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by dragon6172
Sat Apr 06, 2019 5:02 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

What do you see in the report that makes you think that? I dont see it. I coulda missed it. Do you agree thats plausable? Ive never heard of the trim wheel not working. Though it isnt used much. When they captain asks if the trim is working and the the FO replies "no, should i try manual trim&...

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by dragon6172
Sat Apr 06, 2019 4:42 pm
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 793197

Re: B737MAX Grounded Worldwide

Here is the leading edge of an Embraer ERJ-170 horizontal stabiliser, beautifully marked out in degrees, and showing the normal bias towards a range of nose up positions. On this ERJ-170 there appears to be just 2deg of down trim at maximum deflection; the 737 MAX features 5deg down trim. A simplet...

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by dragon6172
Sat Apr 06, 2019 3:52 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I suspect that the additional problem Boeing are investigating will be related to the lack of response from the trim system to the pilots electric trim command at 5:40:15, when the aircraft was still considerably below Vmo. Compare the pitch trim response to the response seen to a slightly shorter ...

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by dragon6172
Sat Apr 06, 2019 2:16 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

If for some reason the pilots maintained pressure on the thumb switch and yet MCAS still activated, then maybe this is the hidden problem Boeing are now trying to solve. :scratchchin: I suspect that the additional problem Boeing are investigating will be related to the lack of response from the tri...

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by dragon6172
Sat Apr 06, 2019 2:01 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

This is probably my fault for not spelling out my main point clearly enough. The "something else" was autopilot randomly disengaging. If flaps retraction had been the only action in this 15 second window, MCAS would not have activated at 05:40:00 The autopilot disengaging is likely to be ...

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by dragon6172
Sat Apr 06, 2019 11:45 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Captain Hindsight with a possible answer here; 1. Re-engage stab trim cut-out 2. Immediately (or even sooner than that!) use thumb switches, and continue to depress the thumb switch to prevent MCAS function .(*) 3. Now, in conjunction with the electric motor attempting to move the stabiliser, both ...

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by dragon6172
Sat Apr 06, 2019 11:42 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The note in the AD to FIRST get a level flight and THEN cutout the electric trim is completely ridiculous because if they could manage to have a level flight they do not need to cutout ... problem is already solved its like: DIRECTIVE: in emergency use the hand break to reduce speed of the car NOTE...

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by dragon6172
Fri Apr 05, 2019 10:12 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

By the time any of the overspeed clackers were going off, they were already in such deep shit, that the condition was proabbly irreversible . By deep shit you mean a 2000 fpm climb and no MCAS inputs for 2.5 minutes? 05:41:20 - Overspeed clacker (RH) was recorded on CVR (page 11 of report) 05:41:32...

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by dragon6172
Fri Apr 05, 2019 9:40 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Damn - you beat me to it! :lol: (strictly speaking it's a stall warning as opposed to underspeed per se ) Are you as frustrated as me with all these answers that make it all seem so easy......? Excuse me, wasnt precisely the stick shaker active because the Captain side's AoA had a 76° pitch up nose...

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by dragon6172
Fri Apr 05, 2019 9:09 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

2. There are two speed traces on the graph. Only one exceeds the guideline Vmo. Why would you select one version over another (except to promote a certain agenda)? Agenda? Sheesh. No agenda, just reading the data provided from the FDR. The RH speed trace exceeds Vmo. I chose it because the RH side ...

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by dragon6172
Fri Apr 05, 2019 5:59 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

They were at least 25-30 knots over Vmo 2. There are two speed traces on the graph. Only one exceeds the guideline Vmo. Why would you select one version over another (except to promote a certain agenda)? Agenda? Sheesh. No agenda, just reading the data provided from the FDR. The RH speed trace exce...

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by dragon6172
Fri Apr 05, 2019 9:44 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

To everyone who is saying that the pilots should have reduced throttle based on the unreliable airspeed procedures: theynwere physically unable to follow that procedure. The 75 % throttle is only half of it. The other half is to trim 4 degrees nose up. As they were unable to trim nose up, they were...

