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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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06/22/21

Message Overview:

Message Name:

VHF COMM UNIT COOLING FANS INOPERATIVE

Identifier: 215OBS018
Effectivity: ALL
System: AIR CONDITIONING
Associated CAS: None
System Description: 21-54-00
Schematic Diagram: 21-54-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-11-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

One or more of the VHF COM unit fans does not operate.

Possible Causes:

  • The fan has an obstruction and cannot turn freely
  • Fan
  • VHF Comm Unit
  • Fan Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Notice To Operators (NTO): None

Flight Operation Notifications Manual (FONM): None

Quick Links:

VHF Comm Unit Cooling Fans - Removal AMM 21-54-29-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
VHF Comm Unit Cooling Fan Cooling Fans - Installation AMM 21-54-29-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
VHF Communication Units - Removal AMM 23-11-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
VHF Communication Units - Installation AMM 23-11-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram 23-11-02 WM 23-11-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram 23-11-03 WM 23-11-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Disconnect applicable VHF COMM unit fan power connector (VHF COMM 1 - A1P1) (VHF COMM 2 - A2P1) (VHF COMM 3 - A226P1). Do 28 VDC voltage and ground check as follows:
    VHF 1

    From To Expected Result Result
    A1J1-2 Ground 28 VDC
    A1J1-54 Ground Continuity

    VHF 2

    From To Expected Result Result
    A2J1-2 Ground 28 VDC
    A2J1-54 Ground Continuity

    VHF 3

    From To Expected Result Result
    A226J1-2 Ground 28 VDC
    A226J1-54 Ground Continuity

    1. If there is voltage and ground, continue with next step
    2. If there is no voltage or ground, go to step 3

  2. Perform a continuity check between the applicable VHF COMM unit and cooling fan
    VHF 1

    From To Result
    A1P1-2 Fan B1 PWR contact
    A1P1-54 Fan B1 RTN contact

    VHF 2

    From To Result
    A2P1-2 Fan B2 PWR contact
    A2P1-54 Fan B2 RTN contact

    VHF 3

    From To Result
    A226P1-2 Fan B61 PWR contact
    A226P1-54 Fan B61 RTN contact

    1. If there is continuity, replace cooling fan
    2. If there is no continuity, repair defective wiring and do close out

  3. Replace applicable VHF COMM unit
  4. Do close out

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