To perform the safety pressure and pressure
breathing test, proceed as follows:
1. By using the LOW PRESSURE REGULA-
TOR, apply 150 psig to the regulator inlet. If
chamber altitude is not at 30,000 feet, adjust the
altitude by using VACUUM CONTROL valve
(B1) to increase or CHAMBER BLEED valve to
decrease altitude.
2. Using the OUTPUT valve, draw flows of
0, 40, and 85 lpm through the regulator. Delivery
pressure must be within limits shown on Regulator
Performance Test Sheet. Maintain 3.0 inches of
H2O on output manometer with OUTPUT valve
while ascending to altitude. The reading for 0 lpm
must also be recorded at each test altitude.
3. Repeat step 2 for each altitude shown on
the Performance Test Sheet.
4. Close the OUTPUT valve and descend to
sea level by using CHAMBER BLEED valve.
5. If the safety pressure breathing flows are
not within limits, locate the probable cause
using troubleshooting chart, table 12-14.
BLINKER ASSEMBLY TEST.— This test
ensures that the blinker operates correctly with
a demand placed on the regulator. To perform
the blinker assembly test, proceed as follows:
1. Ensure that diluter control lever is in the
NORMAL OXYGEN position.
2. By using the LOW PRESSURE REGULA-
TOR, apply 150 psig to the regulator inlet.
3. Using OUTPUT valve draw a 20 lpm
through the regulator. The blinker must open
fully.
4. Reduce output flow to 8 lpm and place
the diluter control lever in the 100-percent
OXYGEN position. The blinker must remain fully
open.
5. Close OUTPUT valve. The blinker should
close immediately.
6. Close the altitude chamber door. Ascend
to altitude while maintaining 3.0 inches of H2O
on the OUTPUT manometer with the OUTPUT
valve.
7. By using the VACUUM CONTROL valve
(B1) ascend in altitude until 17.0 inches of H2O
is indicated on the PRESSURE/SUCTION
manometer.
8. Open OUTPUT valve and draw a flow of
12 lpm through the regulator. The blinker should
be fully open. Close OUTPUT valve and the
blinker should close immediately.
9. Descend to sea level using the CHAMBER
BLEED valve.
10. Adjust or replace improperly functioning
blinkers.
EMERGENCY PRESSURE TEST.— Deter-
rnine how much pressure is supplied to the user
on emergency pressure. To perform the emergency
pressure test, proceed as follows:
1. Ensure the diluter control lever is in the
NORMAL OXYGEN position.
2. By using the LOW PRESSURE REGULA-
TOR, apply 150 psig to the inlet of the regulator.
3. Open the OUTPUT valve and draw a 10
lpm flow through the regulator.
Table 12-14.—Troubleshooting (Safety Pressure/Pressure Breathing Test)
12-17
