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Originally Posted by GogglesPisano
(Post 3393503)
Yes. We practiced this in the sim -- after a 20 minute brief including a powerpoint showing the position of the jackscrew relative to the stab axis and the forces from the elevator. There is no way we could have figured this out in 10s.
Control column............................................ .....Hold firmly Autopilot (if engaged).......................................... .Disengage Autothrottle (if engaged)........................................Di sengage Control column and thrust levers..........................Control airplane pitch attitude and airspeed Main Electric Stabilizer trim.............................................R educe control column forces If the runaway stops after the autopilot is disengaged: Do not re-engage the autopilot or autothrottle. ---- If the runaway continues after the autopilot is disengaged: STAB TRIM CUTOUT switches (both)............................................ ....CUTOUT If the runaway continues: Stabilizer trim wheel........................................Grasp and hold |
Originally Posted by Texasbound
(Post 3393529)
Wow, so after all that training you don't realize that using the manual wheel is at the end of the checklist? If you start the memory items withing 10 seconds you will not be wildly out of trim when doing the last part. It's called flying.
Control column............................................ .....Hold firmly Autopilot (if engaged).......................................... .Disengage Autothrottle (if engaged)........................................Di sengage Control column and thrust levers..........................Control airplane pitch attitude and airspeed Main Electric Stabilizer trim.............................................R educe control column forces If the runaway stops after the autopilot is disengaged: Do not re-engage the autopilot or autothrottle. ---- If the runaway continues after the autopilot is disengaged: STAB TRIM CUTOUT switches (both)............................................ ....CUTOUT If the runaway continues: Stabilizer trim wheel........................................Grasp and hold |
Until one has flown overseas, they'll have a difficult time understanding many things about these two crashes. It is a completely different world out there. Everything is based on autopilot. When doing a V1 cut, the very first item you do is turn the autopilot on at 400'. Before doing any checklist or memory items... autopilot first. When doing a visual approach, it requires to be programmed and both pilots will without fail be heads down trying to program it instead of turning off the auto-magic and flying the plane and uncoupled visual approach is practically an emergency maneuver. Autothrottle doesn't work or does something unexpected? They'll fly it right into a stick shaker and blame Boeing - see Asiana in SFO.
It's a different world out there. But careful, some of our progressive friends may call you some kind of an *ist or *phobe for even suggesting that. |
Originally Posted by Hedley
(Post 3393540)
That’s also a revised procedure that came out after the crashes. I don’t remember what it was before.
ATC MEMES |
Originally Posted by Texasbound
(Post 3393529)
Wow, so after all that training you don't realize that using the manual wheel is at the end of the checklist? If you start the memory items withing 10 seconds you will not be wildly out of trim when doing the last part. It's called flying.
Control column............................................ .....Hold firmly Autopilot (if engaged).......................................... .Disengage Autothrottle (if engaged)........................................Di sengage Control column and thrust levers..........................Control airplane pitch attitude and airspeed Main Electric Stabilizer trim.............................................R educe control column forces If the runaway stops after the autopilot is disengaged: Do not re-engage the autopilot or autothrottle. ---- If the runaway continues after the autopilot is disengaged: STAB TRIM CUTOUT switches (both)............................................ ....CUTOUT If the runaway continues: Stabilizer trim wheel........................................Grasp and hold |
Originally Posted by CBreezy
(Post 3393439)
The problem with the MCAS crashes was poor technique and late recognition from the pilot perspective. In the second crash, the crew actually hit the stab trim cutout switches. The problem was, the nose down forces were so great, they couldn't manually crank the trim. You actually have to unload the stab to be able to crank the trim wheel. This requires a kind a porpoising. And even then, it takes something like 40-50 turns to get it back to something manageable.
The second crew couldn't turn the trim wheel and the airplane was on the the verge of out of control. So they turned the electric trim back on. To your last questions: yes it spins. Yes you can use trim to temporarily cut out the MCAS and yes you could theoretically grasp the wheel. Not sure how effective that would be but it is in the memory item. Why I think it takes so long to recognize is, the 737 actually has a system that trims the aircraft for you on departure so it's actually common to have that wheel spinning on its own as you are pulling flaps up and accelerating. I don’t get it. Is it not natural pilot nature to trim back against control forces that are pulling the yoke out of your hands in the nose down direction? |
Originally Posted by CBreezy
(Post 3393552)
Have you done it? The trim doesn't stop when you start the checklist and 10 seconds of running trim is going to cause significant stab forces to maintain straight and level. And by the way, prior to the accidents, the stab trim cutout occured after the first "if runaway continues." And there was no discussion of a technique on how to use the trim wheel or a discussion of unloading the flight controls as the ONLY method of manually trimming in a recovery from a runaway
There had not been a runaway stab in many years. SWA didn't even have it as a memory item anymore, but they were still expected to know it. The Stab Trim cutout did occur after the first "if runaway continues", but I bet you never read the notes. It still told you to trim before turning them off. |
Originally Posted by WHACKMASTER
(Post 3393555)
All correct, but it is not common to have the SPEED TRIM system trying to pull the yoke out of your hands.
I don’t get it. Is it not natural pilot nature to trim back against control forces that are pulling the yoke out of your hands in the nose down direction? For example, I like to see that the airplane is doing. As you go from flaps down to flaps up and as you accelerate, constant trim changes occur. Sometimes I don't trim it out right away because I know after acceleration height, the trim required to go from flaps 5 to zero will be cancelled out somewhat by the trim required to go from 180-250. And I like to see what the speed trim is going to do. So no, I'm not always in perfect trim. |
Originally Posted by DeltaboundRedux
(Post 3393087)
“This airplane is designed by clowns, who are in turn supervised by monkeys"
That's really all you need to know about the Boeing corporate culture, and the employee's there knew it. But I'm sure that's all fixed now, so fly with confidence. If it's Boeing, it's going. Ready or not. The only clown he is worried about now if the one from the FAA that testified against him yesterday. |
Originally Posted by Texasbound
(Post 3393556)
Yes, I have done it... to include step 4 and 5. Step 5 has you retrim before turning the switches off. If you do it wrong you have to work harder, but the plane is controllable, unless you skipped step 4 as well.
There had not been a runaway stab in many years. SWA didn't even have it as a memory item anymore, but they were still expected to know it. The Stab Trim cutout did occur after the first "if runaway continues", but I bet you never read the notes. It still told you to trim before turning them off. |
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