NEW UPDATE: The Federal Aviation Administration has approved Boeing to proceed with TIA Phase 4B certification testing for the 777X, unlocking the largest remaining portion of flight test work needed for type certification.
According to Boeing Commercial Airplanes CEO Stephanie Pope, the authorization enables expanded testing in avionics, stability and control, and human factors—key final areas before certification.
Pope noted this is the last major TIA phase, though not yet complete, with the FAA still requiring extensive additional test points before type certification is issued.
The 777-9 campaign, now years behind schedule, has been slowed by multiple technical issues and heightened FAA scrutiny following the 737 MAX crisis, with certification now targeted for next year at the earliest.
The Federal Aviation Administration has cleared Boeing to move the 777-9 into Phase 4A of certification testing.
This marks a major step forward, with more systems now ready for real-world air & ground evaluations.
Next up: Phase 4B → Phase 5 → ETOPS & reliability trials before delivery.