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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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Quick Links

07/04/19

Message Overview:

Fault Message:

HORIZ STAB ACTUATOR / WRG FAULT

Fault Code:

27655200SX

Associated CAS:

STAB TRIM
(Caution)

SPLRS STAB BIT
(Advisory)

STAB CH1 FAIL
(Advisory)

STAB CH2 FAIL
(Advisory)

Reporting LRU: Flight Control Unit (FCU)
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 ]

Fault Description:

Single Flight Control Unit (FCU) Channel recorded a fault with the actuator wiring or the related components.

Possible Causes:

  • Motor Drive Unit (MDU) (A184)
  • Horizontal Stab Trim Actuator (HST) (B44)
  • Flight Control Unit (FCU) 1 (A65)
  • Flight Control Unit (FCU) 2 (A66)
  • 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. If the message comes back more then once within 10 flight legs, troubleshooting is required.

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 ]
Visual Check of the Pitch Trim Actuator AMM 27-41-09-210-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of the Pitch-Trim Actuator-Motor Drive-Unit AMM 27-41-17-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of the Pitch-Trim Actuator-Motor Drive-Unit AMM 27-41-17-400-801 [ 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. Swap the FCUs and confirm that they are installed properly and securely.
    NOTE: Fault will only show on one FCU.

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

  2. Replace Motor Drive Unit.

    1. If system checks are good, do close out.
    2. If fault remains, continue with next step.
      NOTE: Ground support Equipment 27X-41-09 "MDU INVERTING HARNESS" can be used to isolate the fault to the MDU or pitch trim Actuator. Prior to replacement of units.

  3. Perform wiring checks between FCU and MDU & HSTA.

    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.
      Fault reported by the FCU 1:

      From To Result
      A65BP1-15E A184P3-17
      A65BP1-15F A184P3-16
      A65EP1-15B A184P4-A
      A65EP1-14J B44P2-8
      A65EP1-15J B44P2-9
      A65BP1-14C B44P2-6
      A65BP1-15C B44P2-5

      Fault reported by the FCU 2:

      From To Result
      A66BP1-15E A184P7-17
      A66BP1-15F A184P7-16
      A66EP1-15B A184P8-A
      A66EP1-14J B44P4-8
      A66EP1-15J B44P4-9
      A66BP1-14C B44P4-6
      A66BP1-15C B44P4-5

  4. Perform a visual inspection of the pitch trim actuator as per AMM.

    1. If AMM inspection procedure fix the fault, do close out.
    2. If not, continue with next step.

  5. Replace Pitch Trim Actuator.
  6. Do close out.

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