Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 03 Apr 2019, 17:51

The crew of Ethiopian Airlines Boeing 737MAX8 used the prescribed Stabilator Trim Cut-Out switches to stop MCAS system, according to an article by Wall Street Journal, which cites information coming from the investigation.

According to Reuters, the MCAS re-engaged as many as four times after the crew initially turned it off due to suspect data from an airflow sensor, two people familiar with the matter said.

That information is not good for Boeing: what would you think of a system that annihilates the efforts of the pilots to save the aeroplane?
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 03 Apr 2019, 21:24

sn26567 wrote:
03 Apr 2019, 17:51
The crew of Ethiopian Airlines Boeing 737MAX8 used the prescribed Stabilator Trim Cut-Out switches to stop MCAS system, according to an article by Wall Street Journal, which cites information coming from the investigation.

According to Reuters, the MCAS re-engaged as many as four times after the crew initially turned it off due to suspect data from an airflow sensor, two people familiar with the matter said.

That information is not good for Boeing: what would you think of a system that annihilates the efforts of the pilots to save the aeroplane?
And here is Dominic Gates' article in The Seattle Times:

https://www.seattletimes.com/business/b ... an-flight/
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by Bracebrace » 04 Apr 2019, 09:45

Those who have done testflights with cut hydraulic systems will realise that the simulated scenario's (manual reversion) don't always prepare you for the vicious "physical" situation of a slight out of trim combined with flying the damn thing through the cables.

Same thing for the aerodynamic trim runaway that looks easy IF you've done it in the simulator... but many simulators don't even allow the training anymore and many pilots don't know how to solve the situation and hence will find themselves fighting full force (unnecessary) with manual trim.

Books and simulators don't teach you the physical side of reality.

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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn-remember » 04 Apr 2019, 11:16

This is well explained here : 'Nowhere is it described the trim could be impossible to move if the Cut-Out switches were cut at the slightest miss-trim at the speeds flown. And there is no warning on when to move the Cut-Out switches, the checklist says “Cut, then trim manually.” This is not the whole truth.'
https://leehamnews.com/2019/04/03/et302 ... more-29790

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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 04 Apr 2019, 18:35

The AIB of Ethiopia has published the preliminary report:

http://www.ecaa.gov.et/documents/20435/ ... T-AVJ).pdf (pdf, 33 pages)

Executive Summary:

On March 10, 2019, at 05:38 UTC, Ethiopian Airlines flight 302, Boeing 737-8(MAX), ET-AVJ, took off from Addis Ababa Bole Int. Airport bound to Nairobi, Kenya Jomo Kenyatta Int. Airport. Shortly after takeoff, the Angle of Attack sensor recorded value became erroneous and the left stick shaker activated and remained active until near the end of the flight. In addition, the airspeed and altitude values from the left air data system began deviating from the corresponding right side values. Due to flight control problems, the Captain was unable to maintain the flight path and requested to return back to the departure airport. The crew lost control of the aircraft which crashed at 05:44 UTC 28 NM South East of Addis Ababa near Ejere village.

Ethiopian Airlines and Boeing both made a statement on that report:

https://www.aviation24.be/airlines/ethi ... -on-et302/
https://www.aviation24.be/airlines/ethi ... ry-report/
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by telspace2005 » 05 Apr 2019, 08:36

Few weeks ago I posted :

" Knowing that your next flight is with a 737 Max 8, can you cancel or change your flight without prejudice?
The answer was : Off-course....not!
Now I'll use a booking site that will tell me which kind of plane is to be used... and I will not book.

What was said yesterday on the BBC, it seems that the MAX might have other potentials problems that the MACS. That plane should have been a new design, and not an upgrade on the old 737.
Other frigthing matters : Boeing certified itself and alone parts of the plane or procedures. The FAA was not even invited. The journalist added that millions of people will not trust that plane anymore.
I am one of them.

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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 05 Apr 2019, 10:06

Indonesian low-cost carrier Sriwijaya Air announced that it has cancelled its plans to lease two Boeing 737 MAX 8 jets.
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 05 Apr 2019, 10:59

sn26567 wrote:
03 Apr 2019, 21:24
And here is Dominic Gates' article in The Seattle Times:

https://www.seattletimes.com/business/b ... an-flight/
Image
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 05 Apr 2019, 23:08

Statement from Boeing CEO Dennis Muilenburg: We Own Safety - 737 MAX Software, Production and Process Update

As we work closely with customers and global regulators to return the 737 MAX to service, we continue to be driven by our enduring values, with a focus on safety, integrity and quality in all we do.

