Washington, July 1 (TIWN) A US government report has found that airplane giant Boeing failed to submit certification documents to the Federal Aviation Administration (FAA) detailing changes to a key flight control system of the globally grounded 737 MAX aircraft, th media reported.

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 aircraft's existing speed trim system, with limited range and use, Xinhua news agency quoted a Reuters report as saying on Tuesday.