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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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CRC Montreal (YUL)
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02/18/21

Message Overview:

Message Name:

NO L-CDU-7 BUS INPUT

Message Code:

B3-006838

Associated CAS:

None

Reporting LRU: HF 2
System Description: 23-12-00
Schematic Diagram: None
Wiring Diagram: 23-12-01

Message Description:

L-CDU-7 data absent at R-HF and NOT 3-of (L-IOC, R-TDR, R-NAV, R-VHF); 1 FMC/1 CDU strapped.

Possible Causes:

  • Right HF Radio (HF) (A62)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 6
  2. Comp Id = A062
  3. Fault Logged = AIR,TAXI
  4. Status = FAILED/WIRING
  5. {Term Definitions}

    1. OPT1-31 XX 360 NA EXCT CSU WD-04 XXXX-XXXX XXXX-XFFT 9,10,11: 1 FMC/1 CDU STR
    2. HF2-1 2X 351 10 EXCT XXXX-XXXX XXXX-XXXX XXXX-XTXX 351 :11;NO R-CDU-6/L-CDU-7 INPUT
    3. CDU1-1 1X 350 01 ABSN XXXX-XXXX XXXX-XXXX XXXX-XXXX 350: (A) NO IOC 1X IN
    4. TDR2-4 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 350: 16;NO R-CDU-6/L-CDU-7 BUS IN
    5. NAV2-4 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 057A: 15;NO R-CDU-6/L-CDU-7 IN
    6. VHF2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 057: 15;NO R-CDU-6/L-CDU-7 INPUT

Quick Links:

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

Troubleshooting Recommendations:

  1. Suspect failed R-HF input or wiring.
  2. Not incl: R-DME.
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