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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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For AOG assistance contact:

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Quick Links

07/01/21

Message Overview:

Message Name:

AMBER RAD FLAG ON PILOT PFD

Message Code: 344OBS003
Effectivity: All
System: Radio Altimeter System
System Description: 34-44-00
Schematic Diagram: 34-44-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 34-44-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Message Description:

Amber RAD Flag (Radio Altitude miscompare) on Pilot Primary Flight Display (PFD).

Possible Causes:

  • Radio Altimeter Transceiver 1 (A67)
  • Radio Altimeter Transmit Antenna 1 (E19)
  • Radio Altimeter Receive Antenna 1 (E20)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

NOTE: The radio altimeter (RA) supplies altitude signals to other systems. When one of these signals does not show, the smart LRU will send a fault (CAIMS) report about the RA. You can get access to the active faults on the CAIMS PMAT to find the fault messages and the fault isolation procedure. If there are more than one CAIMS fault message about a RA, the RA is the most possible cause.

Quick Links:

Removal of the Radio Altimeter Transceivers AMM 34-44-01-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Radio Altimeter Transceivers AMM 34-44-01-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Radio Altimeter Antennas AMM 34-44-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Radio Altimeter Antennas AMM 34-44-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform wiring checks of Rad Alt 1 strappings.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  2. Perform wiring checks between Rad Alt 1 and Rad Alt 1 antennas.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  3. Swap RAD ALT 1 with RAD ALT 2.

    1. If the system checks are good, replace RAD ALT 1 and do close out.
    2. If fault remains, continue with next step.

  4. Swap Rad Alt transmit antenna 1 with Rad Alt transmit antenna 2.

    1. If the system checks are good, replace Rad Alt transmit antenna 1 and do close out.
    2. If fault remains, continue with next step.

  5. Replace Rad Alt receive antenna 1.
  6. Do close out.

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