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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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03/31/21

Message Overview:

Message Name:

NO WXT-1 BUS TO MFD1

Message Code:

B3-539869

Associated CAS:

None

Reporting LRU: WXR RTA
System Description: 34-41-00
Schematic Diagram: 34-41-00
Wiring Diagram: 34-41-01

Message Description:

WXT-1 bus data absent at the Left MFD.

Possible Causes:

  • Weather Radar Receiver/Transmitter and Antenna (A3)
  • Left Multi-Function Flight Display (MFD1) (A29)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/ Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

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
Removal of the Weather Radar Receiver/Transmitter and Antenna AMM 34-41-01-000-801
Installation of the Weather Radar Receiver/Transmitter and Antenna AMM 34-41-01-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Repair Wiring SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset WX (CB1-A8) circuit breaker.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.

  2. Swap PFDs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  3. Swap MFDs.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  4. Do a wiring check of the ARINC 708 data bus WXT-1 from WXR RTA connector A3P1 to L PFD connector A27P1. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  5. Do a wiring check of the ARINC 708 data bus WXT-1 from L PFD connector A27P1 to L MFD connector A29P1. Repair/replace as required.

    1. If system check passes, do close out.
    2. If fault remains, continue with next step.

  6. Replace WXR RTA.
  7. Do close out.

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