I A P 2 0 2 3 . 0 0 1 - A F M / I R I S T E X A N I I P A G E | 162
FOR SIMULATION USE ONLY – NOT A TRAINING AID
OXYGEN PRESSURE REGULATOR
A panel-mounted oxygen pressure regulator is installed on the right side console of
each cockpit. Each regulator has a supply lever, a concentration lever, a pressure
lever, a built in test (BIT) button, a flow indicator (blinker), and a maximum
concentration light. Each regulator panel controls OBOGS electrical power and
oxygen flow for the respective cockpit.
In the event of hypoxia symptoms, or loss of cabin pressure, the regulator can be
“gang-loaded” to provide high oxygen content, pressurized breathing by placing the
supply lever to ON, the concentration lever to MAX, and the pressure lever to
EMERGENCY.
Oxygen Pressure Regulator Supply Lever
The supply lever has two positions, placarded ON and OFF. When set to OFF, OBOGS
electrical power and oxygen flow are cut off to the respective regulator. However, if
the supply lever for either regulator is ON, the OBOGS system is operative. Both
supply levers must be OFF to disable the OBOGS system.
Oxygen Pressure Regulator Concentration Lever
The concentration lever has two positions, placarded NORMAL and MAX. When the
lever is set to the NORMAL position, the regulator directs the OBOGS concentrator
to provide the proper oxygen concentration for the present altitude.
Oxygen concentration with the lever in NORMAL position ranges from 25 to 70% for
altitudes from sea level to 15,000 feet MSL, and from 45 to 95% for altitudes from
15,000 to 31,000 feet MSL.
When the concentration lever for either regulator is set to MAX, the OBOGS
concentrator supplies the highest possible oxygen concentration (95% oxygen, 5%
inert gas) to both regulators.
The maximum concentration light illuminates any time either concentration lever is
in the MAX position.
Oxygen Pressure Regulator Pressure Lever
The pressure lever has three-positions placarded, respectively, EMERGENCY,
NORMAL, and TEST MASK. The EMERGENCY position supplies the pilot with the
positive pressure necessary during emergency situations such as cockpit fires or
hypoxia symptoms. When the lever is set to NORMAL, the regulator supplies a
slight positive pressure in addition to the pressure demanded by the pilot through
the mask.
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