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by dragon6172
Fri Apr 05, 2019 1:47 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 793197

Re: B737MAX Grounded Worldwide

There are no pilot actions or procedures during flight which require knowledge of angle of attack. So, yeah, we did all we were required to do, and we weren't required to provide a visual clue that the AoA sensors were providing grossly different values even while the aircraft was taxiing. AoA indi...

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by dragon6172
Fri Apr 05, 2019 1:12 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Although I have not seen it explicitly stated I am wondering if the first Lion air flight with the problem had the benefit of height before the problem occured making it substantially easier to find the fix in time with the additional crew member. Height? They were around 1500 feet when they got th...

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by dragon6172
Fri Apr 05, 2019 1:03 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

So the question that I have is why were the crew of the previous Lion Air fight (the flight before JT610) were able to save the plane while the Ethiopian flight didn't? To me, both flights seem they were in similar conditions as both flight crews managed to turn off the stab trim switches according...

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by dragon6172
Fri Apr 05, 2019 12:58 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

It would have to be the following: Re engage STAB TRIM CUTOFF switches. Electric trim to desire level. CUT OFF SWITCHES before 5 seconds pass (or MCAS will nose down again IF AoA sensor is still at fault). Unfortunately it appears they were unable to "Electric trim to desire level" and so...

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by dragon6172
Thu Apr 04, 2019 11:55 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

They probably weren't familiar with the uber-high forces needed to move the trim wheel in such a condition. Certainly they weren't expecting it since Boeing wasn't even expecting it. Also, reducing airspeed without pitch effectiveness isn't trivial. If you slow down the airplane will pitch down (th...

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by dragon6172
Thu Apr 04, 2019 11:08 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

KingOrGod wrote:
morrisond wrote:

But it wasn't within its flight envelope.


In what way?

They were at least 25-30 knots over Vmo

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by dragon6172
Thu Apr 04, 2019 11:00 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

XRAYretired wrote:

MCAS active can only be inferred by autrotrim down (FLAPS UP, AP OFF). This ship did not have AOA angle indicator, so a trim can only be set by feel and other visual references.

Ray

Trim can be set using the trim indicator or the attitude indicator combined with control forces feel.

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by dragon6172
Thu Apr 04, 2019 10:30 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Apparently STAB TRIM CUTOUT switch positions are not recorded by the DFDR, and so they cannot directly identify the position of the switches. Not recorded, because MCAS, as well as the pilots, can change. Likely MCAS will turn out to have three settings - OFF (procedure yet to be disclosed by Boein...

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by dragon6172
Thu Apr 04, 2019 7:29 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

And that's the saddest thing of all right there ... both of these crashes would never have happened had the crew simply re-extended the flaps,and returned for an emergency landing. The ET crew could not have deployed flaps at the kinds of airspeeds they were traveling. As I said in a post up-thread...

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by dragon6172
Tue Apr 02, 2019 2:30 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

There's a fundamental difference between reading a bulletin and amending a NNC. Especially since the bulletin (and FAA's AD, which was published 1 day after the bulletin and copies Boeing's wording verbatim) is phrased rather blandly: "...may be..." and "...can be..." hardly con...

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by dragon6172
Mon Apr 01, 2019 11:04 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

2) The paragraph you quoted is not part of the Runaway Stabilizer Non-Normal Checklist in the FCOM, but only appears as a Note in page 2 of the bulletin issued by Boeing on Nov 6th 2018 (after the Lion Air crash) with this Reason : "To Emphasize the Procedures Provided in the Runaway Stabilize...

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by dragon6172
Mon Apr 01, 2019 8:17 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Statement 5: Trim cut out checklist is flawed The standard response to just hit the stabilizer cutout switches and manually trim is actually flawed. If the nose has been pushed down by significant mistrim (nose down stabilizer, nose up elevator), and as airspeed increases, it may not be possible to...

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by dragon6172
Sun Mar 31, 2019 7:59 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

So, if Boeing does not mandate AoA replacement with a new part (I do not know whether they do or don't), the provisioner of an airline always has multiple choices. Boeing can mandate all they want (I doubt they do for anything), the operator will decide what kind of part (new, overhauled, as remove...

