Search found 233 matches

by dakota123
Fri May 10, 2019 5:44 pm
Forum: Civil Aviation
Topic: Something wrong with Boeing's safety culture?
Replies: 293
Views: 35584

Re: Something wrong with Boeing's safety culture?

Stop digging, PLEASE! Everyone is happy with blaming MBAs in management and want to let engineers do their job. Wha you say is that boeing's engineers are uncapable of understanding a concept of dual failure, trim runaway and airspeed disagree simultaneously - while an indicator, pointing at the ro...

Jump to post
by dakota123
Fri May 10, 2019 4:44 pm
Forum: Civil Aviation
Topic: Something wrong with Boeing's safety culture?
Replies: 293
Views: 35584

Re: Something wrong with Boeing's safety culture?

In the end it boils down to the risk analysis for a MCAS failure. If the whistle blowers are too believed, it does not look good for Boeing, as the risk seems to have been intentionally downplayed. No it wasn’t. More BS being posted on A.net. As I’ve explained before, the Fault Hazard Analysis show...

Jump to post
by dakota123
Wed May 01, 2019 4:27 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

As I understand it, the symptoms of MCAS failure and runaway trim are pretty much identical. Also as I understand it, solution for both is to deactivate the automatic trim and manually trim. Additionally, as I understand it, although there was not specific simulator training for MCAS failure, there...

Jump to post
by dakota123
Wed May 01, 2019 4:23 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

As I understand it, the symptoms of MCAS failure and runaway trim are pretty much identical. Also as I understand it, solution for both is to deactivate the automatic trim and manually trim. Additionally, as I understand it, although there was not specific simulator training for MCAS failure, there...

Jump to post
by dakota123
Wed May 01, 2019 4:16 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Why does everyone still seem to think that shit pilots with shit training share no blame in these accidents? Meh, six months from now no one will care or remember and likely the MAX will be the safest aircraft available. Please, yeehaw and floor it is the best response to a problem, no matter if yo...

Jump to post
by dakota123
Wed May 01, 2019 4:08 pm
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

Existing standard is a pretty vague definition. Boeing's claim just shows lack of expertise at the company. Existing standard requires that event with catastrophic consequences is below 1 in 1e-9. Their estimate of failure consequences was wrong, hence standard noncompliance. SO they designed for M...

Jump to post
by dakota123
Wed May 01, 2019 1:21 am
Forum: Travel, Polls & Preferences
Topic: Buying a ticket to an unknown destination and airline sends you where they want.
Replies: 21
Views: 3119

Re: Buying a ticket to an unknown destination and airline sends you where they want.

The original Frontier did this back in the day. Some friends were sent to Fargo, North Dakota I think they said. Actually had a great time, so not the punchline it might seem.

Jump to post
by dakota123
Wed May 01, 2019 1:16 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

The Boeing 737 Max crashes show that 'deteriorating pilot skills' may push airlines to favor Airbus Article I think this is just blowing the issue well out of proportion. The article mentions that Airbus sales rep's are using this argument to pust the A320. 'Airbus told me the reason that their fli...

Jump to post
by dakota123
Wed May 01, 2019 12:31 am
Forum: Civil Aviation
Topic: Boeing 737MAX Grounded Worldwide Q2 2019
Replies: 3768
Views: 385445

Re: Boeing 737MAX Grounded Worldwide Q2 2019

lol! Funny story actually. And remember what he said yesterday. "The max was designed and certified in the same way as we have always designed and certified planes." Gesendet von meinem SM-G950F mit Tapatalk I don't believe that. All airline companies have screwed up at times but this was...

Jump to post
by dakota123
Tue Apr 30, 2019 4:03 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I understand the point of no retraction when you're slowing down, but this is about acceleration at almost full thrust, and overspeed could be an equal and bigger concern. Actually, they got into that - although not without many other events. Procedures are generally written as a one size fits all....

Jump to post
by dakota123
Mon Apr 29, 2019 10:02 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Are you serious ? The lives of others is not a video game where you are allowed to fail. Out of 7 pilots, 6 was not able to cope with that evil machine (JT-43 was saved by an extra crew). From decision to not add emergency slides to allow a extra clearance under the wings, the non ideal placement o...

