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Search: Posts Made By: Peter H
Showing results 1 to 35 of 51
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Forum: Rumours & News
13th Dec 2019, 10:08
Replies: 4,656
Views: 4,791,273
Posted By Peter H

80 pounds of pull represents a strongly expressed...

80 pounds of pull represents a strongly expressed opinion by the pilot, and it seems unhelpful that a "feel-augmentation" system can override it.

Adding another column switch that (temporarily)...
Forum: Rumours & News
6th Dec 2019, 23:05
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Perhaps appropriate to mention that one of the...

Perhaps appropriate to mention that one of the problems with the Challenger shuttle was that the booster sections were
often distorted, and the "official" way to "make good" didn't always work. If...
Forum: Rumours & News
5th Dec 2019, 13:21
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Interesting choice of words in:...

Interesting choice of words in: https://www.barrons.com/articles/boeing-is-trading-like-a-pharma-stock-and-the-737-max-is-its-drug-waiting-for-approval-51575499155

Boeing, when asked, reiterated...
Forum: Rumours & News
27th Nov 2019, 17:21
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I'm still having a lot of trouble getting my head...

I'm still having a lot of trouble getting my head around B's thought processes.
1. Don't tell the pilots about the existence of MCAS
2. Expect the pilot to respond within seconds to an...
Forum: Rumours & News
24th Nov 2019, 16:56
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I wondered this when Icelandair were doing...

I wondered this when Icelandair were doing flaps-1 ferries, and found this:

In https://leehamnews.com/2019/09/27/bj...-wire-part-10/...
Forum: Rumours & News
24th Nov 2019, 00:18
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I think the point is that the rate-of-change of...

I think the point is that the rate-of-change of stick force has to be acceptable, as well as its absolute value.
Forum: Rumours & News
23rd Nov 2019, 13:32
Replies: 4,656
Views: 4,791,273
Posted By Peter H

PeterH: What a pity that a little of the MAX...

PeterH: What a pity that a little of the MAX down-time wasn't spent testing/demonstrating the truth of that position. (Acceptable bare airframe aerodynamics.)
OldnGrounded: Do we know that hasn't...
Forum: Rumours & News
23rd Nov 2019, 10:21
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Removing MCAS from the 737 Max is "how to get...

Removing MCAS from the 737 Max is "how to get some confidence back to us all that we as Authorities can sleep at night when that day comes when the MAX returns to service."...
Forum: Rumours & News
18th Nov 2019, 14:32
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I hope that they are making false activation of...

I hope that they are making false activation of MCAS survivable, and also trying to minimise the frequency of false activations. Although
keeping the hardware unchanged means that the engineers are...
Forum: Rumours & News
15th Nov 2019, 21:17
Replies: 4,656
Views: 4,791,273
Posted By Peter H

>"The FAA's return-to-service decision for the...

>"The FAA's return-to-service decision for the MAX will rest solely on the FAA's assessment of whether Boeing's proposed software updates and pilot training address the know issues for the grounding...
Forum: Rumours & News
10th Nov 2019, 20:47
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I read that as reporting that the MAX's...

I read that as reporting that the MAX's "suboptimal" aerodynamics (which MCAS is designed to tame) only has a "minor"
safety impact within the normal envelope. (Pedantically - for at least one point...
Forum: Rumours & News
1st Nov 2019, 12:34
Replies: 4,656
Views: 4,791,273
Posted By Peter H

In Satcom Guru: Flawed Assumptions Pave a Path to...

In Satcom Guru: Flawed Assumptions Pave a Path to Disaster
https://www.satcom.guru/2019/10/flawed-assumptions-pave-path-to-disaster.html
Peter Lemme says:
In Stall identification (augmentation) is...
Forum: Rumours & News
31st Oct 2019, 18:56
Replies: 4,656
Views: 4,791,273
Posted By Peter H

I think that may have first appeared as post #737...

I think that may have first appeared as post #737
https://www.pprune.org/showthread.php?p=10504031

Other, but not all, wiring diagrams on #750, #780 & #947
Forum: Rumours & News
25th Oct 2019, 23:46
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Do you have more details on that? The original...

Do you have more details on that? The original Bloomberg article said pilot, and I've missed any correction.

Original Bloomberg...
Forum: Rumours & News
21st Oct 2019, 20:09
Replies: 4,656
Views: 4,791,273
Posted By Peter H

An earlier post by infrequentflyer789 addressed...

An earlier post by infrequentflyer789 addressed this question (my emphasis). Is anybody in a position to comment?

https://www.pprune.org/10516725-post1325.html (My emphasis)

All (civilian) fbw...
Forum: Rumours & News
18th Oct 2019, 20:28
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Hang on, does this mean that intentional MCAS...

Hang on, does this mean that intentional MCAS operation was unacceptably severe?

So far I'd assumed that (low speed, low altitude) unintentional MCAS activation was so dangerous
because the...
Forum: Rumours & News
24th Sep 2019, 14:17
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Nice thoughtful post. Not only is there no...

Nice thoughtful post.

Not only is there no prohibition against multiple or ambiguous malfunctions, but in some case
their occurrence is by-design (intentional or not). Naively as SLF I assumed...
Forum: Rumours & News
22nd Sep 2019, 18:16
Replies: 4,656
Views: 4,791,273
Posted By Peter H

>FlyAiprt >Infrequentflyer, great post ! ...

>FlyAiprt
>Infrequentflyer, great post !
>Indeed what you mention here has been nagging at me for a while.
>The MCAS principle doesn't make sense : can't be overridden with the yoke because they...
Forum: Rumours & News
21st Sep 2019, 07:39
Replies: 4,656
Views: 4,791,273
Posted By Peter H

Are you describing the flight where: - the...

Are you describing the flight where:
- the 2-man crew failed to handle the problem
- and the day was only saved by a 3rd dead-heading pilot on the flight deck
... as "was handled fine"?[/left]
Forum: Rumours & News
18th Sep 2019, 23:22
Replies: 4,656
Views: 4,791,273
Posted By Peter H

According to...

According to https://www.pprune.org/showthread.php?p=10573017
... somebody is already doing so, by "utilizing the 737 Max during planned maintenance movements".

Not just sim sessions in Canada......
Forum: Rumours & News
12th Sep 2019, 13:11
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
10th Sep 2019, 23:30
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
7th Sep 2019, 10:04
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
6th Sep 2019, 09:30
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
5th Sep 2019, 19:40
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
5th Sep 2019, 11:33
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
4th Sep 2019, 21:18
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
3rd Sep 2019, 23:14
Replies: 4,656
Views: 4,791,273
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'.
Forum: Rumours & News
21st Aug 2019, 13:33
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
18th Aug 2019, 12:26
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
6th Aug 2019, 11:29
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
2nd Aug 2019, 12:27
Replies: 4,656
Views: 4,791,273
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
Forum: Rumours & News
25th Jul 2019, 09:44
Replies: 4,656
Views: 4,791,273
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...
Forum: Rumours & News
23rd Jul 2019, 11:11
Replies: 4,656
Views: 4,791,273
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?
Forum: Rumours & News
22nd Jul 2019, 21:16
Replies: 4,656
Views: 4,791,273
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"...
Showing results 1 to 35 of 51
 
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