background
x
loader
Troubleshooting
arrow By ATA By Message Color By Observed Faults by MDCBy Tips

Select color for CAS message that you wish to troubleshoot

(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.

This page includes :

For AOG assistance contact:

CRC Montreal (YUL)
Quick Links

02/25/21

Message Overview:

Message Name:

HYD GEN GCU TEST FAIL
(Service Message)

Message Code:

B3-345658

Associated CAS:

None

Reporting LRU: HYD GEN GCU
System Description: 24-33-00
Schematic Diagram: 24-33-00
Wiring Diagram: 24-33-01
24-33-03

Message Description:

The Hydraulic-Motor Driven Generator Control Unit has failed during the Maintenance Test.

Possible Causes:

  • Generator Control Unit (GCU) - Emergency (HMDG GCU) (A206)
  • Hydraulic-Motor Driven Generator (HMDG) (G4)
  • Remote Data Concentrator Unit (RDC) (A13)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • SB100-24-04 - MODIFICATION - EMERGENCY DC-POWER SYSTEM - Installation of the Hydraulic Motor Driven Generator (HMDG) Option (C24-300)

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:
  • Retry, via the Forward Maintenance Panel, by setting the Maintenance Test Switch at the HYD GEN position and pushing / holding it for at least 5 seconds.
  • Monitor the MDC Current Service Message page.

Quick Links:

Removal of the Hydraulic-Motor Driven Generator AMM 24-33-01-000-801
Installation of the Hydraulic-Motor Driven Generator AMM 24-33-01-400-801
Removal of the Generator Control Unit (GCU) - Emergency AMM 24-33-09-000-801
Installation of the Generator Control Unit (GCU) - Emergency AMM 24-33-09-400-801
Removal of the Remote Data Concentrator (RDC) AMM 31-41-05-000-802
Installation of the Remote Data Concentrator (RDC) AMM 31-41-05-400-802
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Do wiring check as per the following table:

    From To Results
    HMDG GCU conn. A206P2 - A HMDG conn. G4P4 - pin 1
    HMDG GCU conn. A206P2 - B HMDG conn. G4P4 - pin 2
    HMDG GCU conn. A206P2 - K HMDG conn. G4P5 - pin C
    HMDG GCU conn. A206P2 - Y HMDG conn. G4P5 - pin F
    HMDG GCU conn. A206P2 - Z Aircraft Ground
    HMDG GCU conn. A206P1 - D HMDG conn. G4P5 - pin B
    HMDG GCU conn. A206P1 - C HMDG conn. G4P5 - pin A
    HMDG GCU conn. A206P1 - R Aircraft Ground
    HMDG GCU conn. A206P1 - X Aircraft Ground
    HMDG GCU conn. A206P2 - G RDC conn. A13EP1 - pin 6J
    HMDG GCU conn. A206P2 - H RDC conn. A13EP1 - pin 6K
    HMDG GCU conn. A206P1 - P RDC conn. A13FP1 - pin 6H

    1. If the check is not satisfactory, repair/replace the defective wiring.
    2. If the check is satisfactory, continue with next step.

  2. Replace the HMDG GCU (A206). Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  3. Replace the HMDG (G4). Is the fault still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  4. Replace the RDC (A13).
  5. Do close out.

Registered and/or unregistered trademarks of Bombardier Inc. or its subsidiaries. © 2015 Bombardier Inc. All rights reserved.