Jump to post
by dakota123
Thu Apr 25, 2019 1:55 am
Forum: Technical/Operations
Topic: Curiosity about pre delivery vertical stabilizer
Replies: 16
Views: 2894

Re: Curiosity about pre delivery vertical stabilizer

If they repaint it while mounted, they probably remove it after and rebalance it. No. At least we don't after a paint visit. Why don't they have to remove the rudder for repainting then? Doc, the SRM (structural repair manual) provides procedures for balancing the rudder while on the aircraft. I su...

Jump to post
by dakota123
Tue Apr 23, 2019 3:52 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

It does seem like people are mentally twisting to avoid having the word "stall" associated with MCAS, despite it being right there in the very regulations MCAS was created to address! MCAS does not prevent a stall any more than a stick shaker does. The idea behind MCAS is to have consiste...

Jump to post
by dakota123
Tue Apr 23, 2019 2:36 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I don't think anyone is disputing that MCAS isn't a totally screwed up design. That's secondary to me The main point is with a better designed plane MCAS wouldn't have been needed to start with We've got a badly designed plane to start with (that's the worst part). A plane that needs a software pat...

Jump to post
by dakota123
Tue Apr 23, 2019 1:32 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

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...

Jump to post
by dakota123
Tue Apr 23, 2019 3:37 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

This is all great, but we're talking about something black and white, no went just a bit over, officer!" You're showing advisory circular interpreting requirements set forth in CFR. Now you're saying that it ALMOST meets those requirements. We don't have the data, but it is reasonable - but ju...

Jump to post
by dakota123
Mon Apr 22, 2019 11:38 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Nope. 737MAX without MCAS is legally not stable. I am not using word "unstable", I am saying it is not stable. It is very important to understand the nuance in the above sentence as well. Definition of stability according to the law of United States: 14CFR25.171 General. The airplane must...

Jump to post
by dakota123
Mon Apr 22, 2019 10:14 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

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 ...

Jump to post
by dakota123
Sun Apr 21, 2019 2:37 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

That implies the crew did something wrong. ("Because the other crew managed to save plane in the same situation"). Not arrogant, factual. The ET crew did do something wrong. They did not follow the procedure outlined in the EAD. They moved the trim switches to cutout before they balanced ...

Jump to post
by dakota123
Sun Apr 14, 2019 6:43 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 718463

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Making use of electric trim is only mentioned in the final paragraph: Initially, higher control forces may be needed to overcome any stabilizer nose down trim already applied. Electric stabilizer trim can be used to neutralize control column pitch forces before moving the STAB TRIM CUTOUT switches ...

Jump to post
by dakota123
Wed Apr 10, 2019 3:49 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

You know for a fact that lift from the nacelle is ever increasing and would, controls held steady, push the plane into a stall? Or, maybe the lift it generates stabilizes at some low value and doesn’t actually contribute enough lift to get to a stall, all else being equal? The, ahem, authoritative ...

Jump to post
by dakota123
Wed Apr 10, 2019 3:36 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

What's the difference if it was controlled with FBW or by MCAS changing the trim? MCAS, in its designed role, accomplishes essentially the same thing that a FBW system would. A well designed FBW system (or a mechanical system for that matter) on a well designed aircraft would never require or use t...

Jump to post
by dakota123
Wed Apr 10, 2019 1:25 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Sounds like a fairly rational analysis to me. A nice breath of fresh air compared to some of the hysterical claptrap being posted in here. Thanks, Morrisond. Apart from the bits that are just wrong: If you hold the controls steady the Nacelles will not generate enough lift to pull it into a stall I...

Jump to post
by dakota123
Tue Apr 09, 2019 3:12 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14310

Re: MAX nacelle, AOA, center of lift, and C/G

Why would FBW have prevented this? Bad MCAS logic is bad MCAS logic. I get a more modern system could deconflict inputs better in theory... but FBW in and of itself might not be a guarantee. There will never be anything like MCAS on a FBW plane. On a FBW plane the pilot commands a roll rate and a p...

Jump to post
by dakota123
Mon Apr 08, 2019 5:52 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 718463

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

There is no feedback on an Airbus, so I doubt it being a hard regulatory point and rather related to the Boeing design. But could you overwhelm the trim system in a similar way? ( IMU Airbus slow trims the tailplane to meet the average of the elevator position? ) Even if the tailplane is balanced f...

