Search found 759 matches

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by phollingsworth
Wed Mar 11, 2020 3:00 pm
Forum: Civil Aviation
Topic: Flybe News and Discussion Thread Update: Flybe ceases flying, enters administration
Replies: 858
Views: 132666

Re: Flybe News and Discussion Thread Update: Flybe ceases flying, enters administration

Aircraft will be held until fees paid. When .£££. Coughed up... Dash8 released. Q.E.D. Yup the Civil Aviation Act allows airports to seize aircraft without first having to go to court for non-payment. In normal UK contract law this would not be allowed unless the asset was used to secure the debt. ...

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by phollingsworth
Fri Jan 24, 2020 4:11 pm
Forum: Civil Aviation
Topic: Boeing NMA in doubt as customers push for all new 737MAX and 757 replacement
Replies: 1049
Views: 155435

Re: Boeing NMA in doubt as customers push for all new 737MAX and 757 replacement

Let's be blunt. Boeing does not have the engineering resources to launch and NMA (or NSA for that matter) in the immediate term. The 737MAX and 777X programmes are consuming everything on the commercial side and more. Also, even if they did they have already lost the 757-200 replacement market to A...

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by phollingsworth
Fri Jan 24, 2020 9:49 am
Forum: Civil Aviation
Topic: Boeing NMA in doubt as customers push for all new 737MAX and 757 replacement
Replies: 1049
Views: 155435

Re: Boeing NMA in doubt as customers push for all new 737MAX and 757 replacement

Let's be blunt. Boeing does not have the engineering resources to launch and NMA (or NSA for that matter) in the immediate term. The 737MAX and 777X programmes are consuming everything on the commercial side and more. Also, even if they did they have already lost the 757-200 replacement market to Ai...

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by phollingsworth
Fri Jan 24, 2020 9:18 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding News and Reference Thread 2020

A different article based on the Calhoun interview. Seattle Times Calhoun announced that the development work Boeing has been doing for several years on a new airplane—internally known as the New Midmarket Airplane (NMA)—is starting over. “We’re not giving up on the future,” he said. “But for me, m...

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by phollingsworth
Wed Jan 22, 2020 4:12 pm
Forum: Civil Aviation
Topic: grandfathering and the boeing 737 Max
Replies: 20
Views: 2595

Re: grandfathering and the boeing 737 Max

I am going to ask an honest question. Who here has read the certification basis for the 737MAX and/or the A320 NEO? I have seen lots of comments on things being grandfathered on the MAX where those systems are clearly not. In many cases where the MAX, or NEO for that matter, is certified to an older...

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by phollingsworth
Wed Jan 22, 2020 3:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Yes I answered that. They are putting the needs of outside agencies ahead of US airlines, employees, and consumers. It's none of their business what the EASA does with the Max. Even if it were never to fly in the EU again, it's still not their concern. That's between Boeing and the EASA to figure o...

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by phollingsworth
Wed Jan 22, 2020 11:34 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Why would Boeing design MCAS for a 10 second cycle duration, when you expect them to shut it down after three seconds (because that in Boeings mind would constitute to a trim runaway). Let alone design it for multiple 10 second cycles (MCAS 1.0 that is). By designing in the 10 second MCAS cycle, Bo...

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by phollingsworth
Tue Jan 21, 2020 4:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

With almost $20B, why didn't Boeing kill this ugly frankenplane back in June, when they knew that this mess will cost a lot? Because they have billions of dollars invested in all the MAXes they've already built, not to mention all the investments they and their partners have made, nor all the commi...

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by phollingsworth
Tue Jan 21, 2020 4:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

MCAS, when operating properly, does not "force the plane to dive." In introduces a mis-trim to cause it to take more force to lift the nose more. MCAS, operating properly, would never have caused a plane to dive or even for a pilot to notice it existed. The issue with MCAS was the botched...

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by phollingsworth
Tue Jan 21, 2020 2:48 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

In a situation where the AOA instrument is malfunctioning and MCAS is turned off, would normal manual operation of the aircraft produce an angle-of-attack that could lead to a stall? If yes then the problem is the structural design of the aircraft. It's an ongoing debate if it really could lead to ...

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by phollingsworth
Tue Jan 21, 2020 1:46 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Agreed, max specific training would probably go along way to helping bring it more in line with the safety record of other aircraft. Fred Sent from my iPhone using Tapatalk Unfortunately, it is taking the FAA, EASA and the JTAR participants forever and a day to come up with what they want that trai...

