Search found 163 matches

by fadecfault
Tue Apr 23, 2019 7:30 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Well what is YOUR source? Me. https://i.ibb.co/5LxmbtN/ee.jpg Well, (a) it says "System Differences Volume 1", which could mean the circled item is a difference - it's on the NG and not on the Max, and (b) the presence of a separate SMYD doesn't necessarily mean a straight AOA connection....

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by fadecfault
Mon Apr 22, 2019 9:08 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

sgrow787 wrote:
fadecfault wrote:
No the symds are not intergrated with the fccs. No it does not get aoa from the adiru.

This is what happens when you have bad information.


Well what is YOUR source?


Me.
Image

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by fadecfault
Sun Apr 21, 2019 3:23 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

If you want to blame the adiru you need to explain why the stick shaker was operating. Everyone here who wants to blame the adiru seem to gloss over that very important fact. Simple. As evident in the block diagram on page 17 of the ET302 preliminary report - and the same diagram presented by exper...

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by fadecfault
Sun Apr 21, 2019 2:57 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

A consensus seems to be building that the incorrect AOA signal is the result of an ADIRU problem rather than AOA sensor problem not least because (as I was forcibly advised) AOA high signal, when processed with Pitot tube signal to calculate IAS would result in IAS higher on the affected side than ...

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by fadecfault
Sat Apr 20, 2019 8:35 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

A consensus seems to be building that the incorrect AOA signal is the result of an ADIRU problem rather than AOA sensor problem not least because (as I was forcibly advised) AOA high signal, when processed with Pitot tube signal to calculate IAS would result in IAS higher on the affected side than ...

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by fadecfault
Thu Apr 18, 2019 10:04 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

How does mcas increase stick force? Stab position is an input to the elevator feel computer, by MCAS driving a change in stab, via the elevator feel computer stick forces change. By override cutoff switches on the column, are you referring to the electric trim switches? I think they are referring t...

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by fadecfault
Wed Apr 17, 2019 8:37 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

How does mcas increase stick force? When MCAS is activated, the stabilizer is driven nose up and the airplane pitches nose down. The airplane nose down pitch means the pilot pulls harder on the stick so the airplane continues pitching up to stall. There is an actual hydraulic feel system on newer N...

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by fadecfault
Wed Apr 17, 2019 6:39 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

The problem was that the MAX Flaps Up stall characteristics, while stable, could not be certified due to "stick lightening". Some thing had to be done, so MCAS was born. Problem is, at this point we should take the official reasoning behind MCAS with a grain of salt, as it seems to have t...

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by fadecfault
Tue Apr 16, 2019 4:52 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Two points that infer a ADIRU issue, and not a sensor issue: (1) Both the Lion Air and Ethiopian crash reported right-side airspeed greater than left side. However both crashes also reported left-side AOA angle higher than right side. This is inconsistent with a faulty AOA, which would cause a comp...

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by fadecfault
Tue Apr 16, 2019 12:05 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Two points that infer a ADIRU issue, and not a sensor issue: (1) Both the Lion Air and Ethiopian crash reported right-side airspeed greater than left side. However both crashes also reported left-side AOA angle higher than right side. This is inconsistent with a faulty AOA, which would cause a comp...

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by fadecfault
Mon Apr 15, 2019 6:17 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Link: https://www.quora.com/Why-doesn-t-Boeing-fix-the-MCAS-software-immediately Simon Gunson Oh no, it's that guy who accused me in public of being a "disinformant on the payroll of Boeing"... LOL... (No, I did not mean MRMR12) I think it's obvious to one with 737 technical experience th...

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by fadecfault
Wed Apr 10, 2019 6:24 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Those of you arguing over the switch wiring need to know that diagram does not fully represent the actual system. The actual WDM needs to be seen to make any kind of factual statement.

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by fadecfault
Mon Apr 01, 2019 8:37 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Are the maintenance records for that aircraft good enough to be released: - serial numbers of the AoA sensors installed? (by the way, did they find them in the debris? They should have!) - history records of the AoA sensors (source, repairs, ...) - detailed records of the installation and test proc...

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by fadecfault
Mon Apr 01, 2019 6:09 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

Incorrect. There are 2 channels on the aoa. One feeds the symd and the other feeds the onside adiru which provides data to the onside fcc. Stick shaker is only activated by the symd. Mcas is only activated by the active fcc. Thank you for your corrections. So, the 861FL1 has another analog channel ...

