Boeing 777-9 Receives FAA TIA Phase 4B Clearance

This article summarizes reporting by Aviation Week by Karen Walker.

The Boeing 777-9 has secured Type Inspection Authorization Phase 4B from the Federal Aviation Administration, clearing the way for agency personnel to directly participate in the aircraft’s final flight testing. Boeing Commercial Airplanes President and CEO Stephanie Pope announced the regulatory milestone on June 6, 2026, during the International Air Transport Association Annual General Meeting in Rio de Janeiro, Brazil.

According to Aviation Week, the approval marks a critical transition for the delayed widebody program. The Phase 4B authorization permits the Federal Aviation Administration (FAA) to evaluate the aircraft’s avionics, human factors, and stability and control systems in flight, shifting the focus from component-level validation to integrated operational assessments.

Advancing through the certification phases

The Type Inspection Authorization (TIA) process consists of five distinct phases. Pope noted that the previous Phase 4A was a smaller step, while Phase 4B represents one of the most substantial remaining hurdles before final certification.

“This authorization unlocks the largest remaining portion of our flight tests with the FAA that we can now go execute,”

Pope stated, as reported by Aviation Week. She added that the testing will now heavily focus on avionics and non-normal operations, allowing the manufacturer to validate checklists and system redundancies alongside regulators.

Timeline discrepancies and delivery targets

The manufacturer and the regulator have offered slightly different timelines for the final certification of the Boeing 777-9. During her June 6 remarks, Pope indicated that Boeing is focused on completing flight tests and achieving certification by the end of 2026.

However, FAA Administrator Bryan Bedford provided a different estimate during the CAPA Americas Airline Leader Summit in late May 2026. Bedford stated that the agency expects to certify the Boeing 737 MAX 7 and Boeing 737 MAX 10 by the end of 2026, with the 777X program following in early 2027. Initial commercial deliveries of the 777-9 are currently projected for early 2027.

AirPro News analysis

The transition to TIA Phase 4B is a definitive signal that the FAA is satisfied with Boeing’s preliminary data and is ready to commit agency resources to in-flight validation. For a program that has faced years of delays, reaching this stage indicates that the aircraft’s core systems are stable enough for direct regulatory scrutiny.

We note that the slight divergence in certification timelines between Boeing and the FAA is standard for this phase of a major aircraft program. The FAA’s projection of early 2027 aligns with the agency’s current rigorous oversight posture, prioritizing thoroughness over manufacturer targets. Even if certification slips into 2027, the early 2027 delivery target remains plausible provided no major anomalies are discovered during the Phase 4B flight tests.

Sources: Aviation Week