Search found 321 matches

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by WPIAeroGuy
Fri Oct 23, 2020 2:20 am
Forum: Civil Aviation
Topic: EasyJet Electric Aircraft: Engine Test by 2023, Aircraft in Service 2030
Replies: 80
Views: 11359

Re: EasyJet Electric Aircraft: Engine Test by 2023, Aircraft in Service 2030

I can't wait for the day when electric aircraft are the norm. However, this just seems like a PR stunt. A radical new configuration is not going to be what makes electric aircraft viable. When battery energy density reaches a point where it can compete 1:1 with fossil fuels then we will see aircraf...

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by WPIAeroGuy
Wed Mar 04, 2020 10:51 pm
Forum: Civil Aviation
Topic: EasyJet Electric Aircraft: Engine Test by 2023, Aircraft in Service 2030
Replies: 80
Views: 11359

Re: EasyJet Electric Aircraft: Engine Test by 2023, Aircraft in Service 2030

I can't wait for the day when electric aircraft are the norm. However, this just seems like a PR stunt. A radical new configuration is not going to be what makes electric aircraft viable. When battery energy density reaches a point where it can compete 1:1 with fossil fuels then we will see aircraft...

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by WPIAeroGuy
Thu Jan 09, 2020 12:23 am
Forum: Civil Aviation
Topic: Iran admits to accidentally shooting down Ukraine Flight 752
Replies: 2728
Views: 297649

Re: Reports of Ukrainian 737 Crash in Tehran,Iran

https://www.reuters.com/article/us-iran-crash/boeing-jet-crashes-in-iran-with-no-survivors-security-sources-see-technical-cause-idUSKBN1Z70EL I could understand security services saying they didn’t have evidence of a missile attack, but it seems strange they would make the positive statement about ...

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by WPIAeroGuy
Sun Jan 05, 2020 4:15 am
Forum: Technical/Operations
Topic: Piaggio P.180 Avanti
Replies: 45
Views: 6889

Re: Piaggio P.180 Avanti

One advantage of the three-surface design is that you can minimize trim drag at any CG location. In a conventional airplane or a canard, the horizontal stabilizer/canard will be loaded higher or lower depending on the CG location, which affects the trim drag. There are a lot of other aerodynamic con...

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by WPIAeroGuy
Sat Jan 04, 2020 2:58 am
Forum: Technical/Operations
Topic: When is too much wing flex bad?
Replies: 33
Views: 6890

Re: When is too much wing flex bad?

Wing flex to a point is good, energy absorption reduces forces for that loading toward the average load condition. Geometry issues come into play, do all the control surfaces operate without binding is essential. Also, a negative of flexibility is harmonics, often flexible structures have a period ...

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by WPIAeroGuy
Fri Nov 15, 2019 1:16 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

So the posters who are saying the MAX is unstable without including your "unusual high angle of attack" caveat are incorrect? Yes - based on the evidence we have it is not unstable - and may not be unstable close to stall with flaps up - it's just the stick force gets lighter than it is a...

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by WPIAeroGuy
Thu Nov 14, 2019 3:35 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Contrary to the hyperbole we've read in these threads, there's never been any documented evidence that the MAX pitches up , or is unstable or uncontrollable. The evidence is that MCAS commands nose down stabilizer to enhance pitch characteristics with flaps up during elevated angles of attack. (acc...

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by WPIAeroGuy
Thu Nov 14, 2019 3:19 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

§ 25.203 Stall characteristics. (a) It must be possible to produce and to correct roll and yaw by unreversed use of the aileron and rudder controls, up to the time the airplane is stalled. No abnormal nose-up pitching may occur. The longitudinal control force must be positive up to and throughout t...

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by WPIAeroGuy
Fri Oct 25, 2019 2:34 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

I don't disagree - the Root cause of MAX grounding is MCAS crappy design - and it should be grounded as the assumed state of Pilot Proficiency does not exist to handle an emergency like MCAS. Thats correct. Coming to that conclusion earlier would have safed you the effort to write hundreds of posts...

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by WPIAeroGuy
Fri Oct 25, 2019 2:20 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Mjoelnir, you said: MCAS at slow speeds moves the stabilizer to point the nose down. It moves the stabilizer in the AND direction. Would you say speed trim points the nose down as the aircraft accelerates? You're using inflammatory language to create an emotional response rather than a logical one. ...

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by WPIAeroGuy
Thu Oct 24, 2019 2:56 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

MCAS trims at an higher speed than the manual electrical trim. Anyway, it is not about a slow or fast action. If you want to use a system that is already there, STS is the only system you can use. And I assume MCAS fast made as fast as possible. And once more, MCAS was first not developed for low s...