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by dragon6172
Sat Mar 30, 2019 1:25 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

This pitching up when applying power is partly due to the sheer power of the engines, and partly due to their positioning. Particularly in the MAX. In fact, aren't we now coming full circle, back to part of the reason for MCAS in the first place - to mitigate against the natural tendency of a 737 M...

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by dragon6172
Sat Mar 30, 2019 11:40 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

look at the FDR diagram of the lion air crash electric up trim movement commanded by the console only in those timeframes when there is no trim down command from MCAS will you suggest that it is simple coincidence that the crew only tried to trim the nose up when MCAS was not trimming down? they on...

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by dragon6172
Wed Mar 27, 2019 1:54 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Atlas just crashed a 767 due to pilot error, but we could also get hysterical: -How can it be so easy to push TOGA and not know it! -Isnt it a design flaw that TOGA will be quietly waiting to cause an emergency by engaging when you select flaps? -Why would the aircraft allow 45 degrees nose down?! ...

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by dragon6172
Wed Mar 27, 2019 12:46 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Atlas just crashed a 767 due to pilot error, but we could also get hysterical: -How can it be so easy to push TOGA and not know it! -Isnt it a design flaw that TOGA will be quietly waiting to cause an emergency by engaging when you select flaps? -Why would the aircraft allow 45 degrees nose down?! ...

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by dragon6172
Tue Mar 26, 2019 10:39 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The real root problem with MAX that some pilots still don't know how to fly. They fail to monitor the stabilizer angle and fail to know how to manually change it quickly (this is a memory item), Of course it does not help that BOEING blocks the trim button during the 10 sec MCAS activation. Perhaps...

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by dragon6172
Sun Mar 24, 2019 3:47 am
Forum: Civil Aviation
Topic: Atlas Air 3591 Down in Trinity Bay, Texas
Replies: 1923
Views: 465760

Re: Atlas Air 3591 Down in Trinity Bay, Texas

I had assumed both pilots felt the somatogravic illusion so they were both pushing down, but given the ability of the yokes to separate based on the antijam breakiut mechanism, indeed only one needs to. I've thought the linked yokes were a nice feature to allow feedback from one pilot to the other ...

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by dragon6172
Sun Mar 24, 2019 12:47 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 635678

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

I think the crux of the issue is that it is not immediately apparent that the trim is the issue. The airplane automatically trims all the time (from what I understand), so when MCAS is working it’s not the first thing that will come to mind. Perhaps an aural alert any time MCAS is actually sending ...

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by dragon6172
Sat Mar 23, 2019 3:23 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The absence of an AoA display they could trust means they were flying VFR whilst heading towards a low morning sun. Not exactly ideal, although it could have been worse. They still had an attitude indicator available to tell when the pointy end started going towards the ground. You do not need an A...

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by dragon6172
Sat Mar 23, 2019 12:49 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

My guess is we will find out that MCAS wasn’t even the issue on this crash until it was actually kicking in to counteract what this crew had done to get unti this jam. MCAS is a safety feature designed to help prevent pilots from over doing a climb. MCAS activating doesnt mean its the thing malfunc...

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by dragon6172
Tue Mar 19, 2019 9:43 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

My guess would be once until reset. Pilot input to trim or AoA reduction below threshold constitutes a resetting of the system . Somehow that bolded part sounds exactly the same as the existing system which caused the problem in the first place! Reset of the system must surely be achieved in a diff...

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by dragon6172
Tue Mar 19, 2019 8:48 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

rideforever wrote:
MCAS will kick in only once.
Once .... per flight ? Once .... per minute ? Once what once ?!!!.

My guess would be once until reset. Pilot input to trim or AoA reduction below threshold constitutes a resetting of the system.

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by dragon6172
Tue Mar 19, 2019 1:21 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

I was wrong of course, not 30 but 17. The value 240 must also be wrong. Searching more I found a range from 40 to 268. But I defer to 7BOEING7 with around 50, he is the expert. And from low altitude and high speed, one has maybe 30 seconds until fiery death. Better spin that wheel fast! Or you coul...

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by dragon6172
Tue Mar 19, 2019 12:25 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

What I gathered in articles I read, 240 manual turns to go from full nose down to full nose up I.e. 30degrees. So 80 turns from -5 deg to 0 deg. Plan ahead if you are going to spin by hand! You're right. I was reading the wrong thing when I said 30-40 turns earlier. I dont know where you get 30 deg...

