Search found 45 matches

by ExperimentalFTE
Tue Oct 22, 2019 10:48 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 1489
Views: 153921

Re: Boeing 737MAX Grounded Worldwide Q4 2019

I am more inclined to conclude that Mr. Forkner was perhaps laying unintentionally, which is unfortunate but in development cycle and certification cycle of an aircraft (taking into account that FAA didnt know specifics and operating principles and why's and how's of MCAS nor natural behaviour of th...

Jump to post
by ExperimentalFTE
Thu Oct 17, 2019 6:54 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 1489
Views: 153921

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Finally some real news: "A select group of US and international airline pilots are expected to participate in the final round of simulator testing of Boeing's new flight control system software for the 737 MAX as soon as early November... Once these crucial simulator tests conclude, which coul...

Jump to post
by ExperimentalFTE
Thu Oct 17, 2019 5:35 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 1489
Views: 153921

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Finally some real news: "A select group of US and international airline pilots are expected to participate in the final round of simulator testing of Boeing's new flight control system software for the 737 MAX as soon as early November... Once these crucial simulator tests conclude, which coul...

Jump to post
by ExperimentalFTE
Thu Oct 17, 2019 11:47 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 1489
Views: 153921

Re: Boeing 737MAX Grounded Worldwide Q4 2019

Lack of technical knowledge yet arguing about info found online is just plain stupid, as is comparing other platforms and cases without knowing all details... Anyhow, back to the MAX. As pointed out and strongly suggested in between words from JATR report. Other authorities want to clearly see "...

Jump to post
by ExperimentalFTE
Tue Oct 15, 2019 11:42 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q4 2019
Replies: 1489
Views: 153921

Re: Boeing 737MAX Grounded Worldwide Q4 2019

As I said, 7 months ago! https://www.airliners.net/forum/viewtopic.php?f=3&t=1417545&p=21189657&hilit=Experimentalfte#p21189657 I am starting to lean more and more to this being the reason why MCAS was required and implemented in first place: § 25.203 Stall characteristics. (a) It must b...

Jump to post
by ExperimentalFTE
Thu Sep 12, 2019 11:13 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Global regulatory scrutiny threatens Boeing's Max timeline: CEO https://www.flightglobal.com/news/articles/global-regulatory-scrutiny-threatens-boeings-max-ti-460806/ Well how nicely said (sarcasm).....Dennis, Dennis.....I wouldn't do that if I was you... I don’t really think anything Dennis said w...

Jump to post
by ExperimentalFTE
Thu Sep 12, 2019 10:53 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

https://www.flightglobal.com/news/artic ... ti-460806/

Well how nicely said (sarcasm).....Dennis, Dennis.....I wouldn't do that if I was you...
-->

Global regulatory scrutiny threatens Boeing's Max timeline: CEO

https://www.flightglobal.com/news/artic ... ti-460806/

Well how nicely said (sarcasm).....Dennis, Dennis.....I wouldn't do that if I was you...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 7:21 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Oh dear, no, not suggesting that nacelle lift is unsolvable...but I am suggesting that philosophy of solving it (as is) is completely unacceptable.... Seems like it is about to be accepted by FAA despite the high visibility created by the bad publicity, which would undermine your statement about co...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 6:25 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

You are underestimating lot of very smart engineers in Boeing.... Are you trying to tell me that this hasn't been seen during wind tunnel testing while they were counting drag counts and trying to come up with performance guarantees for customers? Are you telling me that noone did approach to stall...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 5:31 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Hyperbole. Marketing is not as ignorant of engineering issues as you suggest. They would have largely known the challenges of doing a clean sheet NSA in 2011. They may not have known issues related to MAX and nacelle lift but they would have known there were going to be engine integration issues an...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 3:49 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Very nice summary! However it dies appear that you are advocating that market and customers belong to Boeing and you use that to justify idiotic program and business decisions of the modern school of management! Hey, they F-ED up big time that is bottom line.....just as they screwed others in the m...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 3:28 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The reality was that the customers were not willing to wait the amount of time it was going to take to do a NSA nor were they willing to pay what it would cost to produce it, nor sacrifice compatibility with all the 737 training and spares they had already purchased for what was probably not a sign...

