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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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Quick Links

03/16/21

Message Overview:

Message Name:

MLGWOW TSS DRV FAIL

Message Code:

B3-648413

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
34-43-01

Message Description:

PSEU Discrete Output DOT15A MLGWOW to TSS (A005) driver failed.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

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
Removal of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance
System (TSS) Transponder Unit		 AMM 34-43-03-000-801
Installation of the Traffic/Collision Avoidance System (TCAS) and Traffic Surveillance
System (TSS) Transponder Unit		 AMM 34-43-03-400-801
Standard Practices - Replace Wiring SPM 20-12-00-02
Standard Practices - Wire Repair SPM 20-12-10-02

Troubleshooting Recommendations:

  1. Reset PSEU / gear system circuit breakers CB1-C13, CB1-C14, CB2-C13 and CB2-C14. Is the fault message still present?

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

  2. Do wiring checkbetween the PSEU (A9) and the TSS (A238) for the following wire:

    To From Result
    Conn. A9CP1 - 10D A238BP1 - 4H

    1. If the check is satisfactory, continue with next step.
    2. If the check is not satisfactory, repair defective wire.
      NOTE: With the aircraft on ground (WOW) and the PSEU (A9) installed, there should be no continuity (open circuit) for this Discrete Output at the TSS (A238).

  3. Replace PSEU (A9).
  4. Do close out.

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