background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults By CAIMS By Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

06/22/21

Message Overview:

Message Name:

COCKPIT HAND MICROPHONE INOP

Message Code: 235OBS004
Effectivity: All
System: Audio Integrating System
System Description: 23-51-00
Schematic Diagram: 23-51-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-51-58 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Pilot or Copilot Hand Microphone does not operate correctly.

Possible Causes:

  • Pilot Hand Microphone (J157)
  • Copilot Hand Microphone (J156)
  • Audio Panel 1 (A8)
  • Audio Panel 2 (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Audio Panels AMM 23-51-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Audio Panels AMM 23-51-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Operational Test of the Hand Microphones AMM 23-51-17-710-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Make sure all the associated Audio Panel switches are set correctly by performing the Operational Test of the Hand Microphones (AMM 23-51-17-710-801). Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  2. Swap the Pilot and Copilot Hand Microphones. Is the fault still present?

    1. If NO, replace the defective microphone and do close out.
    2. If YES, continue with next step.

  3. Check which Hand Microphone does not function correctly?

    1. If the Copilot Hand Microphone does not function correctly, go to step 6.
    2. If the Pilot Hand Microphone does not function correctly, continue with next step.

  4. Disconnect the Pilot Hand Microphone and access the jack (J157). Disconnect Audio Panel 1 connector (A8P1). Perform a continuity check as follows:

    From To Result
    J157-T A8P1-A
    J157-R A8P1-K

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, replace Audio Control Panel 1 and do close out.

  5. Disconnect the Copilot Hand Microphone and access the jack (J156). Disconnect Audio Panel 2 connector (A9P1). Perform a continuity check as follows:

    From To Result
    J156-T A9P1-A
    J156-R A9P1-K

    1. If there is no continuity, repair defective wiring as required and do close out.
    2. If there is continuity, continue with next step.

  6. Replace Audio Control Panel 2.
  7. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.