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Forum: Tech Log

30th Mar 2019, 06:00

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

The certification requirements for military...

The certification requirements for military aircraft are very different from passenger aircraft. MCAS may have been acceptable for the KC-46 tanker, but not for the closely related B767 passenger...

Forum: Tech Log

29th Mar 2019, 18:54

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

Your post is correct in almost every respect. The...

Your post is correct in almost every respect. The difference hinges about the meaning of 'reset', which is not actually important in the context of this discussion. I did not go into details about...

Forum: Tech Log

29th Mar 2019, 15:39

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

This was discussed previously. Apparently turning...

This was discussed previously. Apparently turning off power to the aircraft always resets MCAS to the captain's side AOA. The next flight carried out would then alternate the AOA side as you...

Forum: Tech Log

29th Mar 2019, 11:54

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

IFixPlanes Point taken, and thanks for the...

IFixPlanes

Point taken, and thanks for the diagram! I do not recall seeing that posted on this forum before.

I bet the pilots would have had fun studying that diagram, both during training, and...

Forum: Tech Log

29th Mar 2019, 06:50

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

I think it is clearer to say that the MCAS...

I think it is clearer to say that the MCAS control signals run from the flight control computers to the stabiliser trim through a different circuit. This follows so that MCAS trim is not overridden,...

Forum: Tech Log

26th Mar 2019, 15:42

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

My quote was definitely faulty. Speed trim comes...

My quote was definitely faulty. Speed trim comes from the flight control computer. See: https://www.pprune.org/showpost.php?p=10303984&postcount=37

Edit: Reading that detailed reference suggests...

Forum: Tech Log

25th Mar 2019, 17:55

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

Alchad Thanks for copying the original post....

Alchad

Thanks for copying the original post. I hope my comment helped track that down, and was not too creative an interpretation. It seems nobody is 100% sure? In any case the action for runaway...

Forum: Tech Log

25th Mar 2019, 16:14

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

Alchad I am quoting from memory, but the...

Alchad

I am quoting from memory, but the explanation somewhere on this forum is:
1. On the NG there are only two inputs for electrical trim, the autopilot flight control computers and the yokes....

Forum: Tech Log

21st Mar 2019, 13:23

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

Forgive my curiosity as a complete outsider. Do...

Forgive my curiosity as a complete outsider. Do pilots ever refer to the trim scale on the pedestal, other than before takeoff? Is is part of any scan, or checklist?

Forum: Tech Log

20th Mar 2019, 23:44

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

I have been told more than once that this kind of...

I have been told more than once that this kind of statement contains several misperceptions. I leave it to others to provide the correct answer.

Forum: Tech Log

19th Mar 2019, 15:52

Replies: 195

737MAX Stab Trim architecture

Views: 133,204

Posted By GordonR_Cape

That's not a solution at all. The B737 already...

That's not a solution at all. The B737 already has a stick shaker and stall warning. The problem is that the elevator does not have sufficient authority, and the stabiliser needs to be rapidly...

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