Boeing advances 737 Max and 777-9 programs with key system redesigns and production ramp-up

Boeing is accelerating progress on its commercial aircraft programs with several critical developments. The manufacturer is close to securing certification for the delayed 737 Max 7 and aims to follow with Boeing 737 Max 10 approval later this year. Alongside these milestones, Boeing recently inaugurated a new 737 production line in Everett to increase output, and is advancing certification work for its 777-9, targeting initial deliveries in 2027. Senior Boeing executives detail efforts to enhance aircraft systems and escalate production pace, signaling a strong push ahead of the Farnborough Airshow.

The 737 Max 7 is nearing completion of its certification activities, with Boeing stating that all flight tests and 95% of certification deliverables requested by the Federal Aviation Administration (FAA) are finalized. The company anticipates the FAA will grant approval imminently, possibly this summer. This variant's certification marks a vital step to expand Boeing's single-aisle market penetration, especially as it faces stiff competition and seeks to close the gap on long-delayed certification.

A major focus has been the redesign of the 737 Max's engine anti-ice system, required after findings showed the existing design could cause excessive heating in engine inlet components. Boeing's redesign installs 'turbulators'—small washers and fasteners circumferentially mounted on the engine’s forward fan case—that create swirl in incoming air, effectively lowering temperatures by approximately 93°C at critical points. This modification also replaces the existing perforated fan case with a solid hard-walled case to reduce noise and maintain required aerodynamic margins.

Additional anti-ice system improvements include a new flow restrictor to limit hot air impingement on vital components, insulation for inlet ducts and wiring, circuit breakers, a redundant pressure switch for fault detection, and an integrated controller managing the anti-ice valve. Boeing has completed exhaustive certification testing—including lab simulations and flight trials—and submitted nearly all documentation to the FAA, signaling the final phases of certification for this system upgrade.

For the 737 Max 10, approximately 98% of flight testing is complete, with just two tests remaining to meet certification requirements. Boeing is also implementing an 'enhanced angle-of-attack (AoA)' system informed by lessons from previous Max 8 accidents. This improved AoA system detects faulty sensor readings more reliably, suppresses inappropriate stick-shaker warnings, and displays a clear 'AoA Fault' message to the cockpit, reducing pilot confusion and workload in the event of sensor anomalies.

Pilot control can override the system’s stick shaker activation through a dedicated switch, adding a layer of pilot authority should the system err. Boeing plans to introduce this enhanced AoA system on all Max 10 deliveries and retrofit existing in-service aircraft over the following two years through streamlined upgrade procedures designed to minimize aircraft downtime.

Parallel to single-aisle advances, Boeing is making steady progress on the long-delayed 777-9 widebody. Half of the certification flight tests are complete, and the two test aircraft have been brought to final certification configurations after multiple iterative updates. The FAA is processing the 777-9’s Type Inspection Authorization approval in stages, a departure from the usual comprehensive approval approach, allowing Boeing to align final test flights with regulatory milestones.

Once certification is achieved, Boeing plans to concentrate on attaining 180-minute ETOPS (Extended Twin Operations) approval for the 777-9, enabling long overwater and remote route operations. There is potential for seeking even longer ETOPS approval after initial service entry, which is slated for 2027. This marks a critical phase for the 777-9, a program that has faced significant delays but remains integral to Boeing’s widebody portfolio.

Boeing's recent production enhancements include opening a new 737 Max assembly line in Everett, utilizing hangar space formerly dedicated to 787 production. This expansion boosts 737 output from 47 to 52 aircraft per month, with plans for further rate increases. The new line primarily supports the 737 Max 10 variant and underscores Boeing's commitment to ramping up supply to meet strong market demand and regain momentum in its narrowbody offerings.