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by kalvado
Wed Jun 12, 2019 2:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

We would have a hard time justifying a human based control having a PFD of less than 0.1. If the safety case has a low initiating event frequency, multiple layers of protection, and you end up with an acceptable residual risk then that’s fine - in other words, in the NG case, people can be a long w...

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by kalvado
Wed Jun 12, 2019 12:46 pm
Forum: Civil Aviation
Topic: Confirmed: 777X First Flight Delayed Due GE9X Issues
Replies: 318
Views: 70799

Re: Rumour: 777X First Flight Likely Delayed to Year End Due GE9X Issues

And there are plenty of reasons 779 is not A380: o 20% fewer passengers than A380 so easier to fill without trashing yields 787-9 has fewer passengers than 779 so easier to fill without trashing yields A321 787-9 has fewer passengers than 787-9 so easier to fill without trashing yields .... ..... B...

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by kalvado
Wed Jun 12, 2019 12:01 pm
Forum: Civil Aviation
Topic: Confirmed: 777X First Flight Delayed Due GE9X Issues
Replies: 318
Views: 70799

Re: Rumour: 777X First Flight Likely Delayed to Year End Due GE9X Issues

And there are plenty of reasons 779 is not A380: o 20% fewer passengers than A380 so easier to fill without trashing yields 787-9 has fewer passengers than 779 so easier to fill without trashing yields A321 787-9 has fewer passengers than 787-9 so easier to fill without trashing yields .... ..... B...

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by kalvado
Wed Jun 12, 2019 11:42 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The thumb switch has priority over automatic trim. If what you say is likely then using manual electric trim wouldn't be part of the procedure on the NG or earlier. The way the procedure is written, it seems to me that Boeing believes most runaway stabilizer events would be caused by automatic trim...

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by kalvado
Wed Jun 12, 2019 11:25 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The Software patch is there, it's only the certification that takes longer then Boeing expected. I think that the technical issues of the MAX and the issues surrounding the certification are 2 different processes. The fix for the software is there, and will probably be working as it should making t...

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by kalvado
Wed Jun 12, 2019 11:17 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

This is not true. First, it is possible and likely that the thumb switch can be used to electrically trim before cutting off electric trim. This is part of the NG (and MAX) procedure. Second, although described differently the "roller coaster" procedure is still in the NG training manual....

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by kalvado
Wed Jun 12, 2019 11:03 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Preferably with pilots that are trained properly and can handle runaway stabilizer on both. Unless trim is accomplished only with the manual trim wheel, the incidence of runaway stabilizer will never be zero. If I'm on the 1 in 100,000,000 flight where it happens, I pray the pilots have the skill a...

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by kalvado
Wed Jun 12, 2019 10:51 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

So we need the incidence or having to use trim on Max 737 to be as low as on the NG to be able to maintain safety levels? Preferably with pilots that are trained properly and can handle runaway stabilizer on both. Unless trim is accomplished only with the manual trim wheel, the incidence of runaway...

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by kalvado
Wed Jun 12, 2019 12:37 am
Forum: Civil Aviation
Topic: UA Will Now Hold Flights for Connects
Replies: 68
Views: 9962

Re: UA Will Now Hold Flights for Connects

depending on implementation, this can become the greatest thing since sliced bread, a total nightmare, or anything in between. Departure hold has to be accommodated either by delay down the line or by block time engineering. If it is about short delays, when pax run to the gate to see the pushback, ...

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by kalvado
Tue Jun 11, 2019 4:05 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I believe A320 fuselage is about same size and handles same size engines as MAX without extra issues. I think you are nitpicking. You know what the problems is. Nader talks to masses and he needs to simplify the problem to the level of general folk. Problem is with meaningless use of word, which co...

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by kalvado
Tue Jun 11, 2019 2:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Can you explain how a plane with engines too big for the fuselage that needs software to fix issues with stability etc Can be as safe as the same plane with the right sized engines for the fuselage that doesnt need software to fix stability issues etc Somehow 737NG, with engines so big that nacelle...

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by kalvado
Tue Jun 11, 2019 2:02 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Can you explain how a plane with engines too big for the fuselage that needs software to fix issues with stability etc Can be as safe as the same plane with the right sized engines for the fuselage that doesnt need software to fix stability issues etc Somehow 737NG, with engines so big that nacelle...

