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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:

MLGWOW SPC-CHB DRV FAIL

Message Code:

B3-007639

Associated CAS:

PROX SYS FAULT
(Advisory)

Reporting LRU: PSEU LRU
System Description: 32-60-00
Schematic Diagram: 32-61-00
Wiring Diagram: 27-32-05
32-61-09
32-61-12

Message Description:

PSEU Discrete Output DOT18B, MLGWOW to Stall Protection Computer Channel B (A178) driver failed.

Possible Causes:

  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Stall Protection Computer (SPC) (A178)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

PSEU discrete block diagram

Quick Links:

Removal of the Stall Protection Computer AMM 27-32-01-000-801
Installation of the Stall Protection Computer AMM 27-32-01-400-801
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).

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

  2. Do wiring check between SPC A178BP1 pin 27 and PSEU A9AP1 pin 6K. Repair as required.

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

  3. Replace PSEU.
  4. Do close out.

60_lh_cbpnl60_rh_cbpnlpseu_location

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