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Challenges Boeing Faced After Designing the 737 MAX for Larger Engines

Challenges Boeing Faced After Designing the 737 MAX for Larger Engines
The Boeing 737 has historically been the cornerstone of Boeing’s commercial aircraft portfolio, representing approximately 75% of the company’s commercial order backlog. However, the Airbus A320 family has recently surpassed the 737 in cumulative sales, a shift accelerated by the twin fatal crashes involving the Boeing 737 MAX in 2018 and 2019. Investigations revealed that these tragedies stemmed from the retrofitting of larger engines onto an airframe that was not originally designed to accommodate them, exposing significant engineering and organizational vulnerabilities within Boeing.
Engineering Hurdles: Adapting a 1960s Airframe
The 737’s design dates back to the 1960s, with its maiden flight in 1967 and entry into service the following year. Initially engineered to house the smaller Pratt & Whitney JT8D engines, the aircraft featured a low-slung fuselage that facilitated ground servicing, particularly advantageous for the unpaved runways common at the time. As jet engine technology advanced and engines grew larger, Boeing encountered increasing difficulties in adapting the 737’s original design to these new specifications.
To circumvent the extensive costs and delays associated with a comprehensive redesign of the landing gear and other structural components—which would have necessitated full recertification—Boeing implemented innovative engineering compromises. The 737 Classic and Next Generation models were equipped with larger CFM56 engines, while the 737 MAX incorporated the even larger CFM International LEAP-1B engines. This adaptation resulted in distinctive design modifications, such as the MAX’s flattened engine nacelles, intended to preserve ground clearance.
In contrast, the Airbus A320, developed in the 1980s, was designed from inception to accommodate larger engines. This foresight allowed Airbus to re-engine the A320 family with the LEAP-1A engines more seamlessly, avoiding the compromises that challenged Boeing’s approach.
Organizational Pressures and Cultural Shifts
Beyond technical challenges, Boeing’s organizational culture significantly influenced the development trajectory of the 737 MAX. A 2024 Harvard Business School report and other analyses identify Boeing’s 1997 merger with McDonnell Douglas as a pivotal moment. The merger shifted Boeing’s internal priorities toward cost-cutting and shareholder value, often at the expense of engineering rigor. Decision-making increasingly favored executive management over engineering expertise, contributing to design choices that ultimately compromised the MAX’s safety and reliability.
Production and Certification Challenges
Boeing continues to grapple with production and certification challenges related to the 737 MAX. While airlines such as Emirates have expressed cautious optimism regarding Boeing’s delivery capabilities, the pace of production and regulatory approval timelines remain under close scrutiny. CEO Kelly Ortberg has affirmed the company’s objective to certify all 737 MAX variants by the end of the year, a critical milestone in Boeing’s efforts to restore confidence and stabilize its market position.
Despite these ongoing challenges, Boeing’s delivery figures for April 2025 indicate progress toward its target of 400 737 deliveries for the year. Additionally, Boeing has reached an agreement with U.S. authorities to avoid criminal charges connected to the MAX crashes and recent door plug issues, enabling the company to focus on rebuilding trust in its flagship narrowbody aircraft.
As Boeing navigates both technical and organizational obstacles, the legacy of the 737’s original design continues to influence the company’s future and its standing within the highly competitive commercial aviation industry.

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