Jump to post
by ExperimentalFTE
Wed Sep 11, 2019 3:09 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The fact that the MCAS design was totally botched does not undo the market verdict that the MAX was the preferred product. I normally enjoy your posts, but that just sounds like a bad excuse. The reality was that the customers were not willing to wait the amount of time it was going to take to do a...

Jump to post
by ExperimentalFTE
Tue Sep 10, 2019 12:36 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Don't discount that part of the EASA statements could be posturing. With the exception of MCAS (and the related stick force gradient) and accidentally leaving the AoA disagree alert out, all of the other issues on the MAX also exist on the NG. It is perfectly fine for the EASA to require tests with...

Jump to post
by ExperimentalFTE
Tue Sep 10, 2019 11:32 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Situation between FAA and EASA and OTHER Certification authorities is very complicated now. Undeniable fact is that before both crashes different cert authorities were questioning certification of the MCAS and that even official statements of concern have been issued to FAA.....and were blown away v...

Jump to post
by ExperimentalFTE
Thu Sep 05, 2019 7:21 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

And I have to clarify few more things. It is not a question of aggresive maneuvers.....more it boils down to speeds at which someone might execute tight turn to final while he is slowing down, or for example windshear encounters, but above all it is margin from that point (stall) which is fixed and...

Jump to post
by ExperimentalFTE
Thu Sep 05, 2019 5:54 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

And I have to clarify few more things. It is not a question of aggresive maneuvers.....more it boils down to speeds at which someone might execute tight turn to final while he is slowing down, or for example windshear encounters, but above all it is margin from that point (stall) which is fixed and ...

Jump to post
by ExperimentalFTE
Thu Sep 05, 2019 5:51 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

The aircraft is demonstrated to fly fine and not fall out of the sky under normal flight conditions simply based on the fact that JT043 flew for over an hour with no MCAS and using the manual trim wheel. I assume that if there were controllability issues, that would have been documented in the prel...

Jump to post
by ExperimentalFTE
Thu Sep 05, 2019 4:52 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q3 2019
Replies: 4377
Views: 591845

Re: Boeing 737MAX Grounded Worldwide Q3 2019

Point is, EASA wants to see first hand "natural" behavior of the airplane during wind-up-turn and at higher AoA. This will then easily reflect criticality of MCAS failure....very simple. It is pointless that some users here are debating and advocating necessity of WUT demonstrations and hi...

Jump to post
by ExperimentalFTE
Wed May 29, 2019 12:11 pm
Forum: Civil Aviation
Topic: A220 gets 2.3T MTOW increase
Replies: 246
Views: 38021

Re: A220 gets 2.3T MTOW increase

Looking at what Lear 85 was supposed to be and deliver on the aircraft level and associated technology with it, no doubt that it is actually biggest failure in aviation history from the bang vs buck burned. 2.5B writeoff for 8 pax biz jet with nothing special and distinctive on the market...... Last...

Jump to post
by ExperimentalFTE
Wed May 29, 2019 10:55 am
Forum: Civil Aviation
Topic: Airbus 50 Years Celebration - 5 things Airbus got right and 5 it did not
Replies: 83
Views: 12719

Re: Airbus 50 Years Celebration - 5 things Airbus got right and 5 it did not

Olddog wrote:
The A220 looks like a toy put here just for the joke :)


Yeah, but keep in mind that it is leading the fleet during flypast.....

Looks to me more like a "tip of the spear" than a toy!

