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Search: Posts Made By: CurtainTwitcher
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Forum: Rumours & News
8th Dec 2018, 01:28
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

We are in fierce agreement hans.

We are in fierce agreement hans.
Forum: Rumours & News
7th Dec 2018, 23:26
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

There is the problem right from the very first...

There is the problem right from the very first assumption, correct AoA data.

I don't think there is any disagreement about the need, intent and function of the MCAS. The issue appears to be this,...
Forum: Rumours & News
5th Dec 2018, 21:16
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

I have a copy of the QRH Runaway Stabilizer NNC...

I have a copy of the QRH Runaway Stabilizer NNC (my bold):


From the FDR traces, the failure mode does not appear at face value to meet the NNC condition statement. The adverse trim will stop for...
Forum: Rumours & News
1st Dec 2018, 20:53
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Someone earlier in thread mentioned CFR 25.672...

Someone earlier in thread mentioned CFR 25.672 Stability augmentation and automatic and power-operated systems (https://www.law.cornell.edu/cfr/text/14/25.672). I think it is worth quoting verbatim,...
Forum: Rumours & News
1st Dec 2018, 02:26
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

The trim wheel sound would have been inaudible...

The trim wheel sound would have been inaudible with the stick shaker continuously sounding. Not easy to think or communicate with that continuously sounding. Any attempt to communicate subtleties...
Forum: Rumours & News
30th Nov 2018, 23:43
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Two very recent accidents attributable to poor...

Two very recent accidents attributable to poor solder joints as the initial mechanical cause, leading to subsequent mishandling by the crew. TransAsia Airways Flight 235...
Forum: Rumours & News
21st Nov 2018, 23:27
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Will all due respect some posters who are not in...

Will all due respect some posters who are not in the industry, this is a technical discussion for knowledgable individuals who operate at a level substantially beyond layman "conjecture", just...
Forum: Rumours & News
17th Nov 2018, 22:44
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Good insights MickG0105, good addition to the...

Good insights MickG0105, good addition to the knowledge base.

My understanding is that manual electric trim overrides the Speed Trim System (STS) for 5 seconds, ie if a manual electric trim input...
Forum: Rumours & News
14th Nov 2018, 04:53
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Complete the Runaway Stabiliser NNC checklist...

Complete the Runaway Stabiliser NNC checklist memory items prior to the flaps being retracted. I just so happens that the first 2 items of the runaway checklist ALREADY covered by the Airspeed...
Forum: Rumours & News
13th Nov 2018, 22:52
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

original #978...

original #978 (https://www.pprune.org/10307740-post978.html) (permalink (https://www.pprune.org/rumours-news/614857-indonesian-aircraft-missing-off-jakarta-post10307740.html))

Just to clarify &...
Forum: Rumours & News
13th Nov 2018, 22:24
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Good pickup lurkingpax, nice crowdsourcing info. ...

Good pickup lurkingpax, nice crowdsourcing info.
For those interested in following the document trail that lurkingpax has added to, the original document is here:
OPERATIONAL EVALUATION REPORT THE...
Forum: Rumours & News
12th Nov 2018, 22:11
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Thank you infrequentflyer789, it's a great day...

Thank you infrequentflyer789, it's a great day when I can learn a new trick from somebody, particularly enhancing knowledge of advanced google search syntax. A cheat sheet covering all the search...
Forum: Rumours & News
12th Nov 2018, 19:40
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

If you do a google search for "Maneuvering...

If you do a google search for "Maneuvering Characteristics Augmentation System" (must be in quotes to search fro the exact phrase, or MCAS, but limit the search to prior to 01 Nov 2018 there are no...
Forum: Rumours & News
12th Nov 2018, 06:11
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Earlier in the thread it was mentioned that with...

Earlier in the thread it was mentioned that with an a very nose trim as speed increased it may become impossible to overcome the (large) trim with (small) elevator, even with both pilots using full...
Forum: Rumours & News
12th Nov 2018, 01:14
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Not necessarily, it is entirely conceivable that...

Not necessarily, it is entirely conceivable that a design flaw has been lurking there since day one of commercial operation. It just takes a specific sequence to cause an accident. I mentioned...
Forum: Rumours & News
11th Nov 2018, 20:23
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

That is exactly the point, the recognition of the...

That is exactly the point, the recognition of the actual problem is very subtle due to the intermit nature of the MCAS being disabled for 5 seconds after manual trim. The first step in the UA...
Forum: Rumours & News
11th Nov 2018, 19:24
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Unfortunately this MCAS intervention is not a...

Unfortunately this MCAS intervention is not a classic "runaway stabiliser", it stops for 5 seconds after trim application, then activates again. You could see how a crew dealing with an unreliable...
Forum: Rumours & News
11th Nov 2018, 05:14
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

One line of thinking is that the crew did end up...

One line of thinking is that the crew did end up using the cutout switches at some point, however, by this point it had been trimmed nose down (due AoA fault operating the MCAS). Now the electric...
Forum: Rumours & News
10th Nov 2018, 07:21
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

And who will program the machines? The problem...

And who will program the machines? The problem will be shifted from the flight deck to the software development cubical. Humans are deeply flawed decision makers, machines cannot construct...
Forum: Rumours & News
10th Nov 2018, 00:41
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

The corollary is also true, as it appears to be...

The corollary is also true, as it appears to be specific to the MAX -8 & -9 (due to STS system design changes), it is therefore not a black swan. There appear to only be around 220 MAX units in...
Forum: Rumours & News
9th Nov 2018, 07:47
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

So a plausible scenario for the crew faced based...

So a plausible scenario for the crew faced based on the Boeing Bulletin is:

At or soon after rotate, so message like "IAS disagree", possibly other messages and warnings, possibly even stick...
Forum: Rumours & News
8th Nov 2018, 07:54
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Interesting and highly plausible scenario...

Interesting and highly plausible scenario ExSp33db1rd.
Just to be clear, your thinking would be that the trim had run all the way forward, the crew were holding full backstick, THEN realised they...
Forum: Rumours & News
2nd Nov 2018, 02:34
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

Good points Rananim. The one issue I see here is...

Good points Rananim. The one issue I see here is with your more complex airspeed unreliable scenario with STS trim involvement is that you need to recognise that there is a linkage between the two,...
Forum: Rumours & News
29th Oct 2018, 07:13
Replies: 2,099
Views: 1,471,785
Posted By CurtainTwitcher

"Final Report No. KNKT.13.04.09.04, PT.Lion...

"Final Report No. KNKT.13.04.09.04, PT.Lion Mentari Airlines (Lion Air) Boeing 737 - 800;PK-LKS Ngurh Rai International Airport, Bali Republic of Indonesia 13 April 2013"...
Showing results 1 to 24 of 24


 
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