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by fadecfault
Mon Apr 01, 2019 3:48 am
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

In order to elicit any comments and corrections, here is my current understanding of the AoA data path on the 737 MAX: https://i.ibb.co/7bSG2d1/Ao-A-datapath.jpg Incorrect. There are 2 channels on the aoa. One feeds the symd and the other feeds the onside adiru which provides data to the onside fcc...

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by fadecfault
Sat Mar 30, 2019 9:57 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

... it is a basic flight maneouver to practise recovery from stall time and time again in training. By the time a pilot gets to a commercial flight deck they should have done this at least 100 times (at least I did in Canada plus spin recovery which is pretty basic to get out of as well although th...

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by fadecfault
Tue Mar 26, 2019 10:53 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

AoA (sensors) *should* have no impact on airspeed whatsoever. Unreliable airspeed indications WOULD explain both the presumed (on my part) early pull to rotation and the delayed liftoff as well as the dramatic over-normal-speed seen after liftoff in the FR data. While we don't have hard confirmatio...

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by fadecfault
Tue Mar 26, 2019 9:18 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

This I will agree to entirely. Regardless of MCAS, the AC was not performing as it should have been right out of the gate, it must have been very alarming regardless the RC of the issues. Honest questions. We have third party reports of unreliable airspeed, could this be indicative or causal of app...

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by fadecfault
Tue Mar 26, 2019 8:40 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

One thing to note is that the SIC had the benefit of a benign control column and yet he still found it tiresome; the PIC had the added complication of continuous stick shaker. Have you ever operated a hydraulic jackhammer? I thought I read somewhere that even though the JT610's SIC's stick shaker w...

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by fadecfault
Sat Mar 23, 2019 8:08 pm
Forum: Civil Aviation
Topic: Ethiopian Airlines 737MAX crashes enroute to Nairobi Q1 2019
Replies: 5479
Views: 722258

Re: Ethiopian Airlines 737MAX crashes enroute to Nairobi

After much reading, I cannot say that I understand the failure mode of the Lion air left AoA sensor, but I have a plausible theory. To me, it would seem like a calibration error (the sensor was following the other one but with a 20-22 deg offset). However, there is no mandatory calibration in the f...

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by fadecfault
Sun Feb 17, 2019 9:39 am
Forum: Technical/Operations
Topic: Lion Air crash from maintenance perpective
Replies: 13
Views: 2351

Re: Lion Air crash from maintenance perpective

WIederling wrote:
fadecfault wrote:
Here you go. Had to truncate the image due to obvious reasons.
https://i.ibb.co/BjmNvQX/mdr.jpg


Thank you. the Fat Black LIne is overall average?

No it's the subject carrier from the report.

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by fadecfault
Fri Feb 15, 2019 5:28 pm
Forum: Technical/Operations
Topic: Lion Air crash from maintenance perpective
Replies: 13
Views: 2351

Re: Lion Air crash from maintenance perpective

Fun Fact: Per my companies internal doc it shows Lion air averaged a 99.7% MAX mechanical dispatch reliability from sep 17 to nov 18 . No other max carrier came close with each having normal drops in MDR that you would see with a new type a/c. Draw your own conclusion. Interesting figure! Interesti...

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by fadecfault
Thu Feb 14, 2019 9:16 pm
Forum: Technical/Operations
Topic: Lion Air crash from maintenance perpective
Replies: 13
Views: 2351

Re: Lion Air crash from maintenance perpective

There was a lot of talk regarding Lion Air Crash especially about MCAS, pilots, AOA sensor, etc... There was also talk about the poor safety record. I would like to talk about aircraft maintenance, more importantly about the compliance with the procedures in the AMM (Aircraft Maintenance Manual) an...

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by fadecfault
Thu Jan 17, 2019 9:57 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

1 Control column. . . . . . . . . . . . . . . . . Hold firmly 2 Autopilot (if engaged) . . . . . . . . . . . . .Disengage Do not re-engage the autopilot. Control airplane pitch attitude manually with control column and main electric trim as needed. 3 If the runaway stops: CHECKLIST COMPLETED ------...

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by fadecfault
Thu Jan 17, 2019 9:13 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

No, the argument is not the incremental activation but the fact, that it stopped immediately by applying manual trim on the yoke. --> Stopped automatic trim ≠ trim runaway. 1 Control column. . . . . . . . . . . . . . . . . Hold firmly 2 Autopilot (if engaged) . . . . . . . . . . . . .Disengage Do n...