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by WPIAeroGuy
Thu Oct 24, 2019 1:51 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Such statement is very hard to believe. Remember, all that "stick force" argument completely ignores simulated nature of stick force in 737. Either airflow in MAX vs NG renders tail mounted Pitot inefficient - indicating significant change in aerodynamics; or airplane actually responds to...

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by WPIAeroGuy
Thu Oct 10, 2019 1:54 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

Can I ask you, what the exact definition of stall is in aviation? Perhaps this can help? http://www.aerospaceweb.org/question/aerodynamics/q0136.shtml In addition, Thin Airfoil Theory doesn't account for the fact that the lift coefficient eventually reaches a maximum and then starts decreasing. The...

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by WPIAeroGuy
Sat Oct 05, 2019 12:50 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

To add to the above, by definition you cannot stall below the critical AoA even if your speed is below the ‘stall speed’. Stall is the point at which increasing the AoA does not increase lift and is caused by excessive flow separation from the wing. Stall speed is a function of aircraft weight and h...

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by WPIAeroGuy
Sat Oct 05, 2019 12:47 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

Stall is AoA and only AoA dependent. Stall speed is an analog for measuring AoA and varies with weight. If you exceed critical AoA, regardless of speed you will stall. At low speeds, you need to maintain a higher AoA because your lift coefficient Cl varies approximately linearly with AoA. Lift = Cl*...

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by WPIAeroGuy
Fri Oct 04, 2019 8:28 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019, Production suspended
Replies: 5670
Views: 749293

Re: Boeing 737MAX Grounded Worldwide Q4 2019

This is one of the important elements of this story. If EICAS was already developed for the P-8 (737-800) - although not FAA certified - it means implementing the original MCAS from the 767 tankers would likely have been much easier and straight forward. The $10 billion figure sounds incredibly hig...

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by WPIAeroGuy
Fri Oct 04, 2019 8:21 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

Quote from the Leeham article: The AD and the explanation from Airbus singles out recently changed flight laws in the ELACs for the A321neo to be the root cause for the pitch-up described in the AD. It allows the Pilot to command fast dynamic pitch ups when in Flare mode (which is just before landin...

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by WPIAeroGuy
Thu Oct 03, 2019 4:11 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

https://leehamnews.com/2019/07/19/bjorn ... -up-issue/

Suggest you re read this. The whole issue was alpha protection was NOT able to prevent this under certain conditions.
-->

https://leehamnews.com/2019/07/19/bjorn ... -up-issue/

Suggest you re read this. The whole issue was alpha protection was NOT able to prevent this under certain conditions.

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by WPIAeroGuy
Thu Oct 03, 2019 12:10 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

I do think there is a bit of talking past each other. Yes, speed has a 2nd order impact on stall (reducing speed reduces the local Reynolds number which shifts stall location a tiny bit). I think the concern was a sudden loss of lift ehich, since more change AoA is required to acheive the desired l...

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by WPIAeroGuy
Wed Oct 02, 2019 11:07 pm
Forum: Civil Aviation
Topic: B17 Crash at BDL October 2nd, 2019
Replies: 165
Views: 41640

Re: B17 Crash at BDL October 2nd, 2019

I just flew on her recently. Was an amazing experience. My condolences to the passengers and crew. Absolutely terrible situation.

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by WPIAeroGuy
Thu Sep 26, 2019 11:52 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

Stall speeds are just representations of AoA and will vary with aircraft weight, but will be constant at AOA, icing notwithstanding because now you’re changing the airfoil shape. A light airplane will respond to elevator/pitch input faster (lower moment of inertia) and the application of thrust will...

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by WPIAeroGuy
Thu Sep 26, 2019 3:21 am
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

I think in this case it is semantics: An aircraft pitches upwards, so it increases its pitch and AoA, it does not angle up. You could write it increases its angle of attack but that also increases pitch during the flare (pitch is in general really low in this phase, I think 0-10)°. Anyway during fl...

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by WPIAeroGuy
Wed Sep 25, 2019 9:41 pm
Forum: Civil Aviation
Topic: A320neo Family 'Excessive Pitch' Issue Thread
Replies: 215
Views: 53134

Re: A320neo Family 'Excessive Pitch' Issue Thread

How much exceeded I could not tell either, never saw this but the condition is given: It occurs when the aircraft is in flare mode. @ VV If pitch becomes to big, or too high too fast, it could possibly lead to a stall. It takes time to spool up the engines and develop maximum thrust. If the pitch b...

