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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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05/06/21

Message Overview:

Message Name:

DMPS7 OR WIRING FAULT

Message Code:

B3-006659

Associated CAS:

APU GEN FAIL
(Caution)

ELECTRICAL FAULT
(Caution)

ELECTRICAL FAULT
(Advisory)

Reporting LRU: DIFF PROT SNSR 7
System Description: 24-31-00
24-64-00
Schematic Diagram: 24-31-10
24-61-00
Wiring Diagram: 24-31-09
24-64-01

Message Description:

The Auxiliary Power Unit Sensor DPMS 7 has detected a current imbalance between the 2 feeders.

A failure with the Auxiliary Power Unit Sensor DPMS 7 has been detected by the Aux DCPC.

Possible Causes:

  • Auxiliary Power Unit Sensor (DPMS7)
  • Auxiliary Power Unit Power Feeders
  • Auxiliary Power Center (Aux DCPC) (A196)
  • Left DC Power Center (LDCPC) (A35)

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-24-0024 - Electrical System - Troubleshooting Tips
  • AW300-24-0222 - Aft Fuselage - APU Generator Power Feeder Cable Fouling Condition (20501 - 20635)

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the APU Generator AMM 24-31-09-000-801
Installation of the APU Generator AMM 24-31-09-400-801
Operational Test of the APU Generator AMM 24-31-09-710-801
Removal of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-000-801
Installation of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-400-801
Operational Test of the Auxiliary DC Power Center (Aux DCPC) AMM 24-64-01-710-801
Removal of the Auxiliary Power Center Primary-Logic AMM 24-64-13-000-801
Installation of the Auxiliary Power Center Primary-Logic AMM 24-64-13-400-801
Removal of the Auxiliary Power Unit Sensor AMM 24-64-17-000-801
Installation of the Auxiliary Power Unit Sensor AMM 24-64-17-400-801
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. Disconnect the Auxiliary Power Unit Sensor DPMS7 connector. Do visual inspection of the connector and associated wiring for any loose pins and/or damaged wire.

    1. If inspection is satisfying, continue with next step.
    2. If inspection is not satisfying, go to step 4.

  2. Swap the Auxiliary Power Unit Sensor DPMS7 with Auxiliary Power Unit Sensor DPMS8. Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, replace the defective Auxiliary Power Unit Sensor.

  3. Do visual inspection and a wiring check (with a high precision milli-ohm meter) of the following feeder cables:

    From To Results
    Aux DCPC STUD T33 L DCPC STUD T83
    Aux DCPC STUD T35 L DCPC STUD T85

    1. If the results of the inspection and the wiring check are satisfying, go to next step.
    2. If the results of the inspection and the wiring check are not satisfying, repair/replace defective wiring.
      NOTE: Due to the high precision of the generator sensor (100mA), to confirm the integrity of a power feeder, it is suggested to connect an extra feeder cable to bypass the suspected one.

  4. Replace the Aux DCPC (A196). Is the fault message still present?

    1. If YES, continue with next step.
    2. If NO, go to step 6.

  5. Replace the L DCPC (A35).
  6. Do close out.

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