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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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04/26/21

Message Overview:

Message Name:

HEADING BUG/SPEED BUG INTERMITTENT

Identifier: 221OBS004
Effectivity: AIRCRAFT: 20501 - 20999
System: Auto Flight
Associated CAS: None
System Description: 22-11-00
Schematic Diagram: 22-11-00
Wiring Diagram: 22-11-05

Message Description:

When auto flight system is switched to First Officer side, when moving heading bug / speed bug slowly, bug will go in opposite direction and become intermittent.

Possible Causes:

  • Flight Guidance Panel (FGP) (PL9)
  • Display Control Panel 1 (DCP) (PL7)
  • Display Control Panel 2 (DCP) (PL8)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of Flight Guidance Panel (FGP) AMM 22-11-05-000-801
Installation of Flight Guidance Panel (FGP) AMM 22-11-05-400-801
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Replace Flight Guidance Panel (PL9).
  2. Do close out.

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