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Search: Posts Made By: PEI_3721
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Forum: Rumours & News
18th Dec 2019, 17:47
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

JT, #4634, Re fitting “a variable downspring...

JT, #4634,

Re fitting “a variable downspring in the circuit”, this appears to be the underlying theory of MCAS - electronic ‘down spring’. However the implementation differs between aircraft with...
Forum: Rumours & News
3rd Dec 2019, 22:01
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

… the aircraft design allows for it, but practice shows …

Yo gums, :ok:

“The investigation team agrees that the aircraft design allows for it. But, the air accidents investigation practice shows that it is not always able to promptly identify the...
Forum: Rumours & News
3rd Dec 2019, 21:29
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Yo gums, et al. The emerging views requiring...

Yo gums, et al.
The emerging views requiring more experience (and training) could relate to the pitch trim operation and ability to detect a trim runaway other than MCAS inhibit; which could also...
Forum: Rumours & News
20th Nov 2019, 16:44
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Dave, 586, for info BAe 146, Avro RJ, DH 125;...

Dave, 586,
for info BAe 146, Avro RJ, DH 125; every production aircraft was stalled clean and as configured for landing.
Risk was managed by fitting a stall panel for comparing cross side AoA vanes...
Forum: Rumours & News
14th Nov 2019, 18:09
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

sky9, presumably the values of trim rate /...

sky9, presumably the values of trim rate / tailplane increment, which Boeing implemented; these are what the aircraft required to meet the certification requirements.
Forum: Rumours & News
14th Nov 2019, 16:10
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

gums, et al, We wait for information about the...

gums, et al,
We wait for information about the modifications.

A likely scenario is a monitored dual system using the existing FCCs - two required for dispatch. If MCAS shuts down in flight, then...
Forum: Rumours & News
3rd Nov 2019, 14:10
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Gordon, reflecting on my previous thoughts;...

Gordon, reflecting on my previous thoughts; training as mitigation without system change would not now provide a satisfactory short term solution (for regulation).
Similarly, restrictive wt / cg,...
Forum: Rumours & News
31st Oct 2019, 13:03
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

A technical point which I may have missed: with...

A technical point which I may have missed: with the stick full back, MCAS remained active, but the main electric trim is disabled by the lower stick cutout switch. In this condition would any pilot...
Forum: Rumours & News
21st Oct 2019, 20:37
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Agree with gums; technical issues belong...

Agree with gums; technical issues belong elsewhere.
The 737 Max problem is not associated with FBW or stick configuration.
The 737 Max aerodynamic issue involves a stability deficiency (not...
Forum: Rumours & News
19th Oct 2019, 19:58
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Re Tomaski’s post #3192, and subsequent...

Re Tomaski’s post #3192, and subsequent discussions.
The points made are prefixed as ‘possible’, but subsequently argued as fact without supporting evidence.

Re MCAS design, from what has be been...
Forum: Rumours & News
24th Sep 2019, 16:16
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Fly Aiprt, :ok: we debate the same issues, but...

Fly Aiprt,
:ok: we debate the same issues, but from differing viewpoints.

Your disagreements about alerts, colour, etc, would have to be compared with existing certification requirements or...
Forum: Rumours & News
24th Sep 2019, 14:17
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Fly Aiprt, #2572, and comments / diagrams...

Fly Aiprt, #2572, and comments / diagrams thereafter, tomaski et al.

‘AoA Disagree’ was an option in those aircraft with ADCs which use AoA for internal corrections, e.g. 737 NG. Thus the AoA...
Forum: Rumours & News
22nd Sep 2019, 09:28
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Bend alot, #2489, There have been extensive and...

Bend alot, #2489,
There have been extensive and knowledgable discussions on a range of possibilities for AoA malfunction in the technical forum.
Without supportive evidence from the investigations,...
Forum: Rumours & News
22nd Sep 2019, 06:51
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Takwis, no disagreement with #2472, except that...

Takwis, no disagreement with #2472, except that the issues are identified with hindsight. For real learning we need to understand the processes which enabled them; look from the other end of the...
Forum: Rumours & News
21st Sep 2019, 16:05
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Takwis, #2469, IFF789, #2467, It is...