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by kalvado
Mon Jun 10, 2019 3:26 pm
Forum: Civil Aviation
Topic: Confirmed: 777X First Flight Delayed Due GE9X Issues
Replies: 318
Views: 70799

Re: 777X First Flight Delayed to Year End Due GE9X Issues

Well, whatever it worth: https://www.reuters.com/article/us-boeing-777x/boeings-777x-faces-engine-snags-questions-rise-over-delivery-goal-idUSKCN1T62KU https://www.investors.com/news/ge-stock-ge9x-engine-issue-may-delay-boeing-777x/ https://finance.yahoo.com/news/revolutionary-boeing-777x-jet-runnin...

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by kalvado
Mon Jun 10, 2019 1:11 pm
Forum: Technical/Operations
Topic: Why can’t aircraft maximize fuselage space by using ceiling space?
Replies: 35
Views: 5167

Re: Why can’t aircraft maximize fuselage space by using ceiling space?

How much standing room would be available for the flight attendants to be able to work comfortably if you put the galleys above the cabin. Putting it below is one thing, you've got plenty of standing room there. Just turn it 90 degrees and place it longitudinally. There is enough space to stand up ...

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by kalvado
Mon Jun 10, 2019 10:13 am
Forum: Civil Aviation
Topic: MCAS on 737 - 10 MAX
Replies: 19
Views: 4112

Re: MCAS on 737 - 10 MAX

I've read several times that the -10 MAX will not have MCAS. Links? Plenty. If you search. Thanks for the other respondents. Isn't the first 10MAX in assembly? Could that model fly/be tested without the restrictions the other Maxes face? Depends on how -10 gets certified. If it is a derivative of o...

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by kalvado
Mon Jun 10, 2019 9:45 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Actually looking at it as a system... Just poor design all over. An indicator for event trigger is deemed uniportant. It should send to tw other checklists, none of them covering critical aspect of a problem. Problem diagnostics is reduced to guessing.. I know Boeing had been great few decades ago,...

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by kalvado
Mon Jun 10, 2019 12:54 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Why dispute what he is quoted as saying and then get it wrong when the quote is readily available? https://www.bbc.co.uk/news/business-48461110 This is the Chris Brady Quote- Chris Brady, a pilot and author of The Boeing 737 Technical Guide said: "I'm fairly confident that the Ethiopian Airlin...

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by kalvado
Sun Jun 09, 2019 12:02 am
Forum: Technical/Operations
Topic: Why can’t aircraft maximize fuselage space by using ceiling space?
Replies: 35
Views: 5167

Re: Why can’t aircraft maximize fuselage space by using ceiling space?

I've wondered since the inception ofthe 777 overhead crew rest modules why airlines didn't sell passenger space up there. Real bunks and more space trump lie flat seats. I guess that depends on your definition of more space, but judging by the pictures I've seen, you wouldn't really be able to stan...

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by kalvado
Sat Jun 08, 2019 6:37 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Anyone interested in when the storage of the MAX a/c start affecting the other programs that need the space, in particular the 787? Thankfully they have another location to produce the 787 that does not have space being taken up by the MAX a/c., can they increase the rate there, are the production ...

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by kalvado
Sat Jun 08, 2019 5:23 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

What you're showing in this example is the rate of force decrease, d^2F/da^2. I am referring to fig. 7.2 in AC 25-7D where "acceptable" curve (vs speed) shows that exact behavior - decrease of derivative to zero at the edge. You interpret such behavior (vs AoA) as unacceptable. So where d...

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by kalvado
Sat Jun 08, 2019 4:20 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

My apologies, but is there a specific reference for these interpretations? Our beloved 25-7 has graphs only for force vs speed, and all your examples would be acceptable if AoA is interpreted as "AoA required at given speed". Gradient as dF/dx doesn't change sign in your examples, and I d...

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by kalvado
Sat Jun 08, 2019 3:02 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The intent is to obtain enough data to determine the stall speed at an entry rate not exceeding 1.0 knot/second. I take it that means a deceleration of less than 1.0 knot/second to stall, during which the control pressure must increase. So the righting force curve went flat or up on the MAX in this...

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by kalvado
Fri Jun 07, 2019 8:32 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Your over the top language tries to conflate two very different things. Killing people is a crime and those who kill people should be made to stop even using drastic measures. Death traps on the other hand are all over us in everyday life. You like everybody else try and 99.9% time succeed in avoid...

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by kalvado
Fri Jun 07, 2019 2:45 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Then you've missed the replies that say Boeing caused the MAX to be a "Death Trap". Over the top language has been the hallmark rather the exception for this thread. Your over the top language tries to conflate two very different things. Killing people is a crime and those who kill people...

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by kalvado
Fri Jun 07, 2019 2:48 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

If people would stick to the facts it would be fine. But so many are speculating and act as if they are speaking the truth. You do not know the intentions of the FAA, NTSB, or Boeing's management team. There is no one evil at the Boeing company and making them sound like some supervillain in a movi...

