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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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03/19/21

Message Overview:

Message Name:

NO L-CDU-7 BUS OUTPUT

Message Code:

B3-006422

Associated CAS:

None

Reporting LRU: CDU 1
System Description: 34-61-00
Schematic Diagram: 34-61-00
Wiring Diagram: 34-61-03
34-61-07

Message Description:

No L-CDU-7 data received at 2-of (R-NAV, R-DME, R-VHF, R-TDR) AND only 1 FMS/1 CDU strap. Not incl: R-HF. Output Pins are 65 and 36.

Possible Causes:

  • Right Control Display Unit (CDU) (Installation with Dual CDUs) (A68)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. LRU = CDU1 CDU 1
  2. ATA Chapter = 34-61
  3. Comp Id = A068
  4. Message = NO L-CDU-7 BUS OUTPUT
  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. NAV2-4 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 057A: 15;NO R-CDU-6/L-CDU-7 IN
    3. DME2-5 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 057: 15;NO R-CDU-6/L-CDU-7 IN
    4. VHF2-3 2X 057 10 EXCT XXXX-XXXX XXXX-XXXX XTXX-XXXX 057: 15;NO R-CDU-6/L-CDU-7 INPUT
    5. TDR2-4 2X 350 10 EXCT XXXX-XXXX XXXX-XXXX TXXX-XXXX 350: 16;NO R-CDU-6/L-CDU-7 BUS IN

Quick Links:

Removal of the Control Display Unit (CDU) AMM 34-61-05-000-801
Installation of the Control Display Unit (CDU) AMM 34-61-05-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Suspect wiring or CDU. Output Pins are 65 and 36.

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