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by phollingsworth
Mon Jan 20, 2020 4:32 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Boeing is currently paying the price for trying to retrofit safety criticality into an avionics suite that is not design to be safety critical. It is something that can be done, but basically requires rewriting the entire software stack to accomplish. Had Boeing gone for a rebuild of the underlying...

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by phollingsworth
Mon Jan 20, 2020 2:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Total cost for the grounding is now estimated more than 20 billions: https://aviationweek.com/air-transport/aerospace-analysts-see-growing-737-max-costs-boeing?utm_rid=CPEN1000014909485&utm_campaign=22889&utm_medium=email&elq2=46e264cf54a449d99b58b0f6dab1f440 And this 20 billion figure ...

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by phollingsworth
Mon Jan 20, 2020 11:25 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The 737-8/9 MAX is in fact close to a FBW stab trim, but without the safety of a FBW system, and this is the origin of the problem. In AP flight mode, the 737-8/9 MAX already operate the elevators and stab trim from as in a FBW aircraft. In manual flight mode, the aerodynamic of the 737-8/9 MAX req...

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by phollingsworth
Mon Jan 20, 2020 11:11 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Would it be possible for Boeing to do a MAX 2.0, where they use the same components as now such as fuselage, landing gear, engines, etc, but add the 787 avionics/FBW? It would be a huge amount of work, but still probably less than a clean sheet design. If they do that only for the FAA to decide it’...

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by phollingsworth
Mon Jan 20, 2020 10:57 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Would it be possible for Boeing to do a MAX 2.0, where they use the same components as now such as fuselage, landing gear, engines, etc, but add the 787 avionics/FBW? I don’t think they need a full FBW system, but just a FBW trim (stabilizer) and maybe elevator. CRJ-1000 got a FBW rudder - and it w...

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by phollingsworth
Fri Jan 17, 2020 4:58 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Incidentally, the above issue shows up sooner for the 737 than it would for a 757, 757, or A320 with the same basic static margin. This is because of the nature of the control system. The controls on the other aircraft are fully hydraulically driven and irreversible, so they can be approximated as ...

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by phollingsworth
Fri Jan 17, 2020 11:26 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

It will be somewhat discredited because "Leeham's always negative about Boeing", but to be honest, most of what he's saying is just common sense. Some posters here are overly optimistic on how long they think it will take Boeing to ramp production back up and get to the 57 they were aimin...

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by phollingsworth
Fri Jan 17, 2020 11:21 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I heard that at slow speeds and higher AoA the engine and wing leading edge work like slotted flaps. True, but wing leading edge didn't change from NG and engine is not all that much bigger than NG's engine, no? It's not quite true, but a reasonable first order approximation. The 737 wing has Kruge...

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by phollingsworth
Thu Jan 16, 2020 4:39 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The high and low speed problems are actually slightly different. The high-speed problem is a control force gradient per g in a manoeuvre. In actuality this will exist at all speeds, unless the wing-body-nacelle interactions change drastically with speed. The reason for this is the control force gra...

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by phollingsworth
Thu Jan 16, 2020 1:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Unfortunately, Boeing tinkered with a perfectly stable, satisfactory STS, and retrospectively added MCAS-related functionality. If we believe all the reports that have been released, they added MCAS before flight test because it was needed, whether aero or rules is another question, but it was also...

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by phollingsworth
Thu Jan 16, 2020 9:22 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Thanks for your excellent and well layed out posts. It's really enjoyable to read them amongst some of the garbage being trown around here. Just want to add that apart from the low STS failure rate, another consideration is that for most STS failure modes control column inputs override/stops STS (u...

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by phollingsworth
Thu Jan 16, 2020 9:13 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

. . . Because of the history of the 737 the STS uses only one Pitot-Static system at a time (I believe there are two computers that can be switched between). Therefore if the pitot-static system fails to a low speed the system will runaway nose down. Boeing use the now infamous 'bad maths' to show ...

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by phollingsworth
Thu Jan 16, 2020 8:59 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The original Speed/Mach trim function was created to account for the shift in neutral point as the Mach number increases and decreases, e.g. avoid Mach Tuck (which can kill you). However, over the years is have been expanded to provide a number of additional functions, primarily around speed stabil...

