16. Never leave the test stand unattended
while the pump is running.
17. When transporting the compressed nitro-
gen cylinder, you should ensure the protective cap
Maintenance on the oxygen components test
stand is discussed in the following paragraphs.
Maintenance on the 1172AS100 begins as soon
as the test stand is uncrated. You should fill the
OUTPUT, INPUT, and VENT FLOW ma-
nometers with a liquid that has a known specific
gravity of 1.0. The liquid used for the 1172AS100
is a mixture of one part concentrated green
manometer fluid (merian D-2930) mixed with 10
parts of water. To fill the manometers,
your first step is to adjust the scale so that the
zero is located half way between the full-up and
the full-down position.
Remove the fill plugs from the manometer
reservoirs and fill the reservoir until the fluid
reaches the zero mark on the scale. After you have
filled the reservoir to zero, replace the fill plugs.
To fill the pressure suction manometer with
fluid, use red manometer fluid with a specific
gravity of 1.9. The procedure is the same.
Adjust the scale so the zero mark is half way
between the full-up and full-down positions. You
have one more type manometer to fill. The Hg
manometer uses triple-distilled mercury. To fill
this manometer, follow the same procedure that
you used for the other manometers. Do not spill
the mercury. If you do, notify your supervisor,
and follow the special precautions for cleaning
To ensure maximum operating efficiency,
pressure/leakage tests must be performed
NOTE: Use systems schematic drawings as
an aid in determining any malfunctions
that may exist. You can find these
schematics in NAVAIR 13-1-6.4.