Boeing Nears Approval of Critical 737 MAX Anti-Ice Fix

Boeing says it is in the final stages of securing regulatory approval for a redesigned engine anti-ice system, clearing a major obstacle in the certification of the long-delayed 737 MAX 7 and MAX 10.




The redesigned system addresses a safety concern involving possible overheating inside the engine nacelle. Under certain conditions, prolonged use of the engine anti-ice system could generate excessive heat, potentially damaging components and creating a risk of engine failure.




Approval of the redesign would move Boeing significantly closer to delivering the smallest and largest members of the 737 MAX family, neither of which has yet entered commercial service.




A Major Certification Roadblock



The anti-ice issue has been one of the largest technical barriers holding up certification of both aircraft.




Boeing previously requested a temporary regulatory exemption that would have allowed the MAX 7 to enter service before a permanent fix was available. The company withdrew that request in early 2024 and committed to incorporating a complete engineering solution into the aircraft before certification.




Company executives now say the redesigned system is nearing approval after years of engineering work and regulatory testing.




The United States and European aviation regulators have both been reviewing the changes as part of their respective certification programs. The Federal Aviation Administration has said it expects the MAX 7 to be certified during summer 2026, while the MAX 10 is expected to follow before the end of the year.




How the Redesigned System Works



Engine anti-ice systems use hot air to prevent ice from building up around the engine inlet during flight through icing conditions.




The concern affecting the MAX family involved excessive heat when the system remained activated in dry air after the aircraft had left icing conditions. Boeing's redesign is intended to prevent dangerous temperatures from developing while maintaining the system's ability to protect the engine from ice.




According to Boeing executives, the updated design also reduces engine noise and fan flutter. The company plans to install the redesigned equipment on newly produced MAX aircraft and retrofit MAX 8 and MAX 9 aircraft already in service during normal maintenance visits.




That approach could limit disruption for airlines by allowing much of the work to be completed during scheduled maintenance rather than requiring lengthy aircraft groundings.




MAX 7 Could Be Approved First



The 737 MAX 7 is the smallest member of Boeing's current narrowbody family and is expected to be the first of the two delayed variants to receive certification.




Southwest Airlines is the largest customer for the aircraft and has built much of its fleet strategy around the smaller MAX model. Southwest has previously indicated that it expects to begin operating the MAX 7 during the first quarter of 2027, assuming certification is completed on schedule.




Boeing has already manufactured approximately 30 MAX 7 aircraft that are awaiting certification and delivery, according to data cited by Reuters.




The aircraft is designed to replace older Boeing 737-700s while offering improved fuel efficiency, range and passenger capacity.




MAX 10 Certification Also Moving Forward



The 737 MAX 10 is the largest aircraft in the MAX family and has attracted orders from airlines seeking additional capacity without moving to a widebody aircraft.




Boeing executives say the MAX 10 has completed approximately 98 percent of its certification flight testing. The aircraft accounts for at least 28 percent of Boeing's outstanding 737 MAX orders, making its approval especially important to the manufacturer's future delivery schedule.




United Airlines, Delta Air Lines, Ryanair and WestJet are among the customers awaiting the aircraft.




The MAX 10 certification program also includes regulatory review of a new flight-crew alerting system intended to satisfy modern cockpit safety requirements.




Years of Delays



Boeing originally expected both variants to enter service several years ago, but certification has repeatedly slipped because of engineering changes and increased regulatory scrutiny.




Oversight of Boeing intensified following the fatal crashes of Lion Air Flight 610 in 2018 and Ethiopian Airlines Flight 302 in 2019, which led to a worldwide grounding of the MAX family.




Further scrutiny followed the January 2024 door-plug failure aboard an Alaska Airlines MAX 9, prompting additional FAA oversight of Boeing's manufacturing and quality-control processes. The FAA has maintained increased monitoring of Boeing and has required the company to demonstrate that corrective actions fully address identified quality concerns.




That means final approval of the anti-ice fix will not automatically place the MAX 7 or MAX 10 into airline service. Each aircraft must still complete the remaining certification work and receive formal authorization from regulators.




A Critical Moment for Boeing



Certification of the MAX 7 and MAX 10 would allow Boeing to offer a more complete family of narrowbody aircraft against Airbus and its popular A320neo series.




The smaller MAX 7 is aimed primarily at airlines needing additional range and efficiency on lower-demand routes. The larger MAX 10 competes more directly with the Airbus A321neo in the high-capacity single-aisle market.




With dozens of completed aircraft already waiting for delivery and hundreds more on order, approval of the redesigned anti-ice system would represent an important step toward clearing Boeing's certification backlog.




For now, however, the aircraft remain on the regulatory taxiway. The finish line is visible, but the FAA has not yet turned on the green light.




Sky Blue Radio will continue following the certification process and any announcements regarding the first MAX 7 and MAX 10 deliveries.



via: https://news.skyblueradio.com/2026/07/16/boeing-nears-approval-of-critical-737-max-anti-ice-fix/