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by phollingsworth
Wed Jan 15, 2020 3:04 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Obviously, there isn't the whole chain of the decision making authority. However, the extension and increase rates at 1g would jive with increase stall identification. If you want the aircraft to pitch down rapidly in the pre, at, and post-stall regime you would need much faster stab movement than ...

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by phollingsworth
Wed Jan 15, 2020 2:28 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

... I will admit that what still is missing and related to MCAS is the adjustments made to the authority during the test phase, and even that is not discussed much these days, has the reasons for that been accepted? If the EASA test flights start today or later this month, maybe we will finally get...

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by phollingsworth
Wed Jan 15, 2020 12:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

According to this guy at Leeham restarting production and getting up to speed again will take years: https://leehamnews.com/2020/01/15/boeing-hasnt-hit-bottom-yet-neither-have-suppliers/ The MAX fiasco puts Boeing so much behind Airbus in the narrowbody race, I wonder if Boeing will ever catch up? ...

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by phollingsworth
Wed Jan 15, 2020 12:02 pm
Forum: Civil Aviation
Topic: Flybe News and Discussion Thread Update: Flybe ceases flying, enters administration
Replies: 858
Views: 132666

Re: Flybe News and Discussion Thread

APD is paid for each transported passenger. Does HMRC collect it prior to or post the actual transportation? Most tax authorities collect tax on a periodic basis, e.g quarterly. However, some do it before the charge is actually accrued, others after, and others a mix. If Flybe isn't getting their m...

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by phollingsworth
Wed Jan 15, 2020 11:49 am
Forum: Civil Aviation
Topic: Flybe News and Discussion Thread Update: Flybe ceases flying, enters administration
Replies: 858
Views: 132666

Re: Flybe News and Discussion Thread

Why aren’t Virgin Atlantic and the various consortiums picking up the bill? Surely they knew the financial state of Flybe before the takeover? They 'knew' what they were getting into at the time. However, that does not mean that today corresponds well to the prediction in Jan 2019 of where Flybe wo...

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by phollingsworth
Wed Jan 15, 2020 11:23 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I thought that speed trim was cruise control to trim to constant speed? I had not heard that it was some kind of stall or pre stall avoidance. The original Speed/Mach trim function was created to account for the shift in neutral point as the Mach number increases and decreases, e.g. avoid Mach Tuck...

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by phollingsworth
Wed Jan 15, 2020 11:17 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

According to this guy at Leeham restarting production and getting up to speed again will take years: https://leehamnews.com/2020/01/15/boeing-hasnt-hit-bottom-yet-neither-have-suppliers/ The MAX fiasco puts Boeing so much behind Airbus in the narrowbody race, I wonder if Boeing will ever catch up? ...

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by phollingsworth
Wed Jan 15, 2020 11:09 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

so unbelivable ... what are you guys writing of here? one never ever needed augmentation of stickforce in any manual controlled airplane before the clown&monkey 737MAX Except the A300/A310. Peter Lemming presented a whole blog post on that system. please provide a source i dont find anything on...

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by phollingsworth
Wed Jan 15, 2020 10:51 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The LEAP program started in 2005 and LEAP engines were launched in 2008. Nine years is enough time to realize engines are too big. Visually for me, C-Series engines looked disproportionately big for the frame, how is it handling CG issues? The LEAP programme is different from the LEAP-1B which is a...

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by phollingsworth
Wed Jan 15, 2020 9:34 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I thought that speed trim was cruise control to trim to constant speed? I had not heard that it was some kind of stall or pre stall avoidance. The original Speed/Mach trim function was created to account for the shift in neutral point as the Mach number increases and decreases, e.g. avoid Mach Tuck...

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by phollingsworth
Tue Jan 14, 2020 4:18 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The LEAP program started in 2005 and LEAP engines were launched in 2008. Nine years is enough time to realize engines are too big. Visually for me, C-Series engines looked disproportionately big for the frame, how is it handling CG issues? The LEAP programme is different from the LEAP-1B which is a...

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by phollingsworth
Tue Jan 14, 2020 3:03 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

....Without having access to Boeing's specific tech trades it is really impossible to know where they would have sited the engines on a clean sheet design; and therefore, how much augmentation they would need. so unbelivable ... what are you guys writing of here? one never ever needed augmentation ...

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by phollingsworth
Tue Jan 14, 2020 9:01 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

What evidence do you have that is anything other than stick lightening? Please provide a source that says that. When EASA does get to fly it's tests hopefully later this week hopefully we will know for sure. I think the reason so many of us are skeptical of the extent of the lightening claims is th...

