IIRC, the TCMA is fitted to ALL 787s regardless of fitted power plant. A similar system, TCMP, may be found on (some) 777s.
Hope the descriptions below help.
TCMA (B787)Thrust Control Malfunction Accommodation
Thrust Control Malfunction Accommodation is an EEC function that provides protection against idle thrust asymmetry conditions while on the ground.
The EEC commands shutdown of the affected engine when the:
- airplane is on the ground, and
- thrust lever is at idle, and
- engine is above idle speed and not decelerating normally
The EICAS caution message ENG FAIL (L or R) is displayed with an aural beeper once the engine falls below idle speed.
TCMP (B777) Thrust Control Malfunction Protection
The EEC provides protection against an uncontrolled high thrust malfunction during ground operation. The EEC shuts down the affected engine whe
- airplane is on ground,
- thrust lever is at idle, and
- engine is above idle speed and not decelerating normally.
The EICAS caution message ENG FAIL (L or R) is displayed when the engine falls below idle speed.
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Originally Posted by
NSEU
Folks... Is TCMA fitted to the 787 GEnx engine? The 787-8 Master MEL I have shows TCMA MEL's are applicable only to the RR (Trent 1000).
Does GE call it something else?
The ANA incident aircraft had Trents.
Thanks.