Details have begun to emerge of the final moments of an Ethiopian Airlines flight which crashed three weeks ago
All 157 people on board were killed when flight ET302 from Addis Ababa to Nairobi came down on 10 March.
Reports suggest an anti-stall system on the Boeing 737 Max has been highlighted as the cause of the crash.
Two minutes into the flight – at just 450ft (137m) above the ground – the aircraft’s nose began to pitch down, according to the Wall Street Journal.
The newspaper, which says it’s spoken to people close to the ongoing crash investigation, says the captain fought to control the plane when it began to dive.
The detailed report says one pilot said to the other “Pitch up, pitch up!” before the radio went dead and as the plane “accelerated” towards the ground.
It crashed only six minutes into the flight.
The Wall Street Journal says the information it has “paints a picture of a catastrophic failure that quickly overwhelmed the flight crew”.
Leaks this week from the crash investigation in Ethiopia and in the US suggest an automatic anti-stall system was activated at the time of the disaster.
The Manoeuvring Characteristics Augmentation System (MCAS) flight-control feature was also implicated in a fatal crash involving a Lion Air flight in Indonesia last October.
The Boeing 737 Max went down shortly after take-off from Jakarta, killing all 189 people on board.
An investigation of the Lion Air flight suggested the anti-stall system malfunctioned, and forced the plane’s nose down more than 20 times before it crashed into the sea.
The Ethiopian authorities have already said there are “clear similarities” between the Lion Air incident and the Ethiopian Airlines crash.
The airline and authorities have refused to comment on leaks from the investigation.
Concerns about the Boeing 737 Max have led to a worldwide grounding of the plane.
Boeing has redesigned the software so that it will disable MCAS if it receives conflicting data from its sensors.
As part of the upgrade, Boeing will install an extra warning system on all 737 Max aircraft, which was previously an optional safety feature.
Neither of the two planes that were involved in the fatal crashes carried the alert systems, which are designed to warn pilots when sensors produce contradictory readings.
The aircraft update is designed to ensure the MCAS will no longer repeatedly make corrections when a pilot tries to regain control.
Boeing is also revising pilot training to provide “enhanced understanding of the 737 MAX” flight system and crew procedures.
Earlier this week, Boeing said that the upgrades were not an admission that the system had caused the crashes.
Investigators have not yet determined the cause of the accidents, but a preliminary report from Ethiopian authorities is expected within days.
Boeing has tried to restore its battered reputation, while continuing to insist the 737 Max is safe.