Information contained on flight recorders for the Indones

sia and Ethiopian planes has not been released, but analysts say the pilots may not have known h

ow to turn off the anti-stall device after it pointed the nose of the plane down, and that may have been a factor in the crashes.

On Wednesday, Mike Sinnett, Boeing’s vice-president, said he doesn’t see the need to overhaul its development of aircraft. He c

alled the new Max software “more robust” but also said the upgrade does not mean the original design was inadequate.

The upgraded MCAS will be activated by input from two sensors rather than one.

The system’s power will be limited so that the pilot can pull back on

the control column to override the system if the plane’s nose is pointed down.

Sinnett said a new training system for pilots on upgrades to the MCAS has been “provisionally approved”.

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