We now know that the recent Lion Air Flight 610 and Ethiopian Airlines Flight 302 accidents were caused by a chain of events, with a common chain link being erroneous activation of the aircraft's MCAS function. We have the responsibility to eliminate this risk, and we know how to do it. As part of this effort, we're making progress on the 737 MAX software update that will prevent accidents like these from ever happening again. Teams are working tirelessly, advancing and testing the software, conducting non-advocate reviews, and engaging regulators and customers worldwide as we proceed to final certification. I recently had the opportunity to experience the software update performing safely in action during a 737 MAX 7 demo flight. We're also finalizing new pilot training courses and supplementary educational material for our global MAX customers. This progress is the result of our comprehensive, disciplined approach and taking the time necessary to get it right.

As we continue to work through these steps, we're adjusting the 737 production system temporarily to accommodate the pause in MAX deliveries, allowing us to prioritize additional resources to focus on software certification and returning the MAX to flight. We have decided to temporarily move from a production rate of 52 airplanes per month to 42 airplanes per month starting in mid-April.

At a production rate of 42 airplanes per month, the 737 program and related production teams will maintain their current employment levels while we continue to invest in the broader health and quality of our production system and supply chain.

We are coordinating closely with our customers as we work through plans to mitigate the impact of this adjustment. We will also work directly with our suppliers on their production plans to minimize operational disruption and financial impact of the production rate change.

In light of our commitment to continuous improvement and our determination to always make a safe industry even safer, I've asked the Boeing Board of Directors to establish a committee to review our company-wide policies and processes for the design and development of the airplanes we build. The committee will confirm the effectiveness of our policies and processes for assuring the highest level of safety on the 737-MAX program, as well as our other airplane programs, and recommend improvements to our policies and procedures.

The committee members will be Adm. Edmund P. Giambastiani, Jr., (Ret.), former vice chairman, U.S. Joint Chiefs of Staff, who will serve as the committee's chair; Robert A. Bradway, chairman and CEO of Amgen, Inc.; Lynn J. Good, chairman, president and CEO of the Duke Energy Corporation; and Edward M. Liddy, former chairman and CEO of the Allstate Corporation, all members of the company's board. These individuals have been selected to serve on this committee because of their collective and extensive experiences that include leadership roles in corporate, regulated industries and government entities where safety and the safety of lives is paramount.

Safety is our responsibility, and we own it. When the MAX returns to the skies, we've promised our airline customers and their passengers and crews that it will be as safe as any airplane ever to fly. Our continued disciplined approach is the right decision for our employees, customers, supplier partners and other stakeholders as we work with global regulators and customers to return the 737 MAX fleet to service and deliver on our commitments to all of our stakeholders.

CHICAGO, April 5, 2019 /PRNewswire/

SOURCE Boeing

The Boeing communication is mainly addressed to the airlines that it wants to keep as customers. Very little for the passenger...

And then this from an American journalist who is a fine connoisseur of the airline industry:
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 07 Apr 2019, 18:54

The Bloomberg news portal is reporting that Ethiopian Airlines is reconsidering its orders for Boeing 737 MAX jets following the release of a preliminary report into the ET302 crash.

We may reach the decision: Look, we just had a very tragic accident a few weeks ago, and customers still have the accident in their mind. So it will be a hard sell for us to convince our customers,” CEO Tewolde GebreMariam is quoted to have said.

Ethiopian had earlier ordered 30 of the now controversial jets with five delivered at the time of the crash. The airline will not take delivery of the remaining 25 anytime soon – or perhaps at all, Tewolde said.

http://www.africaglobalvillage.com/ethi ... ax-orders/
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 11 Apr 2019, 12:32

China, EASA, Ethiopia, Indonesia and at least five other major regulators are expected to join the FAA review panel on the B737 MAX.
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Re: Ethiopian Airlines Boeing 737 MAX crashes between Addis Ababa and Nairobi - Impact on Boeing 737 MAX

Post by sn26567 » 15 Sep 2019, 17:39

Interpol has announced the successful completion of the identification procedures of all victims of the Ethiopian Airlines plane crash in March this year that killed all 157 people on board.

http://www.canindia.com/all-ethiopian-a ... -interpol/
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