RickNRoll wrote:Revelation wrote:RickNRoll wrote:
It is not being submitted to the FAA till then. So that is when testing of a major, and highly sensitive, change starts with the FAA. That is not going to take a few weeks.
There are only so many tests they can come up with for the MCAS fix.
1) Verify MCAS disengages upon AoA disagree
2) Verify that if both AoA sensors fail within 5.5° of each other with high readings that:
a) Only one cycle occurs maximum
b) at Vmo the change in trim is limited so that the elevator had authority to maintain level flight
c) at Vmo the manual electric trim is capable of moving the stabilizer back into trim
d) using manual electric trim nose up stops the MCAS cycle
3) Test that the one cycle per event restriction doesn't keep MCAS from activating for a second event when conditions are met
4) Evaluate new (or updated) NNC to ensure that staying away from the MCAS required part of the flight envelope is reasonable.
5) Test stall recovery if MCAS is disabled and aircraft enters the conditions where it is needed and stalls.
I'm sure someone can come up with a few more but I wouldn't expect flight testing to take more than a few days.
A month should be very realistic as long as the software performs as planned. Evaluating the updated training may take longer than flight tests.