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by kalvado
Wed Jun 05, 2019 7:15 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

I don’t deny that Boeing has a lot of work to do on reputation, but your comment about grandfathering everything in sight is amateurish. Have you read the multiple postings explaining how the cert basis works? Are you really familiar with how it works? Or are you just making an (incorrect) statemen...

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by kalvado
Wed Jun 05, 2019 2:30 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

So, we do have a medical fact: 777x will be certified as a derivative of 773ER. Another statement- there is no real use of grandfathering rights. So, what is the point of certification as derivative as opposed to a new type? Main point I can think of is crew training - so FAs can work both types (pr...

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by kalvado
Tue Jun 04, 2019 3:09 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Not heard much from our aerodynamics guys since the NYT article. I'm struggling with a number of aspects of what we have now read and I'm sure others would find it useful to be able better grasp the nuances. Perhaps, If I elucidate. It is reported MCAS V0.0, that as well as AOA high triggered, was ...

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by kalvado
Tue Jun 04, 2019 12:46 pm
Forum: Civil Aviation
Topic: Southwest 737 taking off from Paine Field today.
Replies: 11
Views: 4568

Re: Southwest 737 taking off from Paine Field today.

Was at Paine Field today and saw a Southwest 737 taking off. It looked like a MAX to me but I am not 100%. I wonder if Boeing is doing testing on the aircraft? Would make sense. Also, Boeing tour guide said that they fully trust the CEO and to keep him in our thoughts. Quite an interesting time for...

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by kalvado
Tue Jun 04, 2019 1:08 am
Forum: Civil Aviation
Topic: Boeing Wing Issue?
Replies: 21
Views: 6107

Re: Boeing Wing Issue?

For Pete's Sake! It's not even a Boeing issue! It's a supplier of a supplier issue! Buck stops at Boeing. This is an issue with Boeing plane, and it is up to Boeing to do safety and quality control of components - and handle the issue when things don't work. They may deal with the supplier all they...

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by kalvado
Mon Jun 03, 2019 9:34 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

They should fire him, if he is responsible for good profits, he is also responsible for this spectacular cock-up. He should take his responsibility, just to put some confidence back into the company because he took his responsibility. Get the big bucks, you also got thrown out when it goes wrong. I...

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by kalvado
Mon Jun 03, 2019 6:39 pm
Forum: Civil Aviation
Topic: Boeing Wing Issue?
Replies: 21
Views: 6107

Re: Boeing Wing Issue?

It might be considered a “non-issue” by some but really, just put this thing out of its misery. What else is going to come out in the wash? How many more people have to be killed before this plane is grounded for good? But then what do I know. As much as I love Boeing this is atrocious. 1. You real...

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by kalvado
Mon Jun 03, 2019 6:24 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I guess the only way we find out if anything else is messed up is when something else crashes? And if the crashes aren't happening we have to assume it's all ok? I'm happy enough to trust their existing planes (apart from Max of course). But would be worried about any new ones. Dreamliners have bee...

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by kalvado
Mon Jun 03, 2019 4:20 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

For a while now I've been thinking that the way MCAS was handled could be one of two options... either that somewhere along the line decisions were made intentionally to keep it low profile enough that it wouldn't require extra training, or that Boeing's internal org structure and processes have de...

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by kalvado
Mon Jun 03, 2019 2:24 pm
Forum: Civil Aviation
Topic: Boeing Wing Issue?
Replies: 21
Views: 6107

Re: Boeing Wing Issue?

Was mentioned in endless MAX-grounded thread already. My understanding that this is quality control and monitoring system at work: something undesired actually happened - but it was timely picked up, and will be properly addressed. Just another day in real world. UPD: a link which works for me: http...

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by kalvado
Mon Jun 03, 2019 11:33 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

A late change, and fatal flaws, in a Boeing jet design https://www.seattletimes.com/nation-world/a-late-change-and-fatal-flaws-in-a-boeing-jet-design/ So originally MCAS was designed to use two sensors, two different sensors. AoA and g-force. Reading this article, assuming that it is a true represe...

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by kalvado
Mon Jun 03, 2019 3:59 am
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

I sure hope so. After all, the current 777 has proven to have a very dangerous record. Oh wait, there has never been a fatal accident in 25 years that was proven to be the fault of the airplane design. The 777 is arguably the safest airplane ever designed. What ever kind of bitterness and vendetta ...

