Search found 292 matches

by xmp125a
Fri Apr 19, 2019 6:22 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

It's clear how many people posting have never held a real engineering position. An engineers job is not to make the best performing product ever. It's to produce a product that meets the design goals while minimizing cost. Did you expect Boeing to get to flight testing of the MAX, notice a non-line...

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by xmp125a
Fri Apr 19, 2019 5:36 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Well if the plane flies again it's a disaster waiting to happen one way or another. With or without the sim training IMO. I agree that generally speaking it is a compromised design that is worse than the previous one. However practically speaking it maybe considered "safe enough". Frankly...

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by xmp125a
Fri Apr 19, 2019 5:20 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

It's apparently impossible to discuss cultural differences, even in company cultures without being classified as racist nowadays? Discussing cultural differences is fine, unless overgeneralizing. For example. just because Ethiopian Airlines is from Africa, it does not mean that its pilots are idiot...

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by xmp125a
Fri Apr 19, 2019 2:35 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

The stall prevention feature of MCAS is not needed if pilots have some sim time, to train on this "stall afinity" in very small part of the flight envelope where MAX's new engines cause different aerodynamic handling that NG. The other reason for MCAS, the feeling of the column, could be ...

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by xmp125a
Fri Apr 19, 2019 12:43 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

I think one should keep in mind there is really nothing wrong with the Max other than an incredibly botched add on auxiliary control system. No reason EASA shouldn't re-certify once it is fixed. No! Post-mortem examination of such failed system does not stop with "we had it at pitch authority ...

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by xmp125a
Fri Apr 19, 2019 12:32 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

The stall prevention feature of MCAS is not needed if pilots have some sim time, to train on this "stall afinity" in very small part of the flight envelope where MAX's new engines cause different aerodynamic handling that NG. The other reason for MCAS, the feeling of the column, could be ...

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by xmp125a
Fri Apr 19, 2019 12:23 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

I still can't believe Boeing are still building the MAX at a rate of over 42 a month, with no clue as to how they can get the certificate back. . this is high politics now and @ trump times the investors @ boing can be shure the birds will fly soon and they will fly worldwide soon thrust me if EASA...

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by xmp125a
Fri Apr 19, 2019 1:00 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Planecane gets it. Bravo. The NG has 5 failures that could cause uncommanded stab movement. I wasn't trained on each individual one -I didn't need to be. The corrective action to all 5 was the same. The MAX has 6 and the same logic applies. But that implies simulator training. Because failure modes...

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by xmp125a
Thu Apr 18, 2019 7:28 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Its almost a lose lose situation for Boeing. I seriously think this runs deeper than some of us are saying. Boeing is at fault, no matter how this plays out, Boeing is credible for the loss of life, the financial damage to airlines and suppliers/businesses and all direct issues the crashes and the ...

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by xmp125a
Thu Apr 18, 2019 7:20 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

According to a Canadian Press article being carried on CTVnews.ca, Canadian Transport Minister Marc Garneau says any airline operating MAX8 into Canadian airspace will be required to include simulator training. If true, this confirms earlier WSJ reporting of a possible break with the FAA, and possi...

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by xmp125a
Thu Apr 18, 2019 7:18 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

As it relates to training, I thought the general A.Net consensus was that WN and the US carriers were the one's that Boeing would have to pay if the MAX required SIM time, if that is the case, there is nothing preventing other countries from implementing whatever training methods they want. We alre...

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by xmp125a
Thu Apr 18, 2019 7:12 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

How do you reccomend airlines like AA and WN train their pilots in a MAX sim - when they haven't been able to purchase one? Their and Boeing's problem, not everyone else's. They both gambled and they both lost. Fortunately for WN it did not cost any of THEIR passenger lives. They should be happy, n...

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by xmp125a
Thu Apr 18, 2019 7:10 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Anybody here pushing the FAA and Boeing's view are pushing for flying passengers on the MAX having only flown the NG. Zero time on the MAX, zero time on a MAX simulator. So if an airline does not operate 737's now and they purchase a MAX what training do they get, let's not ignore that as well, eve...

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by xmp125a
Thu Apr 18, 2019 8:23 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Sorry - I knew I should have said Ethiopian Airlines - vs Ethiopians but I assumed everyone would know I was referring to the Airline and not the people in general. I have also been pretty adamant that this is a worldwide issue as well - training seems to be deficient at many airlines worldwide. I ...

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by xmp125a
Wed Apr 17, 2019 3:09 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Duplicate. Cannot delete.

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by xmp125a
Wed Apr 17, 2019 3:08 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

A software fix that adds AoA disagree warnings, might consider the airspeed and uses both sensors in addition to the changed activation logic always seemed enough. The rest was hysteria. If MCAS auto deactivates in case of an AoA disagree situation, you do not even need an extra switch to turn it o...

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by xmp125a
Wed Apr 17, 2019 11:36 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

A software fix that adds AoA disagree warnings, might consider the airspeed and uses both sensors in addition to the changed activation logic always seemed enough. The rest was hysteria. If MCAS auto deactivates in case of an AoA disagree situation, you do not even need an extra switch to turn it o...