Jump to post
by dakota123
Mon Apr 08, 2019 5:49 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 718463

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Perhaps there should also be a review of the amount of back pressure the column is able to produce, as part of the forces are produced by the system, being not really an indication of the forces on the elevator. That force comes from certification requirements though correct? 1lb for every 6 knots ...

Jump to post
by dakota123
Sat Apr 06, 2019 4:00 pm
Forum: Technical/Operations
Topic: MAX nacelle, AOA, center of lift, and C/G
Replies: 193
Views: 14310

Re: MAX nacelle, AOA, center of lift, and C/G

The flaps were never fully retracted... command to zero degrees recorded, but flaps retracted to 0.019 degrees and never reached zero. So much for MCAS being activated only after flaps reach zero degrees, unless "about zero" means "zero". Position resolvers (one per side plus sk...

Jump to post
by dakota123
Tue Apr 02, 2019 6:02 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I'm pretty sure you are mixing up the originally proposed functionality as detailed in the original certification documents, with the changed, post flight-test, functionality. It seems to have always been specified to operate for ~10 secs per iteration so your numbers make no sense as that would on...

Jump to post
by dakota123
Tue Apr 02, 2019 2:44 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Nope. Maximum of 0.6 degrees nose-down trim. Rate of 0.27 degrees/second. Reference: http://www.b737.org.uk/mcas.htm and everywhere else one cares to look. I'm pretty sure you are mixing up the originally proposed functionality as detailed in the original certification documents, with the changed, ...

Jump to post
by dakota123
Tue Apr 02, 2019 1:40 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

If I understand correctly, MCAS was initially designed to correct the AoA by - 10 degrees . They now came to the conclusion that -5 degrees is sufficient. How can that be? Did they make additional test flights to come to this conclusion? Or is it rather a theoretical analysis? -5° resp -10° Is this...

Jump to post
by dakota123
Sat Mar 30, 2019 5:14 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 718463

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Seriously - specific training? This is part of basic training on any aircraft and I'm sure Pilots do this in the simulator all the time. Drop the nose or apply power and pick up the wing that drops with the rudder (if it drops). If a pilot can't do this they would never be allowed to Solo a Cessna....

Jump to post
by dakota123
Fri Mar 29, 2019 8:08 pm
Forum: Technical/Operations
Topic: Clean sheet designs versus major upgrades of existing designs
Replies: 10
Views: 1585

Re: Clean sheet designs versus major upgrades of existing designs

Didn’t I read somewhere that tucking the engine up that tightly (necessary to get the maximum possible clearance of course) resulted in a drag reduction? Or am i misremembering? ... In cruise flight attitude . ( i.e. lowish AoA ). MCAS is there for HIGH AoA and the engine nacelles sticking out abov...

Jump to post
by dakota123
Fri Mar 29, 2019 4:24 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Definitely true with several of the Boeing contracts readily found. This one is pretty devoid of references to side agreements.

Jump to post
by dakota123
Fri Mar 29, 2019 12:24 am
Forum: Technical/Operations
Topic: Clean sheet designs versus major upgrades of existing designs
Replies: 10
Views: 1585

Re: Clean sheet designs versus major upgrades of existing designs

The exact MCAS fiasco would not have happened on a clean sheet airliner because the engines wouldn't have been placed that far forward. A clean sheet design can definitely have issues, but since aerodynamics are a primary driver one would assume the flight controls are proper from the start. Didn’t...

Jump to post
by dakota123
Thu Mar 28, 2019 7:13 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Not on the max simulators sold to customers. Could have clued in pilots about the information that MCAS existed. I’m refering to the sim operator failing an AOA (and whatever else was/may have been failed in these cases) and then running trim manually as MCAS would to simulate inappropriate MCAS ac...

Jump to post
by dakota123
Thu Mar 28, 2019 6:47 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

In the absence of a full MAX simulator, what you need is for the guy in the other seat to quietly (and without warning) trim nose down using the thumb switches, whilst innocently looking at the scenery out of the window. See how long it takes you to notice and counter-act his action. Remember, he i...

Jump to post
by dakota123
Thu Mar 28, 2019 5:49 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

If I get a chance to get back into a Level D sim in the next few weeks I'm going to make a video of a level flight at 2000ft, then manually trim to full nose down, then flick those switches, then manually crank and see if altitude is still on my side. In the absence of a full MAX simulator, what yo...

