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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:

RADIO FREQUENCY UNIT (RFU) COOLING FAN INOPERATIVE

Identifier: 215OBS014
Effectivity: AC9002 to AC9135 only
System: Air Conditioning System
Associated CAS: None
System Description: 21-54-00
Schematic Diagram: 21-54-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 23-13-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

RFU fan does not operate.

Possible Causes:

  • RFU Fan has an obstruction and cannot turn freely
  • Fan
  • Fan Wiring
  • Radio Frequency Unit (RFU)

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:

RFU Cooling Fan - Removal AMM 21-54-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
RFU Cooling Fan Cooling Fans - Installation AMM 21-54-17-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Check for 115 VAC power supplied to RFU fan at A35J2 pin H. (Make sure circuit breaker SATCOM FREQ UNIT is closed).

    1. If no 115 VAC, continue with next step.
    2. If there is 115 VAC, go to step 3.

  2. Repair wiring of CPB1.

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

  3. Perform wiring checks between RFU fan, RFU and CBP1.

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

  4. Replace defective RFU fan.

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

  5. Replace RFU.
  6. Do close out.

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