The Dutch board on Tuesday acknowledged that it had changed portions of its draft report after the Americans raised objections, but called that “standard procedure” and noted that the Americans’ comments were included in an appendix.
“The Dutch Safety Board does its work in strict independence,” Mr. Dijsselbloem said. “The Board decides independently on the results of its investigations, the content of its reports and its conclusions and recommendations.”
A Boeing spokesman referred questions to the National Transportation Safety Board , which led the American team that commented on the Dutch draft report. An N.T.S.B. spokesman declined to comment.
The Federal Aviation Administration, which was also a member of the American team participating in the 2009 inquiry, said in a statement that it was “following a thorough process for returning the Boeing 737 Max to passenger service. ”The agency added that it was working with international safety regulators to review“ proposed changes to the aircraft ”as well as“ recommendations from safety experts who have examined our certification processes. ”
The Dutch board’s final report, released in 2010, focused blame on numerous mistakes by the pilots, including their failure to notice a dangerous drop in speed and their incorrect response to an alert warning of an impending stall. The report contained statements – some nearly verbatim and without attribution – that were originally written by the American team and further emphasized crew errors.
The Times found striking parallels between the accident and the Max crashes. In both cases, design decisions by Boeing allowed a single faulty sensor to activate a powerful computer command. In both cases, Boeing had known of the potential sensor failures but determined that pilots would react correctly and recover the plane. And in both cases, Boeing didn’t include information in the pilots ’manual that could have helped them respond to the malfunctioning automation.
Boeing, the F.A.A and the N.T.S.B. noted that the system involved in the earlier accident differed significantly from the one blamed in the Max crashes. But aviation safety experts, including a senior F.A.A. official who was not authorized to speak publicly, told The Times that the similarities were noteworthy.
Dr. Dekker’s report “should have woken everybody up,” one said. Instead, “the issue got buried.”