From 'tartare' cited PDF above:
F-35 Lightning II Cockpit Vision 19 Oct 2010 Michael Skaff
https://www.fujitsu.com/downloads/MI...10-01-2330.pdf (0.7Mb)
"...In the unlikely event of catastrophic engine failure in hover mode the F-35 is equipped with an automatic ejection seat.
This feature is only armed and available at the extremes of the vertical landing envelope. At first thought an auto-eject function seems extreme to most pilots, but once they are made aware of the time critical urgency and the total inability of the human to command a manual ejection during low altitude hover, most are thankful for this capability. This is a clear example of letting the computer do what computers do best...."