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by WPIAeroGuy
Wed Sep 25, 2019 10:27 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

So you really took from WPIAeroGuy post that he disagreed with anything you just posted, unless I missed his intent, it seemed to me that he was saying that the need for pilots to understand the basics of flight is still required despite the improvement in technology, and as we have seen, pilots ha...

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by WPIAeroGuy
Wed Sep 25, 2019 12:08 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Bingo! So when things go crazy, what do you expect from a pilot? From a safety assessment point of view, the goal is to find a safe solution for every possible failures. Most failures can be mitigated at the system level, mainly by redundancy, and only if there not practicable solution at the syste...

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by WPIAeroGuy
Tue Sep 24, 2019 1:14 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

They couldn't predict the failure of the pilots not the sensor. Could, and moreover - should have done so; and hopefully will face consequences on both corporate and personal level for failure to do so. I could not disagree more. I'm sorry, but if you're an engineer in 2012 there is no way in hell ...

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by WPIAeroGuy
Mon Sep 23, 2019 11:51 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

[...] 2a. While everyone is looking at this crash with 20/20 hindsight, imagine your an engineer at Boeing circa 2012. I feel like no one actually understands how hard it would be to not only predict this failure mode, but convince superiors it was dangerous enough to warrant a redesign. Let's pret...

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by WPIAeroGuy
Mon Sep 23, 2019 12:29 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I haven't posted in this thread in a while, but I've been following along. I've been meaning to post this for a while, hopefully it brings a slightly different perspective to the existing ideas. 1. In a hypothetical situation, let's say a Part 23 airplane has an engine failure at Vr that results in...

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by WPIAeroGuy
Sun Sep 22, 2019 10:56 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4380
Views: 676289

Re: Boeing 737MAX Grounded Worldwide Q3 2019

I haven't posted in this thread in a while, but I've been following along. I've been meaning to post this for a while, hopefully it brings a slightly different perspective to the existing ideas. 1. In a hypothetical situation, let's say a Part 23 airplane has an engine failure at Vr that results in ...

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by WPIAeroGuy
Wed May 22, 2019 1:17 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Wrong. It is the result of a crew in an horrible situation who didn't monitor their speed, care or know to turn off the auto-throttle. Boeing can thrive on this gross negligence. Thrust has far less influence on speed than pitch, reducing thrust pitches the nose further down. Again a red herring in...

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by WPIAeroGuy
Wed May 15, 2019 10:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

One defect with 4 aircraft generations of 737, is the latest iteration uses the previous iteration as the baseline (plus scaling), not the 100/200 for which the original type certificate is held. STC's should be capped at two or maybe three generations. New generation 737s are not STCs. They are ad...

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by WPIAeroGuy
Fri May 10, 2019 8:07 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

See here: https://youtu.be/QytfYyHmxtc?t=2120 "We knew that FAA would not certify 2 sensor setup without level D training" I’ve seen this stated before, and I’m not doubting it’s true, but what is the logic behind it? Why would two sensor inputs require sim time while 1 does not? I’m not ...

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by WPIAeroGuy
Sun May 05, 2019 1:44 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The one big difference with runaway trim is that if you hold the column in position to maintain attitude, ideally that stops the runaway — doesn’t work for MCAS. But I agree with what you say. Good point, I forgot about the column cutout switch. You guys are focusing on microproblems of design. Loo...

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by WPIAeroGuy
Sun May 05, 2019 12:40 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

training seems as efficient as it can be. It is hard, if at all possible, to train instant responses. And you're proposing totally unrealistic spending. WHat may make sense, though, is better engineering education (there is some progress lately, but it is slow). A much more cost efficient approach....

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by WPIAeroGuy
Sat May 04, 2019 11:55 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 419885

Re: Boeing 737MAX Grounded Worldwide Q2 2019

No - I have always held lots of blame to go around - If I've had an Agenda it's to get people to realize that training has been lacking Worldwide and needs to be looked at - along with Boeing and the FAA training seems as efficient as it can be. It is hard, if at all possible, to train instant resp...

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by WPIAeroGuy
Sun Apr 28, 2019 7:17 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Thank you BravoOne, that's very enlightening.

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by WPIAeroGuy
Sat Apr 27, 2019 4:16 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

It’s because morrisond and OldAeroGuy are correct and are using the aerodynamic definition of stability. Stability has NOTHING to do with control feel. The reason those two are being so ‘stubborn’ is because there’s a huge physical difference between a stable and an unstable plane. The F-117A was u...

