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 | 160
FOR SIMULATION USE ONLY – NOT A TRAINING AID
ON-BOARD OXYGEN GENERATING SYSTEM (OBOGS)
NOTE
OBOGS operation with mask down or loose fitting may induce OBOGS fail
warning. If OBOGS fails with mask down or loose, secure mask. If fault does
not automatically clear after securing mask, perform I-BIT check. If I-BIT
check passes, no further action is required.
The aircraft has an on-board oxygen generating system (OBOGS). The OBOGS
provides each pilot with an automatically regulated oxygen supply which has a
slight positive pressure and no duration limitations.
Oxygen is extracted from conditioned bleed air by pressure swing absorption using
a molecular sieve. The OBOGS distribution network includes a plenum which
provides a limited supply of oxygen in the event of OBOGS failure.
Duration of the plenum supply is based upon cockpit pressurization, aircraft
pressure altitude, pilot regulator settings and pilot demand. If the OBOGS fails,
emergency oxygen is provided by manually selecting the ejection seat oxygen
supply.
Seat oxygen is supplied through the CRU-60/P connector. If an OBOGS failure
occurs, the anti-suffocation valves allow the pilot to breathe cockpit ambient air.
Control of the OBOGS is provided for each cockpit with a panel-mounted oxygen
pressure regulator. OBOGS is powered from the hot battery bus and has no pilot
resettable circuit breaker.
WARNING
Inflight engine failure and/or total loss of electrical power will result in a
loss of bleed air supply to the OBOGS concentrator and subsequent OBOGS
failure.
Emergency oxygen is available by pulling the green handle on the left side of
the ejection seat.
The OBOGS concentrator may malfunction, resulting in zeolite dust in the
breathing system without warning illumination. Indications of the malfunction
include respiratory irritation, coughing, or the presence of white dust in the
oxygen mask. Adequate oxygen concentration is still available to the pilots.
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