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by fadecfault
Thu Jan 17, 2019 8:41 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

No, the argument is not the incremental activation but the fact, that it stopped immediately by applying manual trim on the yoke. --> Stopped automatic trim ≠ trim runaway. 1 Control column. . . . . . . . . . . . . . . . . Hold firmly 2 Autopilot (if engaged) . . . . . . . . . . . . .Disengage Do n...

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by fadecfault
Wed Jan 16, 2019 12:08 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

He's trying to argue that because mcas moves in increments rather than a single continual application that it would not be considered a runway trim situation. No, the argument is not the incremental activation but the fact, that it stopped immediately by applying manual trim on the yoke. --> Stoppe...

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by fadecfault
Wed Jan 16, 2019 11:41 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

there are a lot of trimm operations from flightcontrols all the time they start and they stop and then they start again how would those guys know that the trim opration they experienced are NOT one oft the usual ones? Because the trim operations that the aircraft was performing meant the aircraft w...

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by fadecfault
Tue Jan 15, 2019 11:16 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

In what way was it stepped? Because they re-engaged flaps? Every time they manually trimmed, MCAS got out of the way. When they got the airplane in trim and stopped manually trimming, MCAS would jump back in and trim the nose down. It's kind of hair-splitting, I would think, to say that this behavi...

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by fadecfault
Tue Jan 15, 2019 10:11 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

I quote from the linked QRH. "Uncommanded stabilizer trim movement occurs continuously" In this case the stabilizer movement was not continuous but in stepped stages as per the MCAS design. Hence this QRH was not obviously applicable. In what way was it stepped? Because they re-engaged fl...

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by fadecfault
Tue Jan 15, 2019 7:29 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Boeing stopped short of that particular statement No, as a matter of fact that statement is in your link if you read far enough. I just find it interesting that Boeing felt the need to point out the fact. I take your point that the evidence at hand so far suggests the crew did not run the runaway s...

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by fadecfault
Tue Jan 15, 2019 10:51 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

It is not a stick pusher design and does not push forward. It will resist pulling backwards but it's not clear exactly how much force. The FDR data from the 3 elevator position sensors need to be seen to really figure out what happened. Peter Lemme posted FDR data/graph showing column force data be...

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by fadecfault
Mon Jan 14, 2019 8:38 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

So many posts on here now, but.... Did I imagine that the stick force pushing forward increases every time a 6 second burst occurs? Could the break in pulling back as per FDR, be because a crew member had to exert so much physical force, one of them had to get out of their seat to push rather than ...

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by fadecfault
Mon Jan 14, 2019 8:30 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

But this wasn't a runaway trim in the way that the pilots are trained for. For that the trim switches are ineffective. Here the trim actions were intermittent and stopped by trim adjustments. So it wasn't the trained for runaway trim. Cite your source stating just because trim switches stop the mov...

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by fadecfault
Fri Dec 28, 2018 6:36 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

https://www.wsj.com/articles/maintenance-lapse-identified-as-initial-problem-leading-to-lion-air-crash-11545739204?mod=e2tw Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash Crash investigators have concluded preliminarily that improper calibration of an airspeed (AoA?) sens...

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by fadecfault
Fri Dec 28, 2018 3:52 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

https://www.wsj.com/articles/maintenance-lapse-identified-as-initial-problem-leading-to-lion-air-crash-11545739204?mod=e2tw Maintenance Lapse Identified as Initial Problem Leading to Lion Air Crash Crash investigators have concluded preliminarily that improper calibration of an airspeed (AoA?) sens...

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by fadecfault
Fri Dec 14, 2018 10:46 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Lion Air is responsible for this crash. So easy. But it's easy too to see some parts of the story where Lion Air did not have any responsibilities: - Design of an unstable aircraft requiring automated augmentation system even in manual flight. - Design of a automated augmentation system highly depe...

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by fadecfault
Mon Dec 10, 2018 7:05 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

We can not assume it had the same problem after the AOA was changed. It was only after the AOA was changed the next flight crew (JT093) experienced CA stick shaker through the entire flight along with probable mcas operation. As we discussed 4 or 5 pages ago the smyd uses a separate channel of the ...

