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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:

CRC Montreal (YUL)
Quick Links

07/10/19

Message Overview:

Fault Message:

HST MDU[CH1]/ACTUATOR FAULT

Fault Code:

27662241SX

Associated CAS:

STAB TRIM
(Caution)

SPLRS STAB BIT
(Advisory)

STAB CH1 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:

Channel 1 of Flight Control Unit 1 or 2 reported small creeping from the Pitch Trim Actuator or small creeping from the Motor Drive Unit (MDU).

Possible Causes:

  • Pitch Trim Actuator Motor Drive Unit (MDU) (A184)
  • Pitch Trim Actuator (B44)
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter: None

The present MDU-5 is known to be susceptible to nuisance coasting if there is a fast trim cycle of NOSE-UP or NOSE-DOWN.

To prevent unnecessary troubleshooting and component removal after an occurrence of this phenomenon, it is recommended to do Flight Control System reset procedure before the next flight to determine if the SPLRS STAB BIT advisory message shows. If this message still show after the reset procedure, it is necessary to do troubleshooting. If during subsequent flights a SPLRS STAB BIT message shows more than once in 10 flight legs, we suggest that operators record the CAIMS flight fault history for FCU #1, if the faults reported is:

  • H STAB MTR DR UNIT [CH1]/WRG FAULT

It may be necessary to replace the motor drive unit.

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 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 ]
Wire Repair - Maintenance Practices - ALL SPM 20-12-10-02 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Troubleshooting Recommendations:

  1. Perform Flight Control Systems reset procedure.

    1. If system checks are good, do close out.
    2. If fault remains (same CAIMS fault message), continue with next step.

  2. Replace Motor Drive Unit.

    1. If system checks are good, do close out.
    2. If fault remains (same CAS and CAIMS messages), continue with next step.

  3. Replace Pitch Trim Actuator.
  4. Do close out.

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