Testing for Boeing’s highly anticipated 777X widebody jet resumed on December 18, 2024, months after being grounded due to the failure of a key engine mounting structure. The 777-9 test aircraft successfully completed a round-trip flight between Boeing Field in Seattle and Moses Lake, Washington, signaling progress in the program’s rigorous evaluation process and continuation of 777X testing.
The test fleet had been grounded in August 2024, just five weeks after certification flights began with Federal Aviation Administration (FAA) officials on board. Thursday’s flight did not include FAA personnel, as confirmed by Boeing. Despite the absence of regulatory officials, the company emphasized its commitment to ensuring the safety, performance, and reliability of the 777-9, especially as it continues 777X testing.
“We continue to execute a rigorous test program to demonstrate the safety, performance, and reliability of the 777-9,” Boeing stated following the resumption of 777X testing, which landed safely in the afternoon.
Progress Toward Certification
The 777-9, part of the 777X series, is a centerpiece of Boeing’s future widebody offerings. While the recent flight indicates progress, Boeing has faced challenges throughout the program’s development. The suspension of testing earlier this year occurred shortly after certification flights began, highlighting the complexity of addressing the engine mounting issue and demonstrating the importance of continued 777X testing.
Boeing has declined to comment on the aircraft’s performance during the latest flight. However, the company continues to work toward meeting strict regulatory requirements as it moves closer to certification and further 777X testing phases.
The resumption of testing marks a step forward in what has been a lengthy development process for the 777X series. With the goal of delivering a safe and reliable aircraft, Boeing has not provided a definitive timeline for certification or entry into commercial service. The company remains focused on conducting extensive evaluations to address all potential concerns, which involