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

04/26/21

Message Overview:

Message Name:

FGP/SERVOS CB1-B7/CB2-B7 TRIPPING

Identifier: 221OBS002
Effectivity: AIRCRAFT: 20501 - 20999
System: Auto Flight
Associated CAS: None
System Description: 22-11-00
Schematic Diagram: 22-11-00
Wiring Diagram: 22-11-17
22-11-21

Message Description:

The FGP/Servos CB1-B7 or CB2-B7 is tripping when AP is engaged.

Possible Causes:

  • Aileron Servo (A126)
  • Elevator Servo (A125)
  • Flight Guidance Panel (FGP) (PL9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Flight Guidance Panel (FGP) AMM 22-11-05-000-801
Installation of the Flight Guidance Panel (FGP) AMM 22-11-05-400-801
Removal of the Aileron Servo Mount AMM 22-11-09-000-801
Installation of the Aileron Servo Mount AMM 22-11-09-400-801
Removal of the Elevator Servo Mount AMM 22-11-13-000-801
Installation of the Elevator Servo Mount AMM 22-11-13-400-801
Removal of the Aileron Servo AMM 22-11-17-000-801
Installation of the Aileron Servo AMM 22-11-17-400-801
Removal of the Elevator Servo AMM 22-11-21-000-801
Installation of the Elevator Servo AMM 22-11-21-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Check to see if the Aileron or Elevator Servo is shorted by removing the FGP and accessing connectors PL9P1 and PL9P2.
  2. Perform continuity check on following wires:

    Servo Clutch From: To: Expected
    Results:    		 Actual
    Results:
    Elevator Servo Clutch (A125 pin M) PL9P1 pin k PL9P1 pin P Chassis GND ≈ 36Ω
    Aileron Servo Clutch (A126 pin E) PL9P2 pin k PL9P2 pin P Chassis GND ≈ 36Ω

    1. If continuity check fails, replace the corresponding failed Servo.

      1. Reset CB1-B7 if Elevator Servo was replaced.
      2. Reset CB2-B7 if Aileron Servo was replaced.

  3. Do close out.

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