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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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03/30/21

Message Overview:

Message Name:

NO L-GP-4 BUS INPUT

Message Code:

B3-008126

Associated CAS:

None

Reporting LRU: WX RADAR CH A/B
System Description: 34-41-00
Schematic Diagram: 34-41-00
Wiring Diagram: 34-41-01

Message Description:

L-GP-4 data absent at WXRA and not L-GPS.

Possible Causes:

  • Weather Radar Transceiver (WXR) (A3)
  • Left Global Positioning (GPS)(A25)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Fault Confirmation Procedure:

  1. Message# = 10
  2. Comp Id = A003
  3. {Term Definitions}

    1. WXRA-3 1X 354 01 EXCT XXXX-XXXX XXXX-TXXX XXXX-XXXX 354A: 20;NO L-GP-4 INPUT
    2. GPS1-3 1X 355 01 EXCT XXXX-XXXX XXTX-XXXX XXXX-XXXX 355: 22;NO L-GPBUS-4 INPUT

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. Suspect a failed WXR L-GP-4 bus input, or wiring.

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