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Old 14th Jul 2021, 18:42
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tdracer
 
Join Date: Jul 2013
Location: Everett, WA
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Originally Posted by ETOPS
Sudden uncommanded acceleration........

https://nltimes.nl/2021/07/01/uncont...o-hospitalized
I suspected it might be that - what we called "UHT" (Uncontrollable High Thrust). Some failure causes the fuel control to lose control of the Fuel Metering Valve and it goes wide open.
FAA identified UHT on the ground (or at very low altitude during final) as potentially catastrophic - about all you can do is shut down the affected engine (and you need to react fast).
Newer Part 25 aircraft have mitigation. TCMA in the case of Boeing - Thrust Control Malfunction Accommodation - which (on ground only) will shut down an engine that's at high thrust and not responding with the throttle near idle. Unaware that anything has been done to address UHT for military aircraft.
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