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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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Quick Links

04/26/21

Message Overview:

Message Name:

AP DISCONNECT WARNING FLAG

Identifier: 221OBS001
Effectivity: 20501 - 20999
System: Electrical
Associated CAS: None
System Description: 22-11-00
Schematic Diagram: 22-11-00
Wiring Diagram: 22-11-06

Message Description:

A red 'AP' warning flag will flash for 5 seconds then turn steady above the attitude sphere, indicates a monitored autopilot disconnect.

  • The warning may be accompanied by a yellow 'YD' caution Flag indicating a Yaw Damper Disconnect.

Possible Causes:

  • Flight Guidance Computer (FGC) (A4-FGC)
  • Integrated Avionics Processing System (IAPS) card cage (A4)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

Forum Articles/Infoservice/Newsletter: None

NOTE: Autopilot may disconnect for several reasons, using the FCS Diagnostics page for troubleshooting can help isolate the problem. Autopilot disconnect codes are displayed for system troubleshooting.

10_fgc_report_mode

Quick Links:

Removal of the Flight Guidance Computer (FGC) AMM 22-11-01-000-801
Installation of the Flight Guidance Computer (FGC) AMM 22-11-01-400-801
Operational Test of the Flight Guidance Computer (FGC) AMM 22-11-01-710-802
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. Cycle circuit breakers CB1-B7 (Left FGC) and CB2-B7 (Right FGC). Is the AP warning flag still displayed?

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

  2. Use the Flight Control System (FCS) Advanced Diagnostics page to obtain the "AP DIS" code. The FCS Advanced Diagnostics can be accessed via the Cursor Control Panel (CCP) by pressing the "A/ICE", "ECS" and "FLT" buttons.
  3. If the crew witnessed Pitch or Roll behavior on disconnect, you may refer to the following CAS message troubleshooting pages.

    1. AP HOLDING NOSE UP
    2. AP HOLDING NOSE DOWN
    3. AP HOLDING LWD
    4. AP HOLDING RWD

  4. If a flight is required to duplicate the issue, it is recommended that the crew record the aircraft flying characteristics under full fuel conditions (8500 lbs) using the Aileron Trim & Control Worksheet.
  5. Swap the FGCs. Does the AP warning flag follow?

    1. If YES, replace bad FGC.
    2. If NO, continue with next step.

  6. Replace the IAPS (A4) card cage.
  7. Do close out.

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