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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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02/26/21

Message Overview:

Message Name:

NO PSEU CHANNEL B INPUT

Message Code:

B3-006874

Associated CAS:

STAB TRIM FAULT
(Advisory)

Reporting LRU: HORIZ TRIM ECU
System Description: 27-41-00
32-60-00
Schematic Diagram: 27-41-00
Wiring Diagram: 27-41-21
32-61-09

Message Description:

Proximity Sensor Electronics Unit (PSEU) Channel B input fault detected by Horizontal Stabilizer Electronic Control Unit (HST ECU).

Possible Causes:

  • Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
  • Proximity-Sensor Electronic Unit (PSEU) (A9)
  • Right Input/Output Concentrator (R IOC) (A4-IOC2)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin:

  • AW300-27-0081 - Spoiler Electronic Control Unit (SECU) and Horizontal Stabilizer Electronic Control Unit (HSTECU) - Cold Temperature Circuit Breaker Reset Procedure (20501 - 20999)

Forum Articles/Infoservice/Newsletter: None

Performed the AW300-27-0081 reset procedure for the HST ECU if the message is displayed during initial power-up in cold temperature. The stab trim position indication on EICAS can also flash on and off. Check if there is other MDC equation related to proximity sensor.

Quick Links:

Removal of the Horizontal Stabilizer-Trim Actuator (HSTA) AMM 27-41-05-000-801
Installation of the Horizontal Stabilizer-Trim Actuator (HSTA) AMM 27-41-05-400-801
Operational Test of the Horizontal Stabilizer-Trim Actuator (HSTA) Full Range Trimming AMM 27-41-05-710-801
Functional Test of the HSTA Torque Limiter AMM 27-41-05-720-801
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
Operational Test of the Input/Output Concentrator Unit (IOC) AMM 31-45-05-710-801
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
Wiring - Maintenance Practices - ALL SPM 20-12-00-02
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02
Electrical Connectors - Maintenance Practice - ALL SPM 20-20-00-02

Troubleshooting Recommendations:

  1. Pull the HST ECU breaker CB1 - B15, and CB2 - B13, reset after a couple seconds. This will re-boot the HST ECU.

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

  2. Do wiring checks (data bus) between PSEU, HST ECU, JB1 and JB2. Repair as required.

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

  3. Swap IOCs.

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

  4. Replace PSEU.

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

  5. Replace HST ECU.
  6. Do close out.

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