This article summarizes reporting by Reuters and journalists Dan Catchpole and David Shepardson.

Boeing 737 MAX 10 Cleared for Critical Phase 2 Certification Testing

The Federal Aviation Administration (FAA) has granted authorization for the Boeing 737 MAX 10 to enter the second phase of its flight testing program, marking a significant regulatory step for the largest variant of the manufacturer’s narrowbody jet. According to reporting by Reuters, this approval moves the aircraft from internal company trials to formal, regulator-supervised testing.

This development represents a pivotal moment for the delayed program, which is essential to Boeing’s strategy in the high-capacity single-aisle market. While the authorization signals technical maturity in key systems, the aircraft still faces a timeline extending into late 2026 or 2027 due to outstanding engineering hurdles, specifically regarding the engine anti-ice system.

Moving to “Type Inspection Authorization”

The transition to Phase 2, known technically as Type Inspection Authorization (TIA), is a major gate in the certification process. According to sources cited by Reuters, the FAA approved this move recently, allowing FAA personnel to board the aircraft for official evaluation.

During Phase 1, flight tests are conducted primarily by the manufacturer to gather preliminary data. Phase 2 shifts the responsibility to FAA pilots and engineers, who validate safety-critical systems such as avionics, structural integrity, and handling qualities. Data collected during these flights contributes directly to the final certification credit required for the aircraft to enter commercial service.

Market reaction to the progress was positive. Following the public emergence of the news on January 9, 2026, Boeing shares (NYSE: BA) rose nearly 3%, reflecting investor optimism that the program is stabilizing.

Commercial Momentum and Backlog

The certification progress coincides with renewed commercial interest in the MAX 10. Just days prior to the certification news, Alaska Airlines finalized a record order for 105 MAX 10 jets, underscoring the industry’s demand for the airframe despite its prolonged gestation.

The MAX 10 is critical for Boeing as it competes directly with the Airbus A321neo, which currently dominates the high-capacity narrowbody segment. Boeing holds a backlog of over 1,200 orders for the MAX 10 from major carriers including United Airlines, Delta, Ryanair, and Alaska Airlines. These airlines have been forced to adjust fleet plans repeatedly as the certification timeline has slipped from original estimates.

Remaining Hurdles: The Anti-Ice System

Despite the TIA milestone, the MAX 10 is not expected to enter service immediately. The primary obstacle remains a required redesign of the engine anti-ice system. In specific dry air conditions, the current system can cause overheating in the engine inlet’s composite structure, posing a potential safety risk.

Boeing has developed a permanent fix for this issue, but the solution itself must undergo certification and implementation. This engineering work is a primary driver behind the projected entry-into-service window of late 2026 or 2027. Additionally, the aircraft must meet updated requirements for pilot alerting systems, a mandate strengthened by Congress and the FAA following historical safety incidents.

AirPro News Analysis

We view the entry into Phase 2 testing as a necessary “proof of life” for the MAX 10 program, but not a finish line. The gap between TIA approval and final certification is typically 12 to 18 months, particularly given the FAA’s current “safety first” regulatory posture. The regulator has capped Boeing’s production rates to ensure quality control, meaning that even once certified, the ramp-up in deliveries will likely be gradual.

For airlines like United and Alaska, this progress validates their decision to stick with the MAX 10 rather than defecting entirely to Airbus, whose A321neo production lines are already sold out for years. However, the 2027 timeline means carriers will continue to face capacity constraints in the near term.

Frequently Asked Questions

What is the difference between Phase 1 and Phase 2 testing?
Phase 1 is manufacturer-led, where Boeing collects data to prove the aircraft is ready. Phase 2 is regulator-led, where FAA pilots conduct the testing to validate that data for certification.

When will the 737 MAX 10 carry passengers?
Current projections estimate entry into service in late 2026 or early 2027, pending the certification of the engine anti-ice fix and final FAA approval.

Why is the MAX 10 important?
It is Boeing’s largest narrowbody jet, designed to carry more passengers and compete with the popular Airbus A321neo. It allows airlines to lower the cost per seat on busy routes.

Sources

• Reuters