Boeing 737-10 Advances Through FAA Crosswind Certification

The Boeing Company is advancing the Boeing 737-10 through critical extreme wind and crosswind certification testing to validate the aircraft’s aerodynamic profile and flight control responsiveness. The testing campaign, conducted at locations including Edwards Air Force Base in California and Boeing Field in Seattle, Washington, is a mandatory phase of the Federal Aviation Administration (FAA) certification process extending through 2026.

As the largest and final variant of the 737 MAX family, the 737-10 features a lengthened fuselage and a redesigned main landing gear. These structural differences make crosswind, tail-strike, and extreme weather evaluations essential to ensure the aircraft meets safe operational limits before entering commercial airline service. Internal footage recently highlighted on the Boeing News Network demonstrated the aircraft operating under severe wind conditions.

Certification fleet and testing milestones

Boeing officially initiated certification flight testing for the 737-10 in November 2023. The Manufacturers dedicated three test aircraft, designated 1G001, 1G002, and 1G003, to the certification fleet. By early 2025, these aircraft had accumulated more than 1,200 flight hours across over 500 flights.

In January 2026, the FAA granted approval for Phase 2 of the Type Inspection Authorization (TIA). This regulatory clearance allowed Boeing to expand testing parameters, focusing on the aircraft’s avionics, propulsion, and other critical systems.

Alongside the extreme wind evaluations, Boeing completed maximum brake energy (MBE) certification testing in April and May 2026 at Edwards Air Force Base. During the MBE tests, the 737-10 was loaded to its maximum takeoff weight of 197,900 pounds and brought to a complete stop from speeds exceeding 200 mph using worn brakes.

Aerodynamic validation and regulatory timeline

Crosswind testing is a standard requirement for transport category aircraft, but it carries specific weight for the 737-10. The extended fuselage increases the risk of a tail strike during high-angle-of-attack maneuvers, such as takeoff and landing in turbulent or crosswind conditions. The redesigned main landing gear must also be validated under these lateral load conditions.

During extreme weather testing, engineers load the aircraft to its 197,900-pound maximum takeoff weight to observe structural integrity and handling characteristics at the edges of the operating envelope. The data collected during these flights is submitted directly to the FAA to establish the crosswind limits that will be published in the aircraft’s flight manual.

AirPro News analysis

We view the progression into extreme weather and Phase 2 TIA testing as a necessary technical hurdle for Boeing, though the timeline for the 737-10 remains subject to intense regulatory scrutiny. The manufacturer is targeting late 2026 or 2027 for commercial service entry. However, unresolved engineering challenges, including an engine anti-ice system issue, continue to influence the certification schedule. The successful completion of the maximum brake energy tests and the ongoing crosswind evaluations indicate that the physical flight test campaign is maturing, even as administrative and system-level regulatory reviews proceed.

Sources: Boeing News Network