Cheers

Jump to post
by ExperimentalFTE
Tue May 28, 2019 10:44 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 392007

Re: Boeing 737MAX Grounded Worldwide Q2 2019

@7BOEING7 @OldAeroGuy Since the FAA agreed in principle with what MACS 1.0 was meant to do, probably flew some of the MCAS 1.0 flights and will do the same with MCAS 2.0, irrespective of the issues they presently have, I would defer to them relative to the interpretation of the FAR's -- this is sort...

Jump to post
by ExperimentalFTE
Mon May 27, 2019 8:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 392007

Re: Boeing 737MAX Grounded Worldwide Q2 2019

-Cannot obtain meaningful voting on the validity of the data source, it is either OP or INOP. -Cannot achieve failure rate (typ 10^-9) for critical flight control components and thus probability vs severity wrt stalling and departure from controlled flight. -Without it aircraft is still uncertifiab...

Jump to post
by ExperimentalFTE
Mon May 27, 2019 12:47 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 392007

Re: Boeing 737MAX Grounded Worldwide Q2 2019

I personally think that with current hardware configuration functionality you mention for MCAS 2.0 is as uncertifiable as it gets. Please explain why you think that MCAS 2.0 as described is not certifiable. -Cannot obtain meaningful voting on the validity of the data source, it is either OP or INOP...

Jump to post
by ExperimentalFTE
Mon May 27, 2019 11:43 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 392007

Re: Boeing 737MAX Grounded Worldwide Q2 2019

furthermore, MCAS 2.0 will turn itself off *by design* after activating once. So, after the "protection" is needed once, it will not be available again (not clear for how long). I think you're incorrect on how MCAS 2.0 will function. - MCAS 2.0 will activate once when both AoA vanes excee...

Jump to post
by ExperimentalFTE
Thu Apr 11, 2019 4:31 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

The NYT article also says: After the test flights began in early 2016, Boeing pilots found that just before a stall at various speeds, the Max handled less predictably than they wanted. So they suggested using MCAS for those scenarios, too, according to one former employee with direct knowledge of ...

Jump to post
by ExperimentalFTE
Thu Apr 11, 2019 10:20 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

So we got to hair splitting what feedback means. IMO feedback is feeding back to you an reaction to your input into a system. So the spring load in a joystick is in no way a feedback. It is a spring load not connected to the input in the system and the reaction of the system to your input. My discl...

Jump to post
by ExperimentalFTE
Mon Apr 08, 2019 12:37 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

There are several fundamental shortcomings in the architecture and implementation of MCAS. The standards that MCAS should have been built to exist for a reason. There is simply no way that the people putting it together were not aware they were making serious (and multiple) violations of FAR25 and ...

Jump to post
by ExperimentalFTE
Tue Mar 19, 2019 4:32 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

Based on the history of crashes, MCAS implications and seriousness of the situation and how certification was handled, I see as very realistic scenario where authorities would want to see just how much is that "slight pitch up tendency" during approach to stall and high AoA, meaning they w...

Jump to post
by ExperimentalFTE
Mon Mar 18, 2019 5:13 pm
Forum: Civil Aviation
Topic: The folding wings of the B777-9
Replies: 92
Views: 18598

Re: The folding wings of the B777-9

So I have to say (in lue of MAX circus) that I am very curious to see failure case analysis for folding wingtips and probability and severity of those. Say what happens if one folds in flight and other remains extended? Totally legit and reasonable failure in line with flaps skew and misalignment.....

Jump to post
by ExperimentalFTE
Mon Mar 18, 2019 5:02 pm
Forum: Civil Aviation
Topic: The folding wings of the B777-9
Replies: 92
Views: 18598

Re: The folding wings of the B777-9

So I have to say (in lue of MAX circus) that I am very curious to see failure case analysis for folding wingtips and probability and severity of those. Say what happens if one folds in flight and other remains extended? Totally legit and reasonable failure in line with flaps skew and misalignment......

