US aviation regulators allowed Boeing's 737 Max aircraft to continue flying despite knowing there was a risk of further crashes.
Analysis after the first crash last year predicted there could be up to 15 disasters over the lifetime of the aircraft without design changes.
Despite this, the Federal Aviation Administration did not ground the Max until a second crash five months later.
The FAA's investigation of the October Indonesia crash called for Boeing to redesign its system, warning of a risk of more than a dozen crashes over the 45-year lifetime of the roughly 4,800 737 Max planes in service.
Regulators also issued an alert to airlines, but the agency did not ground the aircraft until after the 10 March Ethiopia crash, several days after action by other countries.
Boeing staff have also raised concerns that the company was prioritising speed over safety at the factory that produced Max 737s, contributing to the crashes.
There was quite a revelation on the first day of the hearing: the FAA, the US aviation safety regulator, conducted its own analysis after the first crash and concluded that it was more likely to crash than previous models of the 737 - and yet the plane continued to fly.
It was said that because of a lack of resources at the FAA, Boeing had in effect been "marking their own homework" when it came to assessing the 737 Max's airworthiness.
Aviation expert John Strickland said the process of clearing the plane for a return to the skies would be "extremely long", but that it was "crucial" that Boeing got it right.
OveLix έγραψε: Το άρθρο τονίζει ότι η Boeing αφιερώνει μόλις το 7% των πωλήσεών της στην έρευνα και ανάπτυξη έναντι 10% της Airbus. (Σημείωση δική μου: μπορεί η διαφορά να φαίνεται μικρή, αλλά είναι από το 7 ως το 10 είναι αύξηση 43%).
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