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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:

COPILOT MAN TRIM SW

Message Code:

B3-006864

Associated CAS:

STAB TRIM FAULT
(Advisory)

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

Message Description:

Copilot Manual Trim Switch fault detected by Horizontal Stabilizer Electronic Control Unit (HST ECU).

Possible Causes:

  • Trim Switch
  • Horizontal Stabilizer Trim Electronic Control Unit (HST ECU) (A130)
  • 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

NOTE: During wiring checks reference BD-100 Schematic Manual 27-41-00 page 1 to aid in ring-out.

Quick Links:

Removal of the Pitch/Roll Trim Switch AMM 27-41-01-000-801
Installation of the Pitch/Roll Trim Switch AMM 27-41-01-400-801
Operational Test of the Pitch/Roll Trim Switch AMM 27-41-01-710-801
Removal of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-000-801
Installation of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-400-801
Operational Test of the Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) AMM 27-41-21-710-801
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. Remove HST ECU from rack. Check HST ECU connector A130BP1 pins 2B, 2K should both only have a ground when switch is in the nose down position; A130BP1 pins 2A, 2J should only have a ground when the switch is in the nose up position and A130BP1 pins 2D, 2G should only have a ground when the arm switch is pressed.

    1. If checks are normal, go to step 4.
    2. If any anomalies are noted, continue with next step.

  2. Perform wiring check between cockpit control column disconnect P/J150, JB3 and HST ECU.

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

  3. Replace S85 pilot Pitch/Roll trim switch.

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

  4. Replace HST ECU.

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

  5. Replace JB3.
  6. Do close out.

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