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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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For AOG assistance contact:

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Quick Links

07/11/19

Message Overview:

Fault Message:

H STAB MOTOR #1/ACT/WRG FAULT

Fault Code:

27662221SX

Associated CAS:

STAB TRIM
(Caution)

SPLRS STAB BIT
(Advisory)

STAB CH1 FAIL
(Advisory)

Reporting LRU: Flight Control Unit (FCU) 1
System Description: 27-40-00
Schematic Diagram: 27-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 27-41-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]
27-41-03 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

There is a problem with the Motor Brake that could be detected either during flight or aircraft power-up.

Possible Causes:

  • Pitch Trim Actuator (PTA) Motor 1
  • Flight Control Unit (FCU) 1 (A65)
  • Pitch Trim Actuator (PTA) (B44)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

This fault may sometime be cleared by performing the flight control system reset procedure.

The pitch trim brake status can found in CAIMS:

  1. SYSTEM DIAG.
  2. 27-00 FLIGHT CONTROLS.
  3. FLIGHT CONTROL UNIT #1 and 2.
  4. LRU TEST.
  5. DISPLAY RUDDER TRAVEL LIM DATA.
  6. Go to page 5 of 8.

Quick Links:

Removal of the Pitch Trim Actuator AMM 27-41-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Pitch Trim Actuator AMM 27-41-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Pitch Trim Actuator-Motor AMM 27-41-13-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Pitch Trim Actuator-Motor AMM 27-41-13-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Flight-Control Units AMM 27-61-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Flight-Control Units AMM 27-61-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Check if the message H STAB MOTOR #1/ACT/WRG FAULT is reported by the FCU 1 and FCU 2.

    1. If YES, go to step 5.
    2. If NO, continue with next step.

  2. Swap FCU 1 with FCU 2.

    1. If system checks are good, replace FCU 1. Reset FCUs latched faults and do close out.
    2. If fault remains, continue with next step.

  3. If the fault is reported by the FCU 1, measure the impedance between the FCU 1 to the Motor 1. If the fault is reported by the FCU 2, measure the impedance between the FCU 2 to the Motor 1. Make sure the impedance is not less than 60 Ω for a short circuit to ground and not more than 90 Ω for an open circuit.

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

  4. Perform wiring checks between the FCU 1 to the motor 1.

    1. If wiring checks are not good, repair defective wiring as required and do close out.
    2. If wiring checks are good, continue with next step.

  5. Replace Pitch trim actuator motor 1.
  6. Do close out.

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