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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

06/22/21

Message Overview:

Message Name

CABIN COMMUNICATION SYSTEM INOP

Message Code: 231OBS001
Effectivity: Global Express, Global XRS
System: HF Communication
System Description: 23-14-00
Schematic Diagram: 23-14-00 [ Global Express ]  [ Global XRS ]
Wiring Diagram: 23-14-01 [ Global Express ]  [ Global XRS ]

Message Description:

The cabin communication system is unserviceable.

Possible Causes:

  • Air Radio-Telecommunication Unit (ARTU) (A246)
  • Cabin Distribution Bus Repeater (CDBR) (A243)
  • Cabin Distribution Bus Repeater (CDBR) (A244)
  • Cabin Distribution Bus Repeater (CDBR) (A245)
  • Cabin Handset
  • Duplexer (A247)
  • Call Alerter switch
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Air Radio−Telecommunications Unit (ARTU) AMM 23-14-01-000-801 [ Global Express ]  [ Global XRS ]
Installation of the Air Radio−Telecommunications Unit (ARTU) AMM 23-14-01-400-801 [ Global Express ]  [ Global XRS ]
Removal of the Cabin Distribution−Bus Repeaters AMM 23-14-13-000-801 [ Global Express ]  [ Global XRS ]
Installation of the Cabin Distribution−Bus Repeaters AMM 23-14-13-400-801 [ Global Express ]  [ Global XRS ]
Removal of the Duplexer AMM 23-14-17-000-801 [ Global Express ]  [ Global XRS ]
Installation of the Duplexer AMM 23-14-17-400-801 [ Global Express ]  [ Global XRS ]
Removal of the Call Alerter Switch AMM 23-14-21-000-801 [ Global Express ]  [ Global XRS ]
Installation of the Call Alerter Switch AMM 23-14-21-400-801 [ Global Express ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Access the ARTU. On the face of the unit, is the green LED on?

    1. If YES, go to step 6.
    2. If NO, continue with next step.

  2. On the EMS CDU open the AIRPHONE SYSTEM circuit breaker and remove the ARTU.
  3. On the EMS CDU close the AIRPHONE SYSTEM circuit breaker. Perform a 28 VDC voltage check and ground check as follows:

    From To Expected Result Result
    A246AP2-A Ground 28 VDC
    A246AP2-B Ground 28 VDC
    A246AP2-C Ground Continuity

    1. If voltage and ground are good, continue with next step.
    2. If voltage and ground are not good, investigate wiring and/or power source and repair as required.

  4. Perform a continuity check as follows:

    From To Result
    A246AP1-5 A246P2-D
    A246AP1-6 A246P2-E
    A246AP1-1 A246P2-C
    A246AP1-3 A246P2-A
    A246AP1-4 A246P2-B
    A246AP1-g A246P2-F

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

  5. Perform a continuity check as follows:

    From To Result
    A246AP1-5 Ground
    A246AP1-6 Ground
    A246AP1-1 Ground
    A246AP1-3 Ground
    A246AP1-4 Ground
    A246AP1-9 Ground

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

  6. On the face of the unit, is the red LED on?

    1. If YES, replace the ARTU.
    2. If NO, continue with next step.

  7. On the face of the unit, are the red and green LED on?

    1. If YES, replace the ARTU.
    2. If NO, continue with next step.

  8. On the face of the unit, does the green LED come on for less than one second and then go off?

    1. If YES, continue with next step.
    2. If NO, go to step 14.

  9. On the EMS CDU open the AIRPHONE SYSTEM circuit breaker. Disconnect ARTU connector A246P1.
  10. On the EMS CDU close the AIRPHONE SYSTEM circuit breaker. Does the green LED come on and stay on steady?

    1. If YES, continue with next step.
    2. If NO, go to step 14.

  11. On the EMS CDU, open the following circuit breakers: AIRPHONE SYSTEM and AIRPHONE REPEATER. Disconnect CDBR 1 connector A243P1. Perform a continuity check as follows:

    From To Result
    A246P1-M Ground
    A246P1-N Ground
    A246P1-d Ground
    A246P1-P Ground
    A246P1-J Ground
    A246P1-K Ground
    A246P1-L Ground
    A246P1-b Ground
    A246P1-X Ground
    A246P1-Y Ground
    A246P1-E Ground
    A246P1-F Ground

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

  12. Perform a continuity check as follows:

    From To Result
    A246P1-M A243P1-1
    A246P1-N A243P1-2
    A246P1-d A243P1-3
    A246P1-P A243P1-4
    A246P1-J A243P1-7
    A246P1-K A243P1-8
    A246P1-L A243P1-10
    A246P1-b A243P1-11
    A246P1-X A243P1-12
    A246P1-Y A243P1-13
    A246P1-E A243P1-6
    A246P1-F A243P1-9

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

  13. Swap CDBR 1 with CDBR 2. Is the fault still present?

    1. If YES, continue with next step.
    2. If NO, replace defective CDBR.

  14. Replace the ARTU.
  15. Do close out.

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