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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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03/15/21

Message Overview:

Message Name:

NO R GP-5 BUS INPUT

Message Code:

B3-007560

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 32-61-09

Message Description:

Right GP-5 bus not communicating to Proximity Sensor Electronic Unit. Verify Proximity Sensor Electronic Unit, Input/Output Concentrator (IOC), and aircraft wiring.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Input/Output Concentrator 2 (IOC 2) (A4-IOC2)
  • Junction Box 4 (JB4)
  • 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 Input/Output Concentrator Unit (IOC) AMM 31-45-05-000-801
Installation of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-400-801
Removal of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-000-801
Installation of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-400-801
Functional Test of the Proximity-Sensor Electronic Unit (PSEU) AMM 32-61-09-720-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Pull and reset the PSEU gear system breakers (CB1-C13, CB1-C14, CB2-C13, CB2-C14), recheck the system for the fault.

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

  2. Reset the circuit breakers R IAPS CB CB2-B6, then look for other failures related to the Input Output Concentrators, swap the IOCs.

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

  3. Check the ARINC 429 data bus from the PSEU A9AP1 PINS 10G, 9G through Junction Box 4 to IAPS A4P101 PINS 1, 2. Repair as required.

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

  4. Check the ARINC 429 data bus from the PSEU A9AP1 PINS 10G, 9G through Junction Box 4 to DCU A14EP1 PINS 1A, 1B. Repair as required.

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

  5. Replace JB4.

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

  6. Replace the PSEU.
  7. Functional test the PSEU.
  8. Do close out.

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