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by fadecfault
Mon Dec 10, 2018 12:11 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

The prelim report seems to indicate they - JT043 pilots - solved the heavy stick problem by using the Stab Trim cutout switches: After three automatic AND trim occurrences, the SIC commented that the control column was too heavy to hold back. At 14:25:46 UTC, the PIC declared “PAN PAN” to the Denpa...

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by fadecfault
Sun Dec 09, 2018 9:14 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

The computation for airspeed is contained within the adiru system schematic but I can not post that. But you can tell us what brand and/or model of ADIRU is on the 737Max right? Also, I have a hard time believing the following (exerpt from the manual page posted by fadecfault) is not a typo. Airspe...

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by fadecfault
Sun Dec 09, 2018 6:41 pm
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Can't post the diagram. This will have to suffice: I always thought the reason for the AOA data to the ADIRU was for PLI, and maximum, minimum, maneuvering, and reference speeds. From the FIM: 814. AOA Signal Fail - Fault Isolation That is with the benifit of hindsight, ADIRU or wiring issues can c...

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by fadecfault
Sun Dec 09, 2018 10:18 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

That being said I do think it is still possible there was another fault somewhere else. I checked our fleet history going back years and the AOA has been very reliable. I have a hard time believing a bad AOA was swapped for another bad AOA. Looks like a good AoA was replaced with another good AoA. ...

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by fadecfault
Sun Dec 09, 2018 9:26 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

From the FIM: 814. AOA Signal Fail - Fault Isolation A. Description (1) This task is for this maintenance message: (a) 34-21023 AOA SIGNAL FAIL (2) The maintenance message is identical for the left and right air data inertial reference systems (ADIRS). The left ADIRS maintenance message is shown on ...

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by fadecfault
Sun Dec 09, 2018 9:12 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

There's ready an adiru fault light. I have 737 maintenance manuals/schematics etc accessible to me so I'm pretty sure I know what time talking about. But your schematics and things don't go into what's inside the ADIRU right? The ADIRU would be a line replaceable unit, a blackbox in an aircraft mai...

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by fadecfault
Sun Dec 09, 2018 7:43 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

...the pitot/static system provides the airspeed/altitude information. Any splits in altitude/airspeed between the captain's and fo's instruments was not due to the AOA split -- something else was going on. From my notes: Data from the FDR showed erroneous airspeed and/or AOA data on the last four ...

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by fadecfault
Sun Dec 09, 2018 7:39 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

AOA DISAGREE The AOA DISAGREE alert indicates the left and right angle of attack vanes disagree. 1 Airspeed errors and the IAS DISAGREE alert may occur. 2 Altimeter errors and the ALT DISAGREE alert may occur. Says "may" occur. Isn't this to cover the case of a bad ADIRU (instead of just ...

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by fadecfault
Sun Dec 09, 2018 7:11 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

1. The aoa does affect airspeed and altitude and because there was such a large split in aoa, the altitudes were different on the fo and capts display. The split is shown in the FDR graph so there's no dispute in that. You have lost me there, I am not aware of any real-time AOA calibration for IAS....

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by fadecfault
Sun Dec 09, 2018 6:59 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

1. The aoa does affect airspeed and altitude and because there was such a large split in aoa, the altitudes were different on the fo and capts display. The split is shown in the FDR graph so there's no dispute in that. You have lost me there, I am not aware of any real-time AOA calibration for IAS....

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by fadecfault
Sun Dec 09, 2018 5:16 am
Forum: Civil Aviation
Topic: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang
Replies: 3187
Views: 598996

Re: Lion Air 737MAX8 Crashed Jakarta to Pangkal Pinang

Not new information; but, worthy of consideration: The pilots reported that they could not trust their instruments - including altitude. A failed AOA sensor or shorted AOA system and MCAS commands would not do that. It appears that there were other issues going on. The CVR will reveal a lot. What p...

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by fadecfault
Wed Dec 05, 2018 2:22 am
Forum: Civil Aviation
Topic: Reuters: Lion Air ponders cancellation of 737 MAX orders
Replies: 156
Views: 30053

Re: Reuters: Lion Air ponders cancellation of 737 MAX orders

Your only difference is quite a big difference. And an attentive pilot still has 2 ways to override the latch. One way is literally at their finger tips. IF they have been trained to do it, and informed they could; which the AA & WN Pilot Unions say they have not. Per the NTSC report: "3.1...

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