Jump to post
by dakota123
Thu Mar 28, 2019 4:40 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Are you sure those contractual liability clauses would stand up if there is clear evidence of negligence? Not a lawyer, but from UAL’s 2010 purchase of A350s that would seem to be the case — and it’s blanket, not for various situations. Boeing’s agreements read basically the same, except that I did...

Jump to post
by dakota123
Thu Mar 28, 2019 5:54 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Apologies; should be BUYER HEREBY... not SELLER HEREBY... That word was missing from my cut/paste, and I mis-typed. It’s late and I’ve been looking at similar docs all evening actually. But right, Airbus (in this case) must fix the warranted part or design defect at its cost during the warranty peri...

Jump to post
by dakota123
Thu Mar 28, 2019 5:19 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

You can be sure plane comes with expressly spelled out liability for various situations when thing don't work as they should. Are you sure those contractual liability clauses would stand up if there is clear evidence of negligence? Not a lawyer, but from UAL’s 2010 purchase of A350s that would seem...

Jump to post
by dakota123
Wed Mar 27, 2019 2:17 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I guess that Boeing's liability to airlines is not limited to just the finance costs of the hardware. Are they not liable to compensate airlines for personnel sitting around doing nothing? Correct me if wrong, but I imagine cabin crew trained for the MAX cannot switch to another type unless they ha...

Jump to post
by dakota123
Sun Mar 24, 2019 8:17 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

More or less a distraction what you write. This is about integrating a completely safe engine on an up to now rather save airframe resulting in a product that has an unpleasant tendency to crash. superficially about 20..40 times more often than for the predecessors. Acceptable: MCAS related crashes...

Jump to post
by dakota123
Sun Mar 24, 2019 8:10 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Bullsh*t. No more a kludge than Mach trim or rudder limiters. I suggest you go try and understand the FARs (in this case, specifically 25.103 and 25.203 - and might as well look at 25.672 while you are at it) to see why one is a kludge and the others are accepted means of improving control and/or s...

Jump to post
by dakota123
Sun Mar 24, 2019 7:07 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5474
Views: 718463

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

There are plenty of reasons to demonize MCAS and Boeing - why do you keep bringing up AA and the Airbus order? Do really think Boeing knew they’d need the MCAS system at that time? Boeing knew that reengining would be more challenging, more expensive, and possibly less effective than the Airbus due...

Jump to post
by dakota123
Sun Mar 24, 2019 6:52 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Larger fan blades, gearboxes, hotter cores, 60:1 pressure ratios, LP cores spinning at twice the rpm of previous designs — THOSE are some of the things that we think we understand but maybe don’t fully just yet. More or less a distraction what you write. This is about integrating a completely safe ...

Jump to post
by dakota123
Sun Mar 24, 2019 5:55 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I think there are two issues here Number one ) obviously all concerned in the short term at least work their hardest to make the plane as it is as safe as it can be despite using MCAS Number two) separate to that the world decides whether or not it's acceptable to launch a plane that is by its very...

Jump to post
by dakota123
Sun Mar 24, 2019 5:43 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Does the existing 737 (before max) need MCAS to fly safely? Are we happy with the safety of that plane? I'm assuming the answer is no followed by yes If my assumption is correct I simply have no idea why this is even up for debate? They've fudged something that adds extra risk. Worse still Boeing h...

Jump to post
by dakota123
Sun Mar 24, 2019 5:11 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

Does the existing 737 (before max) need MCAS to fly safely? Are we happy with the safety of that plane? I'm assuming the answer is no followed by yes If my assumption is correct I simply have no idea why this is even up for debate? They've fudged something that adds extra risk. Worse still Boeing h...

Jump to post
by dakota123
Sun Mar 24, 2019 5:05 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

I still don't get why ANYBODY would accept workarounds to reduce risks that don't need to be risks in the first place on a better designed plane? What am I missing here? MACS was hidden by Boeing? Why would we now accept MACS as being a risk we would ever want to have to risk failing on a plane aga...

Jump to post
by dakota123
Sun Mar 24, 2019 2:38 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6472
Views: 716216

Re: B737MAX Grounded Worldwide

(...) Res the plane, it appears the MAX as is, is almost a good safe plane. It does not need to be re-certified "from the ground up". The MCAS was done poorly. In particular the plane under certain circumstances (failed AofA) could do things that apparently set off several alarm systems -...

Jump to post