Although it may well turn out to be the case, it is still an assumption that a
malfunctioning AoA vane induced MCAS-trim-response is involved in both incidents.
The Lion incident in particular is intriguing in terms of three things:
- the Captain repeatedly and successfully counteracting MCAS nose-down commands with electric trim but failing to activate the STAB TRIM CUTOUT.
- the Captain transferring control to the F/O while just barely managing to keep the aircraft in "level" flight himself.
- the apparently calm interactions of the crew with ATC.
This contrasts with what appears to have been the panicked response of the crew to the emergency encountered on ET602. It would appear that the two situations were quite different, or at least manifested in a significantly different way, or less likely (hopefully), the crew was not adequately briefed on how to correctly respond to a
malfunctioning AoA vane induced MCAS-trim-response.