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 | 161
FOR SIMULATION USE ONLY – NOT A TRAINING AID
Prolonged inhalation of zeolite dust should be avoided.
A warning and caution illuminates in each cockpit to indicate OBOGS status. The red
OBOGS FAIL warning illuminates to indicate low bleed air pressure upstream of the
concentrator, low concentration of oxygen, or an internal failure detected by the
OBOGS BIT.
Prior to engine start or with a loss of bleed air, the OBOGS FAIL warning illuminates
due to the OBOGS low pressure switch closing from lack of bleed air pressure. The
warning extinguishes once the bleed air line is pressurized.
When first activated, the OBOGS power up BIT is initiated and the system enters a
sensor warm-up period which lasts approximately 3 minutes, during which the
OBOGS FAIL warning is inhibited.
After the 3 minute warm-up, the OBOGS FAIL warning illuminates if a failure is
detected during the self-test, or during operation, and remains illuminated until the
failure is cleared by the self-test or by resetting the regulators.
WARNING
Following OBOGS deactivation or loss of electrical power, concentration
monitor activation of the OBOGS FAIL light will be inhibited for 3 minutes
during OBOGS warm-up.
There is no indication of OBOGS concentration failure status during this
warm-up period. The low pressure switch will still activate the OBOGS FAIL
warning during the warm-up period.
If the temperature in the OBOGS ducting exceeds 200 °F, the OBOGS TEMP caution
illuminates.
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