Boeing expects to complete an important 737 MAX certification flight by the end of the month, still hoping for FAA certification before the end of the summer.

The manufacturer told airlines it hoped to conduct the certification test flight of the 737 MAX by the end of June 2020, according to sources close to the matter quoted by Bloomberg. The sources added that the flight could be postponed to July 2020.

The plane has been grounded since March 2019 following two crashes that killed 346 victims. The test flight, carried out by pilots of the Federal Aviation Administration, will certify the updated MCAS system involved in both crashes. 

Additionally, the wiring problem discovered in January 2020 was resolved and will be the subject of an FAA bulletin. The pilot training manual, which initially failed to mention the MCAS, has been revised and delivered to operators.

The United States Federal Aviation Administration (FAA) plans to require Boeing to modify certain electrical wiring on all 737 MAX before authorizing the aircraft to take back to the skies, media reports.

While Boeing remained silent on the matter, the FAA gave Reuters its usual answer. The authority said it was "in regular contact with Boeing as the company continues its work on the 737 MAX,” and added that “the aircraft will be cleared for return to passenger service only after the FAA is satisfied that all safety-related issues are addressed.”

A total fleet of 800 Boeing 737 MAX, already delivered or waiting to be, needs the green light of the FAA to resume operations. The production of the aircraft, suspended in January 2020 to avoid storage deficit, resumed at Renton facility in late May 2020.

Boeing has resumed the production of the once hailed "gamechanger" aircraft, the 737 MAX. The production pause lasted since January 2020, as Boeing also used the time to improve the quality of its assembly line in Renton, Washington.