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Political Information Last Updated: Mar 17, 2019 - 11:12:07 PM


The Best Analysis Of What Really Happened To The Boeing 737 Max From A Pilot & Software Engineer
By Tyler Durden
Mar 19, 2019 - 4:25:14 PM

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https://www.zerohedge.com/news/2019-03-17/best-analysis-what-really-happened-boeing-737-max-pilot-software-engineer

 

The following tweets from Trevor Sumner, CEO of Perch Experience, of what really happened to the Boeing 737 Max, may be one of the best summaries of the events that led to the two recent airplane crashes, and also why Boeing's "software upgrade" response is a farce.


Trevor Sumner@trevorsumner

1of x: BEST analysis of what really is happening on the issue from my brother in law @davekammeyer, who's a pilot, software engineer & deep thinker. Bottom line don't blame software that's the band aid for many other engineering and economic forces in effect.👇🎖🤔

4,4971:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

3,185 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

Some people are calling the 737MAX tragedies a failure. Here's my response: It's not a software problem. It was an

* Economic problem that the 737 engines used too much fuel, so they decided to install more efficient engines with bigger fans and make the 737MAX.

8841:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

566 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

This led to an

* Airframe problem. They wanted to use the 737 airframe for economic reasons, but needed more ground clearance with bigger engines.The 737 design can't be practically modified to have taller main landing gear. The solution was to mount them higher & more forward.

2741:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

59 people are talking about this

 


Trevor Sumner@trevorsumnerReplying to @trevorsumner

This led to an

* Aerodynamic problem. The airframe with the engines mounted differently did not have adequately stable handling at high AoA to be certifiable. Boeing decided to create the MCAS system to electronically correct for the aircraft's handling deficiencies.

2851:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

69 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

During the course of developing the MCAS, there was a

* Systems engineering problem. Boeing wanted the simplest possible fix that fit their existing systems architecture, so that it required minimal engineering rework, and minimal new training for pilots and maintenance crews.

2831:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

55 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

The easiest way to do this was to add some features to the existing Elevator Feel Shift system. Like the system, the relies on non-redundant sensors to decide how much trim to add. Unlike the EFS system, MCAS can make huge nose down trim changes.

2561:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

57 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

On both ill-fated flights, there was a:
* Sensor problem. The AoA vane on the 737MAX appears to not be very reliable and gave wildly wrong readings. On , this was compounded by a

2551:04 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

51 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

* Maintenance practices problem. The previous crew had experienced the same problem and didn't record the problem in the maintenance logbook. This was compounded by a:

2441:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

46 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

* Pilot training problem. On LionAir, pilots were never even told about the MCAS, and by the time of the Ethiopian flight, there was an emergency AD issued, but no one had done sim training on this failure. This was compounded by an:

2611:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

49 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

* 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.

4081:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

129 people are talking about this

Trevor Sumner@trevorsumner · Mar 17, 2019Replying to @trevorsumner

* 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.

Trevor Sumner@trevorsumner

All of this was compounded by a:

* Pilot expertise problem. If the pilots had correctly and quickly identified the problem and run the stab trim runaway checklist, they would not have crashed.

2711:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

55 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

Nowhere in here is there a software problem. The computers & software performed their jobs according to spec without error. The specification was just shitty. Now the quickest way for Boeing to solve this mess is to call up the software guys to come up with another band-aid.

5351:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

151 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

I'm a software engineer, and we're sometimes called on to fix the deficiencies of mechanical or aero or electrical engineering, because the metal has already been cut or the molds have already been made or the chip has already been fabed, and so that problem can't be solved.

4601:05 AM - Mar 17, 2019 · Brooklyn, NYTwitter Ads info and privacy

82 people are talking about this

Trevor Sumner@trevorsumnerReplying to @trevorsumner

But the software can always be pushed to the update server or reflashed. When the software band-aid comes off in a 500mph wind, it's tempting to just blame the band-aid.

Follow @davekammeyer if you want to dig in.

8751:05 AM - Mar 17, 2019 · Brooklyn, NY
[Colour fonts and bolding added.].



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