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(WARNING)
RED MESSAGE (CAUTION)
AMBER MESSAGE (ADVISORY)
CYAN MESSAGE (STATUS)
WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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Quick Links

09/06/19

Message Overview:

Fault Message:

PASSENGER OXY ON

Fault Code:

PASSOXON

Associated CAS:

PASSENGER OXY ON
(Advisory)

Reporting LRU: Oxygen System
System Description: 35-20-00
Schematic Diagram: 35-11-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 35-21-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

  • Oxygen is supplied to passenger masks manually
  • When cabin altitude reaches 14,500 +500 / -700 ft
  • Oxygen Test Switch in test

If any above condition is not true, then the following steps apply.

Possible Causes:

  • Oxygen Test/reset Switch (S112)
  • Oxygen Line Pressure Switch (S52)
  • Data Acquisition Unit (DAU) 4 (A31)
  • Copilot Bulkhead Relay (K750)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Data Acquisition Units (DAU) AMM 31-42-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Data Acquisition Units (DAU) AMM 31-42-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the PASSENGER OXYGEN Control-Panel AMM 35-21-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the PASSENGER OXYGEN Control-Panel AMM 35-21-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Swap DAU 4 with DAU 3.

    1. If system checks are good, replace DAU 4 and do close out.
    2. If fault remains, continue with next step.

  2. Perform wiring checks between DAU 4, K750, Oxygen line pressure switch and Oxygen test switch.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  3. Replace Oxygen line pressure switch.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  4. Replace Passenger Oxygen Control

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  5. Replace K750.
  6. Do close out.

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