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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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03/29/21

Message Overview:

Message Name:

NO L-AHC-1 BUS INPUT

Message Code:

B3-008069

Associated CAS:

None

Reporting LRU: TCAS CH B
System Description: 34-43-00
Schematic Diagram: 34-43-00
Wiring Diagram: 34-43-01

Message Description:

L-AHC-1 bus data absent at TTRB and NOT absent at L-FGC and L-IOC; L-AHC is strapped.

Possible Causes:

  • Traffic Alert And Collision Avoidance System(TCAS) Processor (A5)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 5
  2. Comp Id = A005
  3. {Term Definitions}

    1. OPT1-40 XX 360 NA EXCT CSU WD-05 XXXX-XXXX XFXX-XXXT 09,15: AHC 1 STRAP
    2. TTRB-7 2X 350 00 EXCT XXXX-XXXX XXXX-XTXX XXXX-XXXX 350: 19;L-AHC-1 BUS INPUT
    3. FGC1-5 1X 071 01 EXCT XXXX-XXXT XXXX-XXXX XXXX-XXXX 071: 25;NO L-AHC-1 BUS INPUT
    4. AHC1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN;

Quick Links:

Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect a failed TTRB input, or wiring.

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