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

02/26/21

Message Overview:

Message Name:

FPU FAULT

Message Code:

B3-006786

Associated CAS:

FLAPS FAIL
(Caution)

Reporting LRU: FLAP POWER UNIT
System Description: 27-52-00
Schematic Diagram: 27-52-00
Wiring Diagram: 27-52-33

Message Description:

MessageFlap Power Unit (FPU) or wiring fault.

Possible Causes:

  • Flap Power Unit (FPU) (A123)
  • Flap Control Unit (FCU) (A124)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/ Service Bulletin:

  • AW300-27-0058 - Flap Control Unit - CAS Messages Reset procedure (20501 to 20999)

Forum Articles/Infoservice/Newsletter: None

In the MDC system parameters, an FPU PRESS XDCR SIGNAL showing 3740 PSI indicates the FCU have detected a malfunction in the system and do not send the excitation signal to the FPU pressure transducer.

MDC REPORT: SYSTEM PARAMETERS
FILENAME:
DATE:
...
FLAP SURFACE ANGLE - 3.74 DEG
FPU PRESS XDCR SIGNAL - 3740 PSI
APU HOURS - 1116.75 HRS
…

Source of the problem still has to be found.

Quick Links:

Removal of the Flap Control Unit (FCU) AMM 27-51-05-000-801
Installation of the Flap Control Unit (FCU) AMM 27-51-05-400-801
Operational Test of the Flap Control Unit (FCU) AMM 27-51-05-710-801
Removal of the Flap Power Unit (FPU) AMM 27-52-33-000-801
Installation of the Flap Power Unit (FPU) AMM 27-52-33-400-801
General Visual Inspection of the Flap Power Unit (FPU) AMM 27-52-33-210-801
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. Reset the following circuit breakers.

    FLAP R IND CB2-B12
    FLAP L IND CB1-B13
    FLAP CTRL CB1-B14

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Reset the FCU by pressing the FCU reset button on the MAINTENANCE TEST control-panel. If unable to reset, engage the Alternate Flaps button with the left hydraulic system pressurized, and attempt another reset using the Flap Reset switch on the left galley.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  3. Verify if current faults shows the FCU INTERNAL FAULT.

    1. If so, replace FCU per AMM.

      1. If system checks are good, do close out.
      2. If fault remains, continue with next step.

  4. Replace FPU.

    1. If system checks are good, do close out.

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