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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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01/28/21

Message Overview:

FDR FAIL
(Advisory)

DDG Reference: 31-31
Pilot Action (QRH): AVNC 02-36
System Description: 31-61-00
Schematic Diagram: 31-31-00
Wiring Diagram: 31-31-01

Message Description:

The cyan 'FDR FAIL' advisory CAS message indicates the flight data recorder has failed. Voltage is monitored by the DCU A14BP1 pin 2G. When there is a loss of this voltage, the 'FDR FAIL' message is posted. This is indicated as FDR status out on the block drawing.

Possible Causes:

  • Impact Switch (S81)
  • Flight Data Recorder (FDR) (A145)
  • Data Concentrator Unit (DCU) (A14)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Flight Data Recorder (FDR) AMM 31-31-01-000-801
Installation of the Flight Data Recorder (FDR) AMM 31-31-01-400-801
Operational Test of the Flight Data Recorder (FDR) AMM 31-31-01-710-801
Reset of the Flight-Data-Recorder (FDR) Impact Switch AMM 31-31-17-440-801
Removal of the Flight Data Recorder (FDR) Impact Switch AMM 31-31-17-000-801
Installation of the Flight Data Recorder (FDR) Impact Switch AMM 31-31-17-400-801
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
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. Power interruptions through Impact Switch (S81) and power control relays is most likely the suspect.
  2. Check or reset the Impact Switch for the FDR system. Check the Impact Switch is receiving 28 VDC power from CB2-D7.
    NOTE: If repeat issue of having to reset Impact Switch, replace Impact Switch.
  3. If the Impact Switch has power, check for continuity between the Impact Switch and the DCU A14BP1 pin 9G. There should be continuity with no short to ground.
  4. Remove the FDR and the DCU. Perform a continuity check of the FDR FAIL input as follows:

    From To Expected Result Result
    A145P1-21 A14BP1-2G Continuity
    A145P1-21 Ground Open

    1. If continuity is results are as per the table above, continue with next step.
    2. If results are not as per the table above, repair defective wiring as required.

  5. Replace the FDR.
  6. Do close out.

31_flight_data_recorder_block

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