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by dragon6172
Mon Mar 18, 2019 10:34 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Anyone any ideas on this question: What angle rate could one normally expect with hand turning the trim wheel? . . . then it's vital to flick Stab Cut Switch immediately. Now the crew have to revert back to manual trim wheel. What's the normal rate your average pilot can obtain using the wheel? Fro...

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by dragon6172
Mon Mar 18, 2019 6:02 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Did anyone else see this info from the Seattle Times article? Alternatively, the system could have been designed to check that the angle-of-attack reading was accurate while the plane was taxiing on the ground before takeoff, when the angle of attack should read zero. “They could have designed a tw...

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by dragon6172
Mon Mar 18, 2019 5:57 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Im trying to understand the basis of “unreliable airspeed”. Was there actual failure of the pitot/static system; failure to display it including on the standby instruments, or just stick shaker moving? Clearly they had sufficient airspeed to get airborne. I have a hunch so much emphasis has been pu...

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by dragon6172
Mon Mar 18, 2019 4:45 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Im trying to understand the basis of “unreliable airspeed”. Was there actual failure of the pitot/static system; failure to display it including on the standby instruments, or just stick shaker moving? Clearly they had sufficient airspeed to get airborne. I have a hunch so much emphasis has been pu...

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by dragon6172
Mon Mar 18, 2019 2:05 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The whole point of it is to manage a near stall condition by altering the control feel for the pilot. If it stopped as soon as he reacted then it wouldn't be able to do that. It will always do the 2.5 or 0.6 degrees no matter what. No... it stops trimming if the pilot trims the opposite direction O...

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by dragon6172
Mon Mar 18, 2019 11:55 am
Forum: Civil Aviation
Topic: B737MAX Grounded Worldwide Q1 2019
Replies: 6476
Views: 793197

Re: B737MAX Grounded Worldwide

Quote: * Economic problem. Boeing sells an option package that includes an extra AoA vane, and an AoA disagree light, which lets pilots know that this problem was happening. Both 737MAXes that crashed were delivered without this option. No 737MAX with this option has ever crashed. So will Boeing al...

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by dragon6172
Mon Mar 18, 2019 11:45 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

You say negative, what I took from that article was, if the MCAS gets erroneous data it the start to trim the aircraft, if it’s got to 1 degree and pilot hits reset. If it’s still getting erroneous data it can then trim a further 2.5 degrees. If he hits reset again and MCAS is still receiving erron...

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by dragon6172
Mon Mar 18, 2019 2:47 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Backseater wrote:
I was under the impression (probably wrongfully so) that piloting with the stab trim in max nose down position would neither be easy nor advisable!

That is correct. But its not what we are talking about.

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by dragon6172
Mon Mar 18, 2019 2:05 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The function is reset but not the stab trim. Everytime the stab trim is increased to push the nose down, isn’t the pilot going to have to increase the AoA to achieve his intended climb rate? In which case, MCAS is likely to exceed its current threshold even earlier than before? I do hope that what ...

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by dragon6172
Mon Mar 18, 2019 1:22 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Fine. But if the condition that triggered MCAS (probably exceeding AoA threshold as a function of Mach nr) disappears due to pilot input but reappears a moment later. Does MCAS starts as if nothing happened before? Yes. No what it says is if it trims 1 degree and the pilot resets it will then enact...

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by dragon6172
Sun Mar 17, 2019 10:14 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

One simple question: Isn’t a detected approach to stall conditions just a transient event? If so, does MCAS ever undo what it just did? I.e. stab trim from o to -2.5 and at some later time back to 0? My guess is that in an actual near stall event it wouldn't move the stab the full 2.5 degrees. It's...

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by dragon6172
Sat Mar 16, 2019 1:13 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 787264

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

But lets say finally, after figuring out the problem, the decision to disconnect is made, and the pilot flips one of the 2 switches described by PW100 at #2593 and dragon6172 at #2596. If it is (mistakenly?) the one that disables electric trim then the pilot's thumbswitch does nothing, and the trim...

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