Addis Ababa - Pilots of an Ethiopian Airlines jet wrestled with controls to stay aloft but plunged to the ground after restoring current to a computer system that was ordering the nose down because of faulty sensor data, a preliminary report showed on Thursday.
"It is recommended that the aircraft flight control system related to the flight controllability shall be reviewed by the manufacturer", Dagmawit said at the news conference, without directly naming the MCAS.
It suggested that Boeing review the aircraft control system and aviation authorities confirm the problem had been solved before allowing that model of plane back into the air.
The Max 8 has been under scrutiny since a Lion Air flight crashed off the coast of Indonesia under similar circumstances in October.
This last finding casts serious doubt on the adequacy of the emergency procedures Boeing and the Federal Aviation Administration directed pilots to follow after the first crash. Boeing's procedures instruct pilots to leave the MCAS system disconnected and continue flying manually for the rest of the flight.
The aircraft manufacturer's CEO Dennis Muilenburg was on board Wednesday's 737 MAX 7 demo flight which was upgraded with the new Maneuvering Characteristics Augmentation System (MCAS) software update, according to Boeing.
Both pilots in the Ethiopian Airlines crash underwent additional training following the Lion Air incident.More news: Nintendo Switch Online adds the freakishly hard NES Mario next week
The comments underscored the need for a software update that Boeing already has under way for an anti-stall system that can push down the plane's nose.
Since that initial Lion Air crash, the FAA and Boeing have released instructions on how to deactivate this component of the autopilot and recover control of the aircraft.
The chairman of the Senate Commerce Committee said this week that whistleblowers have come forward to report that FAA safety inspectors, including those involved with approvals for the 737 Max, lacked proper training and certifications.
Worldwide, several governments have issued orders to ground this series of jets, leading to flight cancellations and rescheduling, causing havoc in the aviation sector of some countries.
They reportedly switched off the anti-stall software - known as MCAS - but it re-engaged and pushed the jet downwards, aviation sources close to the investigation told ABC News.
Recognizing a problem with the automatic trim, the pilots followed emergency procedures and turned off the system.
Speaking in a statement issued in the wake of the report Ethiopian Airlines Chief Executive Tewolde GebreMariam said he was "very proud" of the pilots' who demonstrated a "high level of professional performance".