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24th Mar 2019, 18:53
Replies: 370
Views: 373,436
Posted By Ian W

I think that is precisely where we are at the...

I think that is precisely where we are at the moment.
I also think that operators increasingly skimping on training both initial and recurrent and searching FOQA and similar to ensure that nobody...
24th Mar 2019, 17:38
Replies: 370
Views: 373,436
Posted By Ian W

Systems in all modern aircraft will eventually...

Systems in all modern aircraft will eventually hand the bag of bolts to the pilot if they cannot make sense of what is happening or there is some occurrence they have not been programmed to respond...
23rd Mar 2019, 16:47
Replies: 370
Views: 373,436
Posted By Ian W

If you take the flying aircraft as a system,...

If you take the flying aircraft as a system, there was not a single point of failure. Apart from AoA there was the flight crew that were expected to understand and cope with a Stab Trim that was...
22nd Mar 2019, 14:14
Replies: 2,491
Views: 6,284,766
Posted By Ian W

It would appear that consideration was given to...

It would appear that consideration was given to this area and that the people involved believed that a qualified 737 pilot would disconnect Stab Trim if it was persistently trimming the aircraft in...
22nd Mar 2019, 13:48
Replies: 2,491
Views: 6,284,766
Posted By Ian W

The FOC/Command Center/Network Manager would deal...

The FOC/Command Center/Network Manager would deal with that in the same way it currently does. If the UA was flying completely autonomously, then that kind of major weather system would be one of...
22nd Mar 2019, 12:11
Replies: 2,491
Views: 6,284,766
Posted By Ian W

I worked in fault-tolerant computing for some...

I worked in fault-tolerant computing for some time and any single point of failure was something to be avoided at all costs. However, along come the mathematicians who say what is (a) the...
22nd Mar 2019, 11:05
Replies: 2,491
Views: 6,284,766
Posted By Ian W

Actually, the rich may not fly commercial but...

Actually, the rich may not fly commercial but they fly the same aircraft both A and B sell versions of their airliners that have been fitted out as business jets. See Boeing Business Jets...
21st Mar 2019, 18:31
Replies: 2,491
Views: 6,284,766
Posted By Ian W

So to sum up. In the same situation with a Stab...

So to sum up. In the same situation with a Stab Trim repeatedly trimming nose down, you would NOT switch off the Stab Trim at the cut out switches because the NNC says 'continuous' and this is...
21st Mar 2019, 14:58
Replies: 2,491
Views: 6,284,766
Posted By Ian W

It is precisely the same human factors problem. ...

It is precisely the same human factors problem. Overload a flight crew with a lot of warnings a real cognitive overload, and go from understimulated to overstimulated in a second a startle effect,...
21st Mar 2019, 13:24
Replies: 2,491
Views: 6,284,766
Posted By Ian W

While I understand the concern 'all' MCAS does is...

While I understand the concern 'all' MCAS does is trim down - yes successively and yes intermittently. But the net effect is that the aircraft automatics for some reason are giving me aggressive...
21st Mar 2019, 10:24
Replies: 2,491
Views: 6,284,766
Posted By Ian W

What is described is actually classic 'Automation...

What is described is actually classic 'Automation Surprise' (What's it doing now?) that is followed by attentional (cognitive) tunneling as the human's mind grasps at straws to try to understand...
20th Mar 2019, 16:58
Replies: 2,491
Views: 6,284,766
Posted By Ian W

Automation Surprise - or 'What's it doing now?'

Everything points to 'automation surprise' which occurs when automation does something you do not expect.
See "Automation Surprise" in Aviation: Real-Time Solutions...
20th Mar 2019, 15:52
Replies: 370
Views: 373,436
Posted By Ian W

infrequentflyer789...

infrequentflyer789 (https://www.pprune.org/members/214043-infrequentflyer789)

It is a whole different game coding in a safety related environment. I have worked in maintenance areas where "just...
20th Mar 2019, 12:07
Replies: 46
Views: 23,352
Posted By Ian W

My understanding is not that the Max is unstable...

My understanding is not that the Max is unstable without MCAS but that the pull force on the control column is not linear close to stall AoA. This is why MCAS does not operate with AP engaged. So a...
20th Mar 2019, 10:52
Replies: 2,491
Views: 6,284,766
Posted By Ian W

Or to put it another way: A flight engineer is...

Or to put it another way: A flight engineer is needed to watch the trim wheels and if necessary switch off Stab Trim, as pilots do not switch off the Stab Trim even after repeated uncommanded nose...
20th Mar 2019, 09:33
Replies: 2,491
Views: 6,284,766
Posted By Ian W

From post #2141 that does not appear to be the...

From post #2141 that does not appear to be the case as the jump seat rider on the previous flight knew and apparently told the crew how to fix it having gone back into the cabin and retrieved a...
19th Mar 2019, 18:40
Replies: 2,491
Views: 6,284,766
Posted By Ian W

That is just the point. I would have expected a...

That is just the point.
I would have expected a large number of 737 pilots to start quoting what happened when they get an AoA mismatch and unreliable airspeed. There is no large number - despite...
19th Mar 2019, 16:38
Replies: 2,491
Views: 6,284,766
Posted By Ian W

The reliable indication is that it is always...

The reliable indication is that it is always nose down trim and unless you do something about it and the AoA is still indicating a close to stall value it will wind in another nose down trim....
19th Mar 2019, 15:21
Replies: 2,491
Views: 6,284,766
Posted By Ian W

That is what I was talking about. From a very...

That is what I was talking about.
From a very low 'improbable' level of failure there is suddenly a significant failure rate. Something has changed between the NG and the Max, and that something...
19th Mar 2019, 14:29
Replies: 2,491
Views: 6,284,766
Posted By Ian W

Well true. But it is obviously not happening in...

Well true.
But it is obviously not happening in the worldwide fleet of NG and other 737 or failures would be too common to even think of using a single source of data.
So what in the chain of...
19th Mar 2019, 11:11
Replies: 2,491
Views: 6,284,766
Posted By Ian W

A question not asked on this thread yet..

For a safety system it makes no sense to have a 'single point of failure' this is a sine qua non of any safety related engineering. MCAS is obviously a safety system and (despite disparaging comments...
18th Mar 2019, 18:57
Replies: 2,491
Views: 6,284,766
Posted By Ian W

As FCEng says in post #1946 you cannot overcome...

As FCEng says in post #1946 you cannot overcome the StabTrim with elevator at high speed.
18th Mar 2019, 15:14
Replies: 75
Views: 65,869
Posted By Ian W

There is a certain je ne sais quoi knowing that...

There is a certain je ne sais quoi knowing that you guys are exercising code I wrote and systems I helped design :)
But don't expect huge sums or any thanks.
18th Mar 2019, 15:03
Replies: 2,491
Views: 6,284,766
Posted By Ian W

In fact the forward and higher placement of the...

In fact the forward and higher placement of the engines that required MCAS because of their aerodynamic lift at high AoA, has also significantly reduced the pitch/power couple as the engines are...
18th Mar 2019, 13:48
Replies: 2,491
Views: 6,284,766
Posted By Ian W

But more speed when your stab trim is too nose...

But more speed when your stab trim is too nose down is your enemy. Reduction in speed would reduce the force to counter the nose down trim so 'piloting' would dictate reducing speed.
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