Boeing has resumed the flight test program for the 777X, which was grounded owing to a problem detected during planned maintenance.
Back in the skies
On January 16, Boeing resumed flying tests for the 777X. The airplane, registered N779XY, took off from King County International Airport (BFI, also known as Boeing Field) at 14:12 local time (UTC -8). After flying over Washington State and briefly crossing into Oregon, the aircraft, also known as WH003, returned to King County/Boeing Field at 16:18 local time.
The flight corroborated prior reports that Boeing would resume the type’s flight test program, with AviationWeek being the first to report on the development. The manufacturer halted flights with the four 777-9 airframes after detecting disconnected propulsion linkages on N779XY and, thereafter, all four test aircraft.
The flight marked the first time any of the 777-9 aircraft had flown since September 2024, when Boeing promptly ceased flying with the type after discovering a problem with the thrust linkages. On September 8, 2024, N779XY returned from Hawaii, where it had performed several test flights while stationed at Kona International Airport.
Positive sign
While 2024 began with Boeing in hot water due to a mid-air door plug blowout on an Alaska Airlines flight in January 2024 and the subsequent backlash, the business has had no difficulties associated with its name thus far in 2025.
2025 will be a recovery year for the jet manufacturer, as it not only hopes to move past the door plug incident, the 52-day machinists strike, and the ensuing low delivery numbers, but also to keep its commitments to consumers.
This involves certification for three commercial aircraft programs: the 737 MAX 7, the 737 MAX 10, and the 777X. Boeing has not offered an update on the latter two, but previously stated that the 777X will begin commercial service in 2026, following another delay that pushed back the type’s entry-into-service (EIS) date from the original 2020 deadline.
Boeing’s now-former President and Chief Executive Officer (CEO), David Calhoun, stated on his last earnings call on July 31, 2024, that the company had identified an engineering solution for the engine anti-ice (EAI) system, which had hampered the certification of the 737 MAX 7 and 737 MAX 10.
Calhoun stated that the revised system will be introduced in 2025, allowing Boeing to certify and deliver the 737 MAX 7 and 737 MAX 10.
Identified during scheduled maintenance
Boeing noticed the problem with the severed propulsion linkages in August 2024, when a company spokeswoman told Simple Flying that it was detected during planned maintenance.
Boeing quickly terminated the flight testing campaign after learning that the severed thrust linkages were not performing as intended. Furthermore, its engineers replaced the part and learned from the nonconforming part.
The thrust links are a structural component that connects the engine to the aircraft’s structure. The part is unique to the 777-9. Each 777-9 has two thrust linkages, thus there is redundancy.
FAQ
What is the Boeing 777X, and why is its test flight important?
The Boeing 777X is the latest and most advanced version of Boeing’s 777 series of aircraft. Its successful test flight is important because it marks a significant milestone in its certification process, ensuring its safety and performance before entering commercial service.
What are the key features of the Boeing 777X?
The Boeing 777X features larger and more fuel-efficient engines, longer wings with folding wingtips, and improved aerodynamics for greater efficiency. It also boasts advanced technology to enhance passenger comfort and operational performance.
What were the results of the Boeing 777X test flight?
The test flight was deemed successful, with the aircraft meeting its performance benchmarks. The flight provided crucial data for further evaluation and certification, bringing it closer to commercial launch.
When is the Boeing 777X expected to enter commercial service?
The Boeing 777X is expected to enter commercial service in 2025 after completing its final testing and certification processes. The aircraft will be delivered to airlines in phases, starting with major carriers such as Emirates and Lufthansa.
How does the Boeing 777X compare to other aircraft in its class?
The Boeing 777X is one of the most advanced wide-body aircraft in its class. It offers improved fuel efficiency, more capacity, and a longer range compared to previous models like the 777-200LR and the 787 Dreamliner, making it ideal for long-haul flights with fewer emissions and greater comfort for passengers.
