Boeing Co. failed to submit certification documents to the U.S. Federal Aviation Administration (FAA) detailing changes to a key flight control system faulted in two fatal crashes, a long-awaited government report seen by Reuters has found.
The flight control system, known as MCAS, was "not an area of emphasis" because Boeing presented it to the FAA as a modification of the jet's existing speed trim system, with limited range and use, according to the report.
The 52-page report by the U.S. Department of Transportation's Office of Inspector General (IG), dated June 29 and set to be made public Wednesday, laid bare mistakes made by both the plane-maker and FAA in the development and certification of Boeing's top-selling aircraft.