write an article in any news. (at least 4 paragraph)
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article about the boeing 737 max crash
Pilots of the crashed Ethiopian Airlines Boeing 737 Max were unable to prevent the plane repeatedly nosediving despite following procedures, an initial report has found.
The captain and first officer followed safety procedures recommended by Boeing. But they couldn't stop the aircraft going into a fatal dive shortly after take off from Addis Ababa on 10 March, the report by Ethiopian investigators said. All 157 people on board were killed.
Aviation authorities grounded the entire global fleet of 737 Max aircraft in March after two fatal crashes in five months.
The Ethiopian Airlines crash followed a Lion Air crash in Indonesia in October, which left 189 dead.
What happened?
Flight ET302 took off from Ethiopian capital Addis Ababa at 08:38 local time (05:38 GMT) on 10 March for a two-hour flight to the Kenyan capital, Nairobi.
Six minutes later, at 08:44, it crashed 30 miles southeast of the airport, near the town of Bishoftu.
The impact was so great, both engines were buried at a depth of 10m (32ft), in a crater 28m wide and 40m long.
Who are the victims?
What do we know about Boeing 737 Max 8?
Which airlines use the 737 Max 8?
The preliminary report into the accident, by Ethiopia's Aircraft Accident Investigation Bureau, said the plane's take-off appeared normal.
However, a short time later two sensors that measured the angle of the plane's flight began to record different readings.
This triggered an automated safety system which repeatedly pushed the nose of the plane down - something that was also recorded during the fatal Lion Air flight.
The Ethiopian authorities' report suggests the pilots followed steps to disengage the system, but even after manually trying to steady the plane, the system pushed the nose down until the aircraft crashed.
What is the computer system under question?
The report did not attribute blame for the crash, but a detailed timeline suggests the pilots were struggling to deal with an automated safety system - known as the Manoeuvring Characteristics Augmentation System (MCAS).
The system is designed to prevent the plane stalling when making steep turns under manual control.
A stall can happen when the plane flies at too steep an angle. This can reduce the lift generated by the wings, potentially making the plane drop.
To recover from a stall, a pilot would normally push the plane's nose down.
In the 737 Max, MCAS does this automatically, moving the aircraft back to a "normal" flight position.
The system then repeats the process if it detects the plane is still tilted at too great an angle.
However, after the Lion Air crash, it was found the aircraft had experienced problems with a sensor which calculates the angle of flight, or "angle of attack".
Investigators believe faulty flight sensors may be possible factors in both recent 737 Max crashes
If this sensor gives a false reading, MCAS may activate and push the nose down when nothing is wrong.
Although the Ethiopian authorities' report does not mention MCAS by name, it does suggest the pilots were struggling to control the aircraft's angle of flight and says one of the sensors was giving erroneous readings.
The pilots' five-minute struggle
08:38 A sensor on the pilot's side falsely indicates that the plane is close to stalling, triggering MCAS and pushing down the nose of the plane
08:39-40 The pilots try to counter this by adjusting the angle of stabilisers on the tail of the plane using electrical switches on their control wheels to bring the nose back up
08:40 They then disable the electrical system that was powering the software that pushed the nose down
08:41 The crew then attempt to control the stabilisers manually with wheels - something difficult to do while travelling at high speed
08:43 When this doesn't work, the pilots turn the electricity back on and again try to move the stabilisers. However, the automated system engages again and the plane goes into a dive from which it never recovered
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-pavani
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