Boeing Completes Final 737 Max 10 Certification Flight Test Ahead of Year-End Approval
Company expects to achieve the Max 10’s certification this year. Boeing has completed its final planned 737 Max 10 certification flight test, a milestone the airframer says puts it on track to meet its goal of achieving the type’s regulatory approval before year-end. “With flight testing complete, the programme now shifts to closing the remaining development assurance reviews and system safety assessments, and submitting final deliverables”, the company said to the US Federal Aviation Administration on 28 July. Boeing is working on the 737 Max 10’s certification programme alongside that of the Max 7 – the two variants of the twinjet that have yet to enter service. The manufacturer has said it expects to secure the Max 7’s approval this summer, followed by the Max 10’s clearance sometime this year. It expects to begin delivering both types next year. The final Max 10 certification flight involved an “interiors evaluation to confirm audibility of the lavatory smoke detector and cabin speaker system”, Boeing says. The jet took off and returned to King County International airport – Boeing Field. The company used three Max 10s for the type’s flight-test programme, logging some 2,060 flight hours. Those flights let Boeing evaluate two design changes : an updated engine anti-ice system and an “enhanced” angle of attack (AoA) system. Boeing redesigned the anti-ice system to prevent a problem involving engine inlet inner barrels overheating in some circumstances. It added "turbulators" on the forward fan cases ahead of the Max's twin CFM International Leap-1B engines. Those devices make air entering the engine swirl, drawing in cooler air and reducing temperatures, Boeing vice-president of 737 development Chris Payne said on 8 July. The enhanced AoA is intended to keep pilots from facing information overload in cases where one of the Max’s two AoA sensors fail – a factor contributing to two 737 Max crashes in 2018 and 2019. The new AoA system simplifies "flight deck effects" by identifying AoA faults, inhibiting stick shake and displaying a simple message to pilots: "AoA Fault", Payne said. All Max models, including aircraft in service, will eventually have both updates.