All Boeing 737 Max 8 and 9 aircraft will remain grounded at least until May after the fatal Ethiopian Airlines crash on Sunday, the US Federal Aviation Administration (FAA) has said.
The US regulator further said that the aircraft cannot fly so that the flight control software can be installed and a fix to the software can be fully tested.
US Representative Rick Larsen said the software upgrade would take a few weeks to complete, and installing it on all the aircraft would take “at least through April”.
The FAA said on Wednesday that a software fix for the 737 Max that Boeing had been working on since the Lion Air crash would take months to complete.
Almost 400 of the aircraft have been banned from the skies after an Ethiopian Airlines 737 Max 8 crashed near Addis Ababa on Sunday, killing all 157 people on board.
It was the second time a 737 Max 8 has crashed in five months, following the loss of a Lion Air jet off Indonesia in October, with the loss 189 lives.