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by xmp125a
Wed Apr 17, 2019 11:26 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

It seems like the Video Pilot got his information from this article https://aviationweek.com/commercial-aviation/pilots-say-max-mcas-software-updates-prove-effective-simulator-demo Lots of good info - the part about the US pilots never being trained on AOA failures a little scary but not surprising...

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by xmp125a
Wed Apr 17, 2019 11:24 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

sassiciai wrote:
Boeing's original plan to have a fix in 3 weeks is unfortunately so revealing as to which development path it had chosen.


YES! It is not coding problem, it is system design problem, and a big one if resulted in the mess that is MCAS.

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by xmp125a
Wed Apr 17, 2019 9:16 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Please do not see valid questions as to why they did not perform some mandatory procedures as blame. It is an open question to the masses to try and understand the pilots mindset, we know what they should have done, but we do not understand why they did what they did. Exactly. It may turn out that ...

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by xmp125a
Wed Apr 17, 2019 7:02 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Neither Ethiopian nor LionAir were not close in stall conditions and yet MCAS activated; This is getting a little weird -- like two ships passing in thick fog. Some posters keep insisting that MCAS is an anti-stall system. Others simultaneously are waving their arms wondering where in the "ave...

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by xmp125a
Tue Apr 16, 2019 6:07 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Could MCAS not have AGL and terrain added to its criteria? so it does not kick in at all, if so near the ground that pointing the nose down defeats any form of stall protection. There’s little point in MCAS ‘saving’ a plane from a stall, when it’s heading into the ground or terrain. Stall is extrem...

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by xmp125a
Tue Apr 16, 2019 5:35 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

You make it sound like MCAS is completely redundant. You understand that that it simply impossible? MCAS is redundant from a safety point of view. They only added it to ensure common handling characteristics between the NG and the MAX so that airlines don't have to pay for simulator time to certify...

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by xmp125a
Tue Apr 16, 2019 4:12 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Agreed, how MCAS was designed and deployed is shockingly terrible. I still cant fathom why they thought to only use 1 AOA input at a time. Second, why the system didnt have a limit on how much it could trim. If the plane is so nose high it requires MCAS to trim it to the max. The pilots arent doing...

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by xmp125a
Tue Apr 16, 2019 6:20 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

It appears that you don't understand that it wasn't a "requirement" for no sim time - but a reality. No MAX sims existed when the first MAX's were delivered. The exact same thing was true when the NG's first rolled out - it is not uncommon. When the NG's first showed up at WN, we were req...

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by xmp125a
Mon Apr 15, 2019 6:50 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Question for those more knowledgeable, are there any other mainstream planes that need a computer to maintain flight stability or is it just the MAX? Because my understanding this plane needs it because of the positioning of the Engines makes it unstable during climb? My worry here is that the plan...

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by xmp125a
Mon Apr 15, 2019 5:54 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Also better pilot training in the SIM and more hands on flying will improve pilot skills so they can correctly respond to problem situations. This rings of truth to me. What does everyone else think? Perhaps this has to be said again and again: the main objective in development of 737MAX was that n...

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by xmp125a
Mon Apr 15, 2019 5:42 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

I'm assuuming this is the reason that the software change involves more than just response to sensor values. By limiting the total authority to 2.5 degrees per event and only activating once per event, it mitigates the issue of simultaneous AoA sensor failures because the worst case would be recove...

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by xmp125a
Mon Apr 15, 2019 5:35 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Does a twin engine aircraft have a greater chance of an engine failure than a single engine aircraft? Yes, it does. But would you rather be aboard a twin engine aircraft that has an engine failure or would you rather be on a single engine aircraft with an engine failure? Big difference there. When ...

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by xmp125a
Mon Apr 15, 2019 2:03 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

We will see if this changes anything, because it would need a complete reversal of the FAA´s company culture, that sees EASA or CAA as lesser entities that are only trying to help the manufacturers in their countries. And Boeing will be adding fuel to the fire already. It really is simple. If FAA g...

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by xmp125a
Mon Apr 15, 2019 9:31 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Yes, I appreciate the procedure and the argument, but is does not resolve the coincidence for me. 'The pilot was not not aware enough to hold the trim switch long enough but was to stop at 2.3 in each case'? As a mind game, with regard to the last two attempts, if I pressed the thum switch and the ...

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by xmp125a
Mon Apr 15, 2019 9:17 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

(Which is actually the good news for Boeing and the travelers, as one can be sure that if the board decides that ban should be lifted, it will be based on others, not only FAA) We will see if this changes anything, because it would need a complete reversal of the FAA´s company culture, that sees EA...

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by xmp125a
Sun Apr 14, 2019 7:34 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

According to ATW FAA targets late May, early June re authorization for the 737MAX. http://m.atwonline.com/regulation/faa-targets-late-may-early-june-max-airworthiness-approval Are the CAA or EASA likely to take the FAA at their word, or will Boeing need to do full applications in each country/regio...

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by xmp125a
Sun Apr 14, 2019 5:59 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Ok. then it makes sense. So the idea of using electric trim input was good. Now they were back in the STAB TRIM RUNAWAY procedure at the point where you trim the aircraft before STAB TRIM CUTOUT. Why did they leave the switches on? It caused the final AND motion by MCAS.... They did not leave them ...