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by WPIAeroGuy
Sat Apr 27, 2019 12:41 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

morrisond wrote: Well the bizarre thing is MCAS isn't really needed to make the MAX safe - it's just needed MCAS to meet a specific regulation that the MAX was barely over on. It's pretty clear by now morrisond and OldAeroGuy are either engaged in astroturfing or self identify with Boeing to the po...

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by WPIAeroGuy
Thu Apr 25, 2019 8:43 pm
Forum: Civil Aviation
Topic: United Airlines "Evolution" to Globe Livery released
Replies: 1797
Views: 387064

Re: United Airlines "Evolution" to Globe Livery released

While better than the current, it's unfortunate they did not push the thinking further...for example, if you have a light blue and medium blue tail, why not incorporate more of that light blue on the rest of the fuselage to harmonize. For example, maybe use light blue as shadow on the UNITED titles...

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by WPIAeroGuy
Tue Apr 23, 2019 9:45 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Airplanes don’t just stall, two good engines, pitch angle (confirmed on both sides and the standby) around 12-14 degrees, ground going away—it’s flying regardless of stick shakers, MCAS, other warnings. I flew a military plane that had a well known procedure for stall warning, if it was flying turn...

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by WPIAeroGuy
Tue Apr 23, 2019 9:44 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

[threeid][/threeid] Airplanes don’t just stall, two good engines, pitch angle (confirmed on both sides and the standby) around 12-14 degrees, ground going away—it’s flying regardless of stick shakers, MCAS, other warnings. I flew a military plane that had a well known procedure for stall warning, if...

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by WPIAeroGuy
Tue Apr 23, 2019 9:29 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

I'd like to break the endless back and forth that is going for the last 10 pages, and leads nowhere. Instead, please answer the question: what would be an effect of SINGLE (one time, 2.5deg down) false MCAS activation at low altitude. Say, shortly after take-off. How quickly do you think a prepared...

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by WPIAeroGuy
Tue Apr 23, 2019 12:37 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Can you show "stall prevention system" being defined in a real document? I cannot find any definition which would be relevant to certification issues. I couldn't find a formal definition in Part 25, but I think the difference that people are trying to get across is that a "stall prev...

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by WPIAeroGuy
Mon Apr 22, 2019 11:39 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

I think what people have been saying is "stall prevention systems" have a very specific definition. MCAS does not meet that definition. It is about stall prevention, but that is not quite the same. And the Red Queen says ..... LOL Can you show "stall prevention system" being def...

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by WPIAeroGuy
Mon Apr 22, 2019 10:32 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

OldAeroGuy and Galaxyflyer, thanks for all of you're patience. I'm sure there are many on here that read what you post, and try to learn from it. Others it seems , look for fault in your answers, and will continually ask over and over again, the same question looking for a different interpretation ...

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by WPIAeroGuy
Sun Apr 21, 2019 11:14 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Boeing’s rushed attempt to counter the NEO produced an aircraft that is inherently unstable. Do you have any data or a source to support your statement? Adding MCAS to solve an approach to stall "stick lightening" handling issue does not mean the MAX is "inherently unstable". He...

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by WPIAeroGuy
Fri Apr 19, 2019 8:21 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

MCAS was a commercial requirement, not an engineering requirement. It was added so that Max handling characteristics was same as NG, to prevent additional training which could cost Boeing sales or reduced profits. Why introduce additional points of failure even though it *might* have been mitigated...

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by WPIAeroGuy
Fri Apr 19, 2019 8:19 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Definition of safety engineering: Safety engineering is the process of design o prevent accidents. Engineering Safety Concepts provide detailed approaches and modes for accident reduction by using a risk management process to identify and "design out" hazards. Do Boeing employ "unsaf...

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by WPIAeroGuy
Fri Apr 19, 2019 7:55 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

Amiga500 wrote:
WPIAeroGuy wrote:
What do you mean 'to begin with?'


That is blindingly obvious.

Lets start with 1 sensor input.


I was asking XRAYretired to clarify if he was referring to the concept of a 737MAX being unsafe or specifically MCAS implementation. It is now clear he meant MCAS implementation.

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by WPIAeroGuy
Fri Apr 19, 2019 6:44 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757528

Re: B737MAX Grounded Worldwide

So the 5 failure modes that can cause stab runaway on NG - are they serious and can they bring a plane down. And how often do they happen? The 6th failure we already know is serious and can bring planes down. No doubt we can reduce the amount of times it fails. And no doubt we can reduce how strong...

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