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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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03/24/21

Message Overview:

Message Name:

NO L-AHC-2 BUS INPUT

Message Code:

B3-007175

Associated CAS:

None

Reporting LRU: MFD 1
System Description: 31-61-00
Schematic Diagram: 31-61-00
Wiring Diagram: 31-61-03

Message Description:

L-AHC-2 data absent at L-MFD and L-PFD is OFF.

Possible Causes:

  • Attitude Heading Computer (AHC) (A11)
  • Adaptive Flight-Display Unit (MFD) (A29)
  • Adaptive Flight-Display Unit (PFD) (A27)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. ATA Chapter = 34-25
  2. Message# = 15
  3. {Term Definitions}

    1. MFD1-22 1X 351 NA EXCT XXXX-XXXX XXXX-XXXX XXTX-XXXX 351: 14;NO L-AHC-2 INPUT
    2. PFD1-1 1X 350 NA ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

Quick Links:

Removal of the Adaptive Flight-Display Unit AMM 31-61-01-000-801
Installation of the Adaptive Flight-Display Unit AMM 31-61-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Equ Note = L-MFD RVSN; L-PFD OFF
  2. Suspect failed L-AHC-2 output, failed L-MFD or L-PFD input, or wiring. Verify L PFD is OFF or REVERTED.

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