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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

03/25/21

Message Overview:

Message Name:

ALTIMETER FAIL

Message Code:

B3-007669

Associated CAS:

None

Reporting LRU: RAD ALT 4000
System Description: 34-44-00
Schematic Diagram: 34-44-00
Wiring Diagram: 34-44-01

Message Description:

Altimeter Failure indicated by RAD ALT.

Possible Causes:

  • Radio Altimeter Transceiver (RAD ALT 4000) (A32)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Data Concentrator Unit (DCU) AMM 31-41-01-000-802
Installation of the Data Concentrator Unit (DCU) AMM 31-41-01-400-802
Removal of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
Operational Test of the Radio Altimeter System AMM 34-44-00-710-801
Removal of the Radio Altimeter Transceiver AMM 34-44-01-000-801
Installation of the Radio Altimeter Transceiver AMM 34-44-01-400-801
Removal of the Radio Altimeter Antenna AMM 34-44-09-000-801
Installation of the Radio Altimeter Antenna AMM 34-44-09-400-801
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Inspect the Radio Altimeter Unit. Make sure the antenna coaxial cables and connectors are properly secured into place.

    1. If antenna connections are secured, continue with next step.
    2. If antenna cables are not secured properly, rectify as required.

  2. Perform a wiring check between the RAD ALT unit and the IAPS as follows:

    From To Result
    A32P1-55 A4P101-49
    A32P1-52 A4P101-50
    A32P1-2 A4P1-49
    A32P1-10 A4P1-50

    1. If wiring defects are found, repair defective wiring as required.
    2. If wiring checks are good, continue with next step.

  3. Replace the Radio Altimeter unit.
  4. Do close out.

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