planecane wrote:maint123 wrote:planecane wrote:If anybody really wanted to do an MCAS off test without support from Boeing, they could do one of two things:
1) Get the aircraft stable and in trim before the maneuver that they want to evaluate. Turn off the electric trim with the cutout switches. Perform the desired maneuver and evaluate the results. You wouldn't be trimming in the middle of a turn anyway.
2) Perform a test flight with all electric trim on. Have the PNF (who would be a test pilot) listen for or watch the trim wheel and any time it starts to move in manual flight, flick the thumb switch very briefly for nose up trim to stop the MCAS cycle.
Mcas was incorporated for high AoA situations, not for level flight. Taking trials in level flight defeats the purpose of real life situations .
Suppose AoA is high and mcas again misbehaves, the pilot should be able to switch off mcas ,use the wheel solely and land the plane.
The trouble is that in the case of the Ethiopian crash , the pilots after switching mcas off ,couldn't manually fly the plane.
Many here questioned the skill level of the pilots.
So it's only logical that during a climb , with high AoA , the test pilots switch off mcas and manually land the plane.
It's like one engine failing during take off at near max thrust and the 2nd engine safely doing the job. Which is not a uncommon event.
The same level of reliance should be tested out on the mechanicals and aerodynamics of the max .
I get that. I'm talking about doing a test. The conditions that trigger MCAS are specific (and by this point known to regulators). They can use one of those methods to disable MCAS and put the aircraft into the conditions that normally trigger it to test the handling characteristics if they want to without help from Boeing.
Trimming with the manual wheel is irrelevant to that exercise.
I have to disagree. Trimming with the manual wheel is central to the exercise. That's what Boeing had recommended after the first crash and even the 2nd crash.
A situation can occur where the complete electricals are disabled by a short or something and the plane has to be flown solely by the manual wheel.