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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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07/17/19

Message Overview:

MACH TRIM FAIL
(Caution)

DDG Reference: None
Pilot Action (QRH): ABNORM 8-4
System Description: 27-41-00
Schematic Diagram: 27-41-00 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wiring Diagram: 27-41-01 [ Global Express ]  [ G5000 ]  [ Global XRS ]

Fault Description:

FCU does not receive the Mach data. The Mach trim function is lost and will not adjust the pitch when there is Mach changes. On ground, this message also occurs with the failure of two pitch-trim position-transducers.

Possible Causes:

  • At least two MADCs are defective
  • Mach data is invalid (Mach Transducer or IESI defective)
  • HST control angle is invalid (electrical or mechanical failure of one HST RVDT)
  • Pitch-Trim Actuator Electrical-Module
  • One FCU is defective
  • Associated Wiring

Troubleshooting Tips:

Advisory Wire/Service Bulletin: None

Forum Articles/Infoservice/Newsletter:To support a NFF technical investigation please fill out this Questionaire and send it to your FSR if you are replacing an Flight Control Unit (FCU).

Quick Links:

Removal of FCU AMM 27-61-05-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of FCU AMM 27-61-05-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Pitch Trim Actuator AMM 27-41-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Pitch Trim Actuator AMM 27-41-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Removal of Micro Air Data Computers AMM 34-11-09-000-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Installation of Micro Air Data Computers AMM 34-11-09-400-801 [ Global Express ]  [ G5000 ]  [ Global XRS ]
Wire Repair SPM 20-12-10 [ Global Express ]  [ G5000 ]  [Global XRS ]

Troubleshooting Recommendations:

  1. Select related CAIMS message below:

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