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by phollingsworth
Mon Jan 13, 2020 3:49 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Well since there's no such thing as fail-safe when it comes to statistics, let's please come back to reality. Regulations currently don't require 3+ for FBW systems. You're free to reference both EASA and FAA certification requirements. And again, as a software engineer myself who has to design and...

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by phollingsworth
Mon Jan 13, 2020 2:32 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

2 AoA sensors are ok only if the function can be disabled while maintaining safety. If the function have to still work with a failed AoA sensor, 3 AoA sensors will be required, but that one could eventually be a synthetic one. Incorrect. If an AoA fails and is detected as such, the system can easil...

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by phollingsworth
Mon Jan 13, 2020 2:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

The fact is a clean sheet design would not eliminate either of the two aerodynamic issues displayed by the MAX, ie the shift in effective aerodynamic centre at high AoA and stall identification. I am not privy to Boeing's technology curve and arsenal, but it is entirely reasonable to expect that ev...

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by phollingsworth
Mon Jan 13, 2020 11:59 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

This is an oversimplification but: those engines on those wings on that fuselage. There are hundreds of other posts that go into more detail but that is the inherent flaw. Boeing's 1st mistake, of many, was not doing a clean sheet design. Their 2nd mistake was not doing a clean sheet design... This...

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by phollingsworth
Mon Jan 13, 2020 11:56 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Problem is - this is exactly describing ugly stall characteristics. The way things work, arm controls force rather than position. Did you ever try non-spring loaded joysticks? Nightmare... So, the way trouble goes is: pilot pulls stick to what would be 10 deg AoA from 8 deg AoA, force goes down; ar...

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by phollingsworth
Mon Jan 13, 2020 11:25 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Not in all the new cases open by the MCAS on the 737-8/9 MAX: at some points the pilots loss the longitudinal control and this was actively hidden in the safety assessment by using obsolete assumptions that was not asserted and too later found wrong on that aircraft design. The question is, given t...

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by phollingsworth
Mon Jan 13, 2020 11:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

However, I do wonder what you believe are the inherent flaws of the 737MAX that are not present on all other modern airliners? This is an oversimplification but: those engines on those wings on that fuselage. There are hundreds of other posts that go into more detail but that is the inherent flaw. ...

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by phollingsworth
Mon Jan 13, 2020 9:11 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

This is an oversimplification but: those engines on those wings on that fuselage. There are hundreds of other posts that go into more detail but that is the inherent flaw. Boeing's 1st mistake, of many, was not doing a clean sheet design. Their 2nd mistake was not doing a clean sheet design... This...

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by phollingsworth
Fri Jan 10, 2020 4:39 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I will NEVER let my family fly the MAX, regardless of how this turns out. Got enough tin foil for that hat? WTF are you talking about? I am not suggesting some kind of conspiracy. I have been part of the A-Net community for 15 years and have been following the 737MAX issue from the beginning. I am ...

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by phollingsworth
Fri Jan 10, 2020 4:36 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

It is not, so far based on my readings Indonesian DGCA and Indian DGCA (both third world) demanded additional training. Boeing shamed them into submission to accept no training. Let see if I come access any info on Ethiopia. Ironically Forkner's statement about not being sure what three hours of si...

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by phollingsworth
Fri Jan 10, 2020 4:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

ET302 speed was below Vd when there tried the stab trim wheels. Safety regulators explicitly require longitudinal control at high speed up to Vd. They do for trimmed aircraft and specific mis-trim conditions (three-second movement of the longitudinal trim system at its normal rate for the particula...

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by phollingsworth
Fri Jan 10, 2020 4:24 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

I find people's willingness to re-fight this battle to be stunning. It should be clear by now that different people have different ways of evaluating events. Both FAA and Boeing have testified to Congress that MCAS put too much workload on the pilots. To me, such a statement opens questions of how ...

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by phollingsworth
Fri Jan 10, 2020 4:11 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounding, General Discussion Thread, January 2020
Replies: 1740
Views: 194254

Re: Boeing 737MAX Grounding, General Discussion Thread, January 2020

Stab trim cutout switch and use trim wheels, and this is exactly what ET302 did. You are forgetting disengage Auto Throttle and control your airspeed manually. ET302 speed was below Vd when there tried the stab trim wheels. Safety regulators explicitly require longitudinal control at high speed up ...

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