Takwis, #2469, IFF789, #2467,

It is difficult to understand how MCAS is wrong in principle. As a fix for a stability problem identified during flight test, the design (theory) was adequate...
Forum: Rumours & News
6th Sep 2019, 16:40
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

# 2225 The fourth item could also be...

# 2225
The fourth item could also be challenging;
It can be assumed that MCAS is now well protected from a single AoA failure, but the coincident effects on other systems - ADC, speed corrections,...
Forum: Rumours & News
17th Aug 2019, 06:36
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

An alternative view, maybe; or some home truths...

An alternative view, maybe; or some home truths which if left unsaid …

See full article (if able) via link below.

“… the situation of Boeing 737 MAX is less bright than expected. My previous...
Forum: Rumours & News
10th Jul 2019, 12:20
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

phylosocopter, #1295 Re “code or standards...

phylosocopter, #1295
Re “code or standards around the state of display and alarms in case of AP”
There are standards in CS 25 etc and ACs, however many are interpretive and do not cover grandfather...
Forum: Rumours & News
26th Jun 2019, 16:36
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

yoko1, # 676 The FDR printout suggests that...

yoko1, # 676

The FDR printout suggests that the electric trim was operable at that time, however there is no evidence that the tail moved - possibly too short a time scale. Thus probability enters...
Forum: Rumours & News
14th Jun 2019, 09:03
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

fdr # 398 Yes getting close, but two related...

fdr # 398
Yes getting close, but two related issues divide our views.

First, ‘… the technique to unload the trim to gain in trim condition again is able to be taught’ assumes that there will be...
Forum: Rumours & News
13th Jun 2019, 16:45
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

fdr, Clarifying my point, scepticism that the...

fdr,
Clarifying my point, scepticism that the Max can be flown safely, has nothing to do with MCAS.
If the trim, for whatever reason, exceeds a particular deviation then the likelihood of being...
Forum: Rumours & News
13th Jun 2019, 11:22
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

HighWind, # 371, :ok: A clear and balanced...

HighWind, # 371, :ok:
A clear and balanced summary; I agree, although the future might not be the simple either-or alternatives.

The Max might have the simplest route. If trim does not meet the...
Forum: Rumours & News
12th Jun 2019, 13:34
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

The gums # 346, You are correct in considering...

The gums # 346,
You are correct in considering a wider view of stability, not just aerodynamics; cg, thrust, the complete aircraft. In the purist sense stability is more precise, and certification...
Forum: Rumours & News
11th Jun 2019, 21:27
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Yo gums, # 342. Re Airbus certification,...

Yo gums, # 342.

Re Airbus certification, your ‘waivers and exceptions’ (#31)j. In practice these were alternative means of compliance for existing regulations, or proposals for new ‘equivalent...
Forum: Rumours & News
11th Jun 2019, 12:19
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

petit plateau, AoA. Perhaps a slip, but it’s...

petit plateau, AoA.
Perhaps a slip, but it’s the parameter ‘AoA’, opposed to an indicator which is important in MCAS.

The certification issue appears to involve stability margin, often simplified...
Forum: Rumours & News
8th Jun 2019, 18:25
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Yo gums, As discussed previously, an...

Yo gums,
As discussed previously, an aerodynamic correction (‘fix’) might not be particularly easy, if at all; and / or it could affect the economics aircraft operation. Aero fix might not sell so...
Forum: Rumours & News
1st Jun 2019, 17:52
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Yo, gums, Why not use ‘q’ I don’t know;...

Yo, gums,
Why not use ‘q’
I don’t know; superficially speed for trim would be a logical association.
However, as much as Boeing sticks to the stability line, the aircraft’s sensitivity at low...
Forum: Rumours & News
1st Jun 2019, 13:24
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Bend alot, What if the difference now focuses...

Bend alot,
What if the difference now focuses on trim runway.
The NG in-service, apparently without incident. The Max grounded following two accidents which suggests that the trim runaway drill...
Forum: Rumours & News
1st Jun 2019, 09:20
Replies: 4,656
Views: 4,780,350
Posted By PEI_3721

Delay

Bend alot, # 78

Boeing proposed a modification, 17 Apr. https://www.boeing.com/commercial/737max/737-max-software-updates.page
This was rejected by the FAA, no specific reasons given, thus Boeing...
Showing results 1 to 29 of 29


 
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