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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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07/08/19

Message Overview:

AUX PRESS ON
(Status)

DDG Reference: 21-62
Pilot Action (QRH): ENVR 06-22
System Description: 21-60-00
Schematic Diagram: 21-60-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 21-60-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

AUX PRESS Pushbutton on the BLEED AIR Control Panel is not set to ON position.

Possible Causes:

  • AUX PRESS Pushbutton/BLEED AIR Control Panel
  • AUX PRESS Pushbutton wiring
  • PCB1 Circuit Card/JB 5
  • PCB1 Circuit Card/JB 6
  • Air-Conditioning System Controller (ACSC) 1
  • Air-Conditioning System Controller (ACSC) 2

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Pushbutton/Toggle Switch AMM 20-11-01-000-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Pushbutton/Toggle Switch AMM 20-11-01-400-804 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Bleed Air Control Panel AMM 36-11-57-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Bleed Air Control Panel AMM 36-11-57-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Air-Conditioning System Controllers AMM 21-60-21-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Air-Conditioning System Controllers AMM 21-60-21-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Junction Box JB5 Circuit Card AMM 24-00-10-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Junction Box JB6 Circuit Card AMM 24-00-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Junction Box JB6 Circuit Card AMM 24-00-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram 36-11 WM 36-11 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram 21-60-04 WM 21-60-04 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. On the BLEED AIR control panel, make sure that AUX PRESS pushbutton is not set to the ON position.
  2. Swap PBAs.

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

  3. On the BLEED AIR control panel, perform wiring checks for an open circuit between the pins of the connectors and aircraft ground that follow:

    AP8J1 AIRCRAFT GROUND
    pin 45 Ground
    AP8J2 AIRCRAFT GROUND
    pin 46 Ground

    1. If there is continuity to ground, continue.
    2. If there is no continuity to ground, go to step 5.

  4. Replace BLEED AIR control panel.

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

  5. Repair or replace the interface wiring.

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

  6. Replace PCB 1 in JB5.

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

  7. Replace PCB 1 in JB6.

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

  8. Replace ACSC 1.

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

  9. Replace ACSC 2.

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

    10. NOTE: Only one new ACSC is required for steps 8 and 9.
  10. Replace JB5.

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

  11. Replace JB6.
  12. Do close out.

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