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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:

OPEN/SHORT MOTOR

Message Code:

B3-006887

Associated CAS:

STAB TRIM FAULT
(Advisory)

Reporting LRU: H-TRIM PRIM MOTR
System Description: 27-41-00
Schematic Diagram: 27-41-00
Wiring Diagram: 27-41-21

Message Description:

The Horizontal Stabilizer Electronic Control Unit (HST ECU) has detected a Primary Motor fault.

Possible Causes:

  • Motor
  • Motor Control Unit (MCU) (A131)
  • Horizontal-Stabilizer-Trim Electronic-Control Unit (HST ECU) (A130)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

Quick Links:

Operational Test of the Rudder Travel Limiter Actuator AMM 27-21-28-710-801
Electrical Rigging of the Rudder Travel Limiter Actuator AMM 27-21-28-820-801
Operational Test of the Pitch Trim System AMM 27-41-00-710-801
Functional Test of the Pitch Trim System AMM 27-41-00-720-801
Electrical Rigging of the Pitch Trim System AMM 27-41-00-820-801
Rigging Check of the Pitch Trim System AMM 27-41-00-220-801
Removal of the Motor and Brake Unit AMM 27-41-09-000-801
Installation of the Motor and Brake Unit AMM 27-41-09-400-801
Removal of the Motor Control Unit (MCU) AMM 27-41-13-000-801
Installation of the Motor Control Unit (MCU) AMM 27-41-13-400-801
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
Removal of the Spoiler Electronic-Control Unit (SECU) AMM 27-61-05-000-801
Installation of the Spoiler Electronic-Control Unit (SECU) AMM 27-61-05-400-801
Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) AMM 27-61-05-820-801
Electronic Rigging of the Spoiler Electronic-Control Unit (SECU) AMM 27-61-05-820-802
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. Re-rig the pitch trim system.

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

  3. Do wiring checks between #1 motor wiring, Motor Control Unit and Horizontal Stab #1 motor. Repair as required.

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

  4. Do wiring checks between HSTA primary motor and HST ECU. Repair as required.

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

  5. Do wiring checks between HSTA primary motor and MCU. Repair as required.

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

  6. Do wiring checks between HST ECU and MCU. Repair as required.

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

  7. Check Motor coil values. Pins D to A, D to B = 0.16 to 0.20Ω.

    1. If resistance is out of tolerance, go to step 13.
    2. If resistance is within tolerance, continue with next step.

  8. Check RVDT primary winding resistance values. Pins 7 to 8 = 30 to 40Ω.

    1. If resistance is out of tolerance, go to step 13.
    2. If resistance is within tolerance, continue with next step.

  9. Check RVDT Secondary winding values. Pins 9 to 10, Pins 10 to 11, and Pins 11 to 9 = 113 to 150Ω.

    1. If resistance is out of tolerance, go to step 13.
    2. If resistance is within tolerance, continue with next step.

  10. Check RVDT Excitation values at Pins 7 to 8 = approximately 5 VAC.

    1. If voltage is out of tolerance, go to step 14.
    2. If voltage is within tolerance, continue with next step.

  11. Swap relay K44 with relay K45.

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

  12. Replace HST ECU.

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

  13. Replace Primary motor.

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

  14. Replace MCU.
  15. Do close out.

60_lh_cbpnl60_rh_cbpnl40_motor_control_unit40_stab_actuator_installation

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