It’s being reported on news wires that Boeing expects to submit the 737MAX modified software by the end of September for recertification.
The changes will involve both flight computers being used – normally one is used on one flight and the other on the next flight, and they rotate continuously.
This new issue, separate to the MCAS problem, was identified by the FAA during a simulator test.
Under a scenario where a specific fault in a microprocessor caused an uncommanded movement of the plane’s horizontal tail, it took pilots too long to recognise a loss of control known as runaway stabiliser.
It’s this issue that will now require both computers.
In the meantime two airlines already (Southwest & American) have put off reintroduction of the type until 2020, with more expected to follow.