Pilots of the crashed Ethiopian airlines Boeing 737 Max to be unable to prevent the aircraft repeatedly nosediving despite following procedures, an initial report has found.

The captain and an initial officer followed safety measures recommended through Boeing. However they couldn't avoid the aircraft going right into a fatal dive soon after take turn off from Addis Ababa on 10 March, the report through Ethiopian investigators said. Every 157 world on plank were killed.

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Aviation authorities base the entire global fleet that 737 Max aircraft in march after 2 fatal crashes in five months.

The Ethiopian airlines crash complied with a Lion waiting crash in Indonesia in October, which left 189 dead.

Flight ET302 took off from Ethiopian capital Addis Ababa at 08:38 neighborhood time (05:38 GMT) on 10 March because that a two-hour trip to the Kenyan capital, Nairobi.


Six minute later, at 08:44, the crashed 30 miles southeast the the airport, near the city of Bishoftu.

The impact was for this reason great, both engines were buried at a depth the 10m (32ft), in a crater 28m large and 40m long.

The preliminary report right into the accident, by Ethiopia's plane Accident examination Bureau, said the plane's take-off appeared normal.

However, a brief time later two sensors the measured the angle of the plane's flight started to record various readings.


This motivated an automatic safety mechanism which repeatedly driven the nose of the aircraft down - something the was likewise recorded during the deadly Lion wait flight.

The Ethiopian authorities' report argues the pilots adhered to steps to disengage the system, however even after manually make the efforts to stable the plane, the system pushed the nose down till the aircraft crashed.

The report did no attribute blame because that the crash, but a detailed timeline says the pilots were struggling to deal with an automated safety system - well-known as the Manoeuvring characteristics Augmentation system (MCAS).


A stall can occur when the aircraft flies at also steep one angle. This have the right to reduce the lift created by the wings, perhaps making the airplane drop.

In the 737 Max, MCAS walk this automatically, moving the aircraft earlier to a "normal" flight position.

However, after the Lion wait crash, it was found the aircraft had experienced problems with a sensor i m sorry calculates the edge of flight, or "angle of attack".

Image caption, Investigators think faulty trip sensors might be possible factors in both recent 737 Max crashes

If this sensor offers a false reading, MCAS might activate and also push the sleep down when nothing is wrong.

Although the Ethiopian authorities' report walk not point out MCAS by name, the does imply the pilots to be struggling to manage the aircraft's angle of flight and says among the sensors was giving erroneous readings.

08:38 A sensor ~ above the pilot's side falsely suggests that the airplane is close to stalling, triggering MCAS and pushing under the nose of the plane08:39-40 The pilots shot to respond to this through adjusting the angle of stabilisers on the tail the the plane using electrical switches top top their manage wheels to carry the nose earlier up08:40 They then disable the electrical system the was powering the software application that thrust the sleep down08:41 The crew then attempt to control the stabilisers manually v wheels - something difficult to execute while travelling at high speed08:43 When this doesn't work, the pilots rotate the electricity back on and again try to move the stabilisers. However, the automated device engages again and the airplane goes right into a dive native which it never ever recovered

Dagmawit Moges, Ethiopia's deliver minister, stated that the flight crew repeatedly followed procedures recommended by the plane's manufacturer yet "were no able to control the aircraft".

In a statement, the chief executive, management of Ethiopian Airlines, Tewolde GebreMariam, claimed he was "very proud" the the pilots' "high level of experienced performance".

"It was very unfortunate they can not recoup the aircraft from the persistence the nosediving," the airline claimed in a statement.

Boeing CEO Dennis Muilenburg recognized that one "erroneous activation" the MCAS had developed in both recent crashes.

But the agency was "confident in the fundamental safety the the 737 MAX", he said, adding that imminent software fixes would certainly make the aircraft "among the most safe airplanes ever to fly."

A final report by Ethiopian authorities, aided by air-safety professionals from the US and Europe, is as result of be published within a year.

Investigators have pointed to similarity in flight data transmitted through the 2 737 Max planes that crashed in Ethiopia and also Indonesia.

Vertical rate readings, which show how quick a airplane is going up and down, were erratic and also suggest the both set of pilots to be struggling to preserve a steady climb after take-off.

The united state Federal Aviation administration (FAA), i m sorry is investigate the crash alongside the Ethiopian national Transportation security Board, has actually said evidence gathered at the site and satellite data verified the 2 flights behaved "very similarly".

"The proof we found on the ground made that even an ext likely the trip path was an extremely close come Lion Air's," claimed Dan Elwell, exhilaration administrator at the FAA.

This ground evidence is reported to be a piece of wreckage from the tail ar which shows that the horizontal stabiliser was collection to point the aircraft nose downwards.

The black color box trip recorders - the flight data recorder and also cockpit voice recorder - from the aircraft room being examined by investigators in Paris.

After the Lion waiting crash, Boeing issued guidance to pilots on exactly how to manage MCAS, but a software settle to remedy the difficulty has been consistently delayed.

US regulators and safety experts are now asking exactly how thoroughly the FAA and also Boeing vetted the anti-stall system and how fine pilots approximately the world were trained because that it when their airlines bought brand-new planes.

A warning light which can have alerted pilots to a difficulty with the trip sensors was not fitted to either of the planes that crashed.

Boeing simulator tests have likewise found that MCAS behaved much much more powerfully than expected, continuously forcing the aircraft nose down.

In a simulation of the Lion air flight, test pilots uncovered they had less than 40 seconds to get over the problem before the plane went right into a unrecoverable nose-dive, the new York times reported.

It is the latest in the company's successful 737 line. The group contains the Max 7, 8, 9 and 10 models.

The aircraft is the fastest-selling in Boeing's history. More than 4,500 have actually been ordered through 100 various operators globally.

By the end of January, Boeing had ceded 350 that the Max 8 models. Lock have been in commercial use since 2017.

The Max 8 that crashed in march was one of 30 ordered as component of Ethiopian Airlines' expansion. It underwent a "rigorous very first check maintenance" top top 4 February, the airline said.

A small variety of Boeing's Max 9s are likewise operating. The Max 7 and 10 models, not yet delivered, room due for roll-out in the next couple of years.

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There have been an ext than a dozen succeeding models and also it stays the best-selling commercial aircraft ever before made, with some 10,000 produced.