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by xmp125a
Sun Apr 14, 2019 5:56 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

When triggered, MCAS will operate for a 10 second cycle which will be aborted if in any of the following conditions are met - AOA value falls below the trigger value or trim switch is operated or 10 seconds have elapsed. A 5 second pause will then made. If the trigger conditions are met, MCAS will ...

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by xmp125a
Sun Apr 14, 2019 5:08 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I wonder, who will sell more planes across the Asia and the rest of the 3rd world in the coming years with that attitude? Boeing or Airbus? Where did I say third world and yes I’m sure Boeing intentionally designed MCAS the way they did on purpose... they really wanted to Kill some people as that i...

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by xmp125a
Sun Apr 14, 2019 5:03 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I don't understand something. What if "death kiss of MCAS" comes again in that interval? At low altitude, it could be fatal. So I assume the pilots would flick the switches as soon as it becomes obvious MCAS is the source of problems. I would expect some sane person reading the Advisory w...

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by xmp125a
Sun Apr 14, 2019 5:01 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I’m guilty as charged (only joined recently and only posting here after having read on a.net sporadically for years). I don’t have an agenda other than hoping commercial air travel is held to the highest safety standards and safety continues to improve. I spent considerable time as PAX on commercia...

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by xmp125a
Sun Apr 14, 2019 3:32 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

It seems to me as though the last number of major accidents could have turned out better if better training existed. All the people bashing on Boeing conveniently forget that Airbus is establishing schools worldwide as they think Training Standards aren't what they should be. So, given the state of...

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by xmp125a
Sun Apr 14, 2019 3:22 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The ET crew should have been able to recover after the EAD was issued and they were trained on the modified section of the FCOM. They started doing the procedure but cut off electric trim before balancing the control forces for some unknown reason. The trim was changing and they would have been abl...

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by xmp125a
Sun Apr 14, 2019 3:13 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

What has not been answered: With full stick back / full elevator travel : does the electric trim still work effectively ( in the right direction reducing tailplane incidence.) That had been answered by the FDR chart in the preliminary report. Before they hit the cutout switches, there was nose up i...

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by xmp125a
Sun Apr 14, 2019 3:04 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Wow, the cautious side did not last long and the campaign against the crew back in full force. I guess that Boeing boys will painfully discover that the various regulators will not be fooled so easily. The regulators are requiring the software update so the situation can't happen again. Regardless,...

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by xmp125a
Sun Apr 14, 2019 3:00 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I’m hoping for the former bc after the JT crash every Max driver should have been proactive in understanding the MCAS system, failure modes and proper responses. I hope that sim time is made mandatory for any transition from NG to MAX despite the opposition of Boeing, SW, etc. Will solve almost all...

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by xmp125a
Sat Apr 13, 2019 7:07 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: Southwest pilots question all-Boeing fleet

Boeing simply can't afford to close down the MAX line without a replacement in place. They have to fix it, regardless of cost. Guys, let's not forget that all "unsolvable" problems with MAX are due to "red line" requirement that no sim time is needed to transfer from NG to MAX. ...

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by xmp125a
Sat Apr 13, 2019 6:58 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

I hope that however the fix is done, that the testing will be very through, even if delays the return to service of the 737MAX series planes for more months including into the Fall. Also, there is the need to make sure any fix is not going to create other issues. I am concerned that the FAA will be...

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by xmp125a
Sat Apr 13, 2019 9:58 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

OK, so we agree that the failure rate of (at least 1 of) 2 sensors is double the failure rate of a single sensor. I think the point that mjoelnir was making was that it was worse to cycle between the 2 AOA sensors. It would have been better off not cycling between the 2 AOA sensors and always using...

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by xmp125a
Sat Apr 13, 2019 9:51 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 753810

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Maybe a crazy idea, but would it be possible to rotate (roll) the plane such that it was flying upside down, which would allow it to gain altitude rather than dive? It probably would not have been able to save this plane, at least when it was in its final dive at low altitude, but wouldn't it inver...

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by xmp125a
Sat Apr 13, 2019 9:45 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

≠ p(one sensor failing) * n(sensors) = 0.2 x 2 = 0.40 True but you are comparing "at least one of" to "any one of". Not the same.[/quote] Please understand that it is significantly different if you can assume the failed sensor is serviced after the flight on which it is not used...

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by xmp125a
Sat Apr 13, 2019 9:42 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

Well, if it comes to that... how about hiring real engineers? And hiring even more to do real failure tree analysis? You know, paying engineers instead of using money for campaign contributions? Humans are expected to make mistakes. And that has to be taken into account. If precise pilot action is ...

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by xmp125a
Sat Apr 13, 2019 9:34 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 757859

Re: B737MAX Grounded Worldwide

The probability of at least 1 of 2 sensors failing is... indeed approximately double the probability of 1 sensor failing. As I posted previously we have an estimate of sensor MTBF 20000hrs. This equates to a failure rate of 5E-5 per hour. Both sensors have the same predicted failure rate, so if you...

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