Jump to post
by ExperimentalFTE
Sun Mar 17, 2019 4:55 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

https://www.seattletimes.com/business/boeing-aerospace/failed-certification-faa-missed-safety-issues-in-the-737-max-system-implicated-in-the-lion-air-crash/ This probably should be posted in most of the MAX crash threads here. Gates specifically points to three major problems with the MAX, and his ...

Jump to post
by ExperimentalFTE
Sat Mar 16, 2019 4:49 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

It is very puzzling to me how Boeing plans to come up with software fix for something that first of all has a problem architecture and hardware wise.....and furthermore how in the world FAA can sign off on that in 10 days???

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 6:17 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

Agree with you 100%. Adding more washout to the wing would only increase the drag penalty and negate an fuel savings achieved over the range the MAX operates. Also, most stabilizers given their symmetrical profile are angled at a negative incidence angle to produce a positive moment at zero alpha w...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 6:00 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

I understand the presumption, however cert requirements for stall characteristics are very very clear, and I afraid that this is what was driving necessity for MCAS and not unified pilot training. Having said that I am not clear how would this still be acceptable since disabling MCAS for various re...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 4:37 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

I just read an article on AP regarding the FAA delegating so much certification work to the manufacturer because of a lack of resources and so as to focus on "safety critical issues". I was appalled that in the 80's the FAA did 70-75% and by the time the 747-400 came out in 89 Boeing did ...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 3:34 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

I just read an article on AP regarding the FAA delegating so much certification work to the manufacturer because of a lack of resources and so as to focus on "safety critical issues". I was appalled that in the 80's the FAA did 70-75% and by the time the 747-400 came out in 89 Boeing did ...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 11:44 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

As to 3 AOAs. There have been instances where a A320 family member has 2 AOAs freeze in the same position which kicked off the alpha protection in normal law. The 3 AOAs are not average, they vote, and 2 of 3 had identical information but bad information. Hence Airbus pilots with that system have a...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 11:36 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

Tricky software fixes don't come sooner with more people, that actually makes it worse. There are probably just a couple of senior devs working on this in Boeing, along with the hardware systems experts and a billion project 'stakeholders'. Testing it is going to be the big issue, both in the sim a...

Jump to post
by ExperimentalFTE
Fri Mar 15, 2019 10:46 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 721335

Re: B737MAX Grounded Worldwide

Very sorry for tragic loss of life and folks onboard both aircraft.

But I cant help myself with impression that this feels like the worst CSeries karma on Boeing...

Gravity of this situation will have tremendous impact on Boeing, industry, cert authorities, airlines and travelers....

Jump to post
by ExperimentalFTE
Tue Mar 12, 2019 2:26 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

It would be very interesting to understand rationale and approach to how MCAS and flight controls with MCAS using single source air data was approved for certification...

Jump to post
by ExperimentalFTE
Mon Mar 11, 2019 3:04 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Let's say Lion Air crash was caused by bad data fed to MCAS. Immediately after the crash everyone ( airlines, pilots, aviation enthusiasts ) knew about the MCAS system. Every MAX operator should have immediately informed/trained their pilots what to do in case of such a failure. There is enough tim...

Jump to post
by ExperimentalFTE
Mon Mar 11, 2019 11:19 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

On a related note, here is a question. What if the temporary fix was to restrict the engine thrust a bit? Would it prevent the nose up attitude and minimise the tendencies of MCAS kicking in ? (Apart from this not being in line with the payload/range considerations of the airplane design etc) The p...

Jump to post
by ExperimentalFTE
Sun Mar 10, 2019 10:36 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

25.1309 (b) The aircraft systems and associated components, considered separately and in relation to other systems, must be designed so that: (1) Any catastrophic failure condition (i) is extremely improbable; and (ii) does not result from a single failure; and (2) Any hazardous failure condition i...

Jump to post
by ExperimentalFTE
Sun Mar 10, 2019 9:51 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722513

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Lot of speculation and guessing going on here I must say.... so sorry for the loss of life...

Jump to post