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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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04/09/25

Message Overview:

Message Name:

FGC USING STBY AIR SPEED

Message Code:

B3-280281

Associated CAS:

None

Reporting LRU: FGC 1
System Description: 22-11-00 - Automatic Flight-Control System (AFCS)
Schematic Diagram: None
Wiring Diagram: None

Message Description:

The left FGC is using the Standby airspeed due to the lost of its primary source of airspeed from the L ADC.

Possible Causes:

  • Left-Air Data Computer (ADC 1) (A1)
  • Left-Input/Output Concentrator Unit (IOC) (A4-IOC)
  • Flight Guidance Computer (FGC) (A4-FGC)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Full Throttle Blog/Forum Articles/Infoservice/Newsletter: None

Flight Operation Notifications Manual (FONM): None 

Quick Links:

Standard Aircraft Configuration for Maintenance AMM 12-00-00-867-803
Cleaning Safety Precautions AMM 12-21-00-910-801
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
Removal of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-000-801
Installation of the Integrated-Avionics Processor System (IAPS) Card Cage (ICC) AMM 31-45-01-400-801
Removal of the Air Data Computer AMM 34-13-01-000-801
Installation of the Air Data Computer AMM 34-13-01-400-801

Troubleshooting Recommendations:

  1. Suspect problem with the L-ADC, L-IOC or L-ADC-1 wiring. FGC is very likely not the failed device.

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