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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-MFD-3 BUS INPUT

Message Code:

B3-007202

Associated CAS:

None

Reporting LRU: MFD 2
System Description: 31-61-00
Schematic Diagram: 31-61-00
Wiring Diagram: 31-61-04
31-61-24

Message Description:

Left MFD data bus (L-MFD-3) is reported absent by the right MFD, while it is not reported absent by at least 2 of the following: left PFD, right PFD and right RIU.

Possible Causes:

  • Adaptive Flight-Display Unit 'A429 Input' (R MFD) (A28)
  • Junction Box 1 (JB1)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Removal of the Junction Box JB1 AMM 24-63-01-000-802
Installation of the Junction Box JB1 AMM 24-63-01-400-802
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
Wiring- Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-00-00-02

Troubleshooting Recommendations:

  1. Reset R MFD Circuit Breaker CB2-C5. Is the fault message still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  2. Swap R MFD (A28) with L MFD (A29). Is the fault message still present?

    1. If NO, do close out.
    2. If YES, continue with next step.

  3. Do wiring check between R MFD (A28), through JB1, and L MFD (A29) for the following wires:

    From: To: Result:
    Conn. A28P1- 70 Conn. A29P2 - 94
    Conn. A28P1 - 71 Conn. A29P2 - 95

    1. If the check is not satisfactory, repair defective wiring or replace defective JB1.
    2. If the check is satisfactory, continue with next step.

  4. Do close out.

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