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by kalvado
Mon Jun 03, 2019 3:20 am
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

Now 777X buyers (EK) are looking at options to compensate further delayed EIS. Because of changes to the certification process. https://www.wsj.com/articles/buyers-of-boeings-newest-jet-fear-delays-11559451419 Why changes to the 777x certification process? It's good as is, but there's opportunity t...

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by kalvado
Mon Jun 03, 2019 12:41 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Ironically, Boeing is facing almost the same problem as pilots of crashed flights. There is something crazy going on, they lost control of events, and there is no understanding of where to go, as too many things are going on. A lot of deer in headlights looks both in c-suit and engineering offices ...

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by kalvado
Sun Jun 02, 2019 10:51 pm
Forum: Civil Aviation
Topic: KLM investing in TU Delft's Flying-V concept
Replies: 29
Views: 4981

Re: KLM investing in TU Delft's Flying-V concept

From the airline's perspective, this is 1% invested in engineering model, 40% spent on PR and 59% invested into young people who would work for the airline in years to come. KLM may know full well this will never pull to the gate; but guys and gals working on the concept will become qualified engine...

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by kalvado
Sun Jun 02, 2019 10:17 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

Yes, a fire would add an incentive. Do responses like these (see also 291), highlight safety has been discounted / ignored, reinforcing why airworthiness authorities need to review / re-review NG, MAX and X certification and grandfathering / exemption processes? Do you imply that the 90 second evac...

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by kalvado
Sun Jun 02, 2019 6:31 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

Which just happens to let the 737 squeak in. No one is going to jump six feet with any safety. I'd be lucky to jump two feet. Exactly. When I was a kid, jumping from 10' wasn't a problem. Now I'm 53 and I guess I could jump the 6' without problems. But I doubt I'll be able to do that when I'm 73. W...

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by kalvado
Sun Jun 02, 2019 5:42 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Which makes some sense based on data; however assuming that basic skills would make MCAS outcomes different is a very far-reaching conclusion. It's the opposite of far-fetched to assume that knowing how an airplane flies, knowing how your airplane operates, and knowing proper procedures to fly your...

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by kalvado
Sun Jun 02, 2019 12:36 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Does extended time mean a more robust fix? Or just red tape and skepticism in getting it re-certified? Ironically, Boeing is facing almost the same problem as pilots of crashed flights. There is something crazy going on, they lost control of events, and there is no understanding of where to go, as ...

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by kalvado
Sun Jun 02, 2019 12:16 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Emirates Tim Clark predicts that the B737MAX won't fly until after the Christmas Link: https://www.arabianbusiness.com/transport/421419-emirates-predicts-boeings-737-max-wont-fly-until-after-christmas The longer it takes, the better it will be. The worst thing Boeing could do is rush and make the s...

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by kalvado
Sat Jun 01, 2019 9:32 pm
Forum: Civil Aviation
Topic: Has grandfathering been taken too far?
Replies: 362
Views: 17368

Re: Has grandfathering been taken too far?

Yes, I was wondering about that too when traveling on a 738 and being seated at the overwing emergency exit. Opening the exit is easy, nobody has to handle the heavy door, but then one has to jump off the wing's trailing edge. How high is that? About two meters? I wonder why is this allowed. Here's...

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by kalvado
Sat Jun 01, 2019 8:45 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Here is a new article about the 737 MAX and MCAS. https://www.nytimes.com/2019/06/01/business/boeing-737-max-crash.html The point that was new to me was that Boeing discovered they could have low speed stalls as well as the high speed stalls that have been talked about. So they could not use a g fo...

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by kalvado
Sat Jun 01, 2019 8:14 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Here is a new article about the 737 MAX and MCAS. https://www.nytimes.com/2019/06/01/business/boeing-737-max-crash.html The point that was new to me was that Boeing discovered they could have low speed stalls as well as the high speed stalls that have been talked about. So they could not use a g fo...

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by kalvado
Sat Jun 01, 2019 4:30 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 387793

Re: Boeing 737MAX Grounded Worldwide Q2 2019

That was not what I was saying. If we ever get that level of detail, and I doubt it, I think we will find that the software design and implementation was validated as compliant with the requirements that were set. And it is the system design that was incompetent and driven by commercial imperatives...

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by kalvado
Sat Jun 01, 2019 3:24 pm
Forum: Civil Aviation
Topic: AA A321 clips AA 738 during pushback at LGA
Replies: 14
Views: 5154

Re: AA A321 clips AA 738 during pushback at LGA

AirKevin wrote:
Might be taking Boeing vs. Airbus a little too literally.

Yeah, while a big thing on a.net - I had an impression it doesn't normally spill to the ramp.....

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