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12th Sep 2019, 13:11
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Somebody brought up a query from post #3. This...

Somebody brought up a query from post #3. This topic was explored in a Tech Log thread. https://www.pprune.org/tech-log/621887-ths-hinge-point.html?highlight=Stabiliser#post10479100

I gained the...
10th Sep 2019, 23:30
Replies: 2,410
Views: 2,149,946
Posted By Peter H

>Disengage autopilot and control airplane pitch...

>Disengage autopilot and control airplane pitch attitude with control column and main electric trim as required.
>If relaxing the column causes the trim to move, set stabilizer trim switches to...
7th Sep 2019, 10:04
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Which raises another question, how accurately can...

Which raises another question, how accurately can a failure in an AoA system be detected "at or before takeoff"?
I seem to remember reading that features like the AoA-differ warning [which B forgot...
6th Sep 2019, 09:30
Replies: 2,410
Views: 2,149,946
Posted By Peter H

This looks like the intend link...

This looks like the intend link https://www.bbc.co.uk/news/business-49591363
Mr Ky's presentation showed a refusal to accept delegation was the first of the four conditions that had to be met before...
5th Sep 2019, 19:40
Replies: 2,410
Views: 2,149,946
Posted By Peter H

My emphasis. It's different because: -...

My emphasis.

It's different because:
- MCAS trimming is disabled by an additional force-operated switch which "is automatically hardware-toggled by emergency-level pulling on the stick".
- while...
5th Sep 2019, 11:33
Replies: 2,410
Views: 2,149,946
Posted By Peter H

An idea which seems to offer an easy path to two...

An idea which seems to offer an easy path to two incremental improvements.

1) If you keep the operation of this switch to the fixed wiring (i.e. computer-out-of-loop) the need for low-latency...
4th Sep 2019, 21:18
Replies: 2,410
Views: 2,149,946
Posted By Peter H

I think when MurphyWasRight said "It is useful...

I think when MurphyWasRight said
"It is useful to keep in mind that as far as we know the MCAS software worked exactly as specified/designed/implemented"
he was meaning:
- the MCAS software...
3rd Sep 2019, 23:14
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Don't know if I'm especially unlucky, but the...

Don't know if I'm especially unlucky, but the link wouldn't load until I removed the 's' from 'https'. It then loaded and re-establish the 's'.
21st Aug 2019, 13:33
Replies: 2,410
Views: 2,149,946
Posted By Peter H

The same unrepentant management. It really...

The same unrepentant management.

It really must be having a chilling effect on relationships with other authorities that both Boeing and the FAA don't
seem to recognise that they have erred in...
18th Aug 2019, 12:26
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Me neither. But it does seem indefensible that...

Me neither. But it does seem indefensible that the safety analysis of the inappropriately activation of a function (MCAS) should be able to ignore the presence of the
failure that triggered the...
6th Aug 2019, 11:29
Replies: 2,410
Views: 2,149,946
Posted By Peter H

As SLF and retired s/w engineer I find the...

As SLF and retired s/w engineer I find the discussion of high-reliability computer systems interesting, but feel that in this case it is misplaced.
MCAS's use of trim to provide feel may have...
2nd Aug 2019, 12:27
Replies: 2,410
Views: 2,149,946
Posted By Peter H

An interesting observation on the decision...

An interesting observation on the decision process:
The Challenger: An Information Disaster https://www.asktog.com/books/challengerExerpt.html
25th Jul 2019, 09:44
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Equally, in a DAL-C implementation inappropriate...

Equally, in a DAL-C implementation inappropriate MCAS triggering only became a show-stopper because of "modifying systems that were never intended for this kind of application".

Only SLF, but...
23rd Jul 2019, 11:11
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Any chance that this is the cause of both the...

Any chance that this is the cause of both the cpu-overload and autopilot-fails-to-disengage issues?
22nd Jul 2019, 21:16
Replies: 2,410
Views: 2,149,946
Posted By Peter H

:ok: An excellent start to addressing this "we...

:ok: An excellent start to addressing this "we will polish the raw data to improve your piloting experience" ... "oh dear we cannot fully polish, panic mode, warnings on, autopilot off, over to you"...
21st Jul 2019, 16:43
Replies: 12
Views: 9,381
Posted By Peter H

Live updates as 'light aircraft crashes in field'...

Live updates as 'light aircraft crashes in field' near Folkestone
https://www.kentlive.news/news/kent-news/live-updates-light-aircraft-crashes-3118124
20th Jul 2019, 22:36
Replies: 63
Views: 41,501
Posted By Peter H

According to the BBC coverage...

According to the BBC coverage https://www.bbc.co.uk/news/uk-49059700A BA spokesman said: "We constantly review our security arrangements at all our airports around the world,and have suspended...
19th Jul 2019, 00:57
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Over in another thread ... These two...

Over in another thread ...


These two paragraphs seem to indicate why AF is being prosecuted, and why SNPL thinks Airbus should also be.

While this indictment concludes that AIR FRANCE has...
18th Jul 2019, 10:02
Replies: 73
Views: 65,550
Posted By Peter H

I quoted somebodies timeline on this in...

I quoted somebodies timeline on this in https://www.pprune.org/rumours-news/623116-a380-engine-piece-found-groenland-after-9-months-3.html#post10512149
14th Jul 2019, 09:35
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Perhaps part of the problem is the absence of a...

Perhaps part of the problem is the absence of a crisp - but mildly pejorative - term for the unwanted behaviour. Maybe "oversteer in pitch" captures some of the semantics, while still being somewhat...
Forum: Tech Log
10th Jul 2019, 14:46
Replies: 11
Views: 2,202
Posted By Peter H

From video and stills showing unusual...

From video and stills showing unusual combinations of AoA and attitude.
https://www.pprune.org/tech-log/616969-aoa-versus-pitch.html#post10353314

Pitch +5 AoA -15 (estimating AoA from smoke...
10th Jul 2019, 11:50
Replies: 2,410
Views: 2,149,946
Posted By Peter H

From...

From https://www.bloomberg.com/news/articles/2019-07-05/europe-sets-out-demands-for-boeing-before-max-can-fly-again with my numbers
EASA’s checklist includes a number of issues that have been...
10th Jul 2019, 09:52
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Also, when possible, it might be appropriate for...

Also, when possible, it might be appropriate for HAL to [very infrequently] warn the pilots of the context of an impending disconnect.

As an example I always felt that there was a real possibility...
8th Jul 2019, 15:31
Replies: 2,410
Views: 2,149,946
Posted By Peter H

Does this indicate that the MAX maintenance...

Does this indicate that the MAX maintenance procedures failed to detect that this "standard" feature wasn't working?
7th Jul 2019, 20:10
Replies: 2,410
Views: 2,149,946
Posted By Peter H

From the already discussed Bloomberg article...

From the already discussed Bloomberg article https://www.bloomberg.com/news/articles/2019-07-05/europe-sets-out-demands-for-boeing-before-max-can-fly-again
EASA’s checklist includes a number of...
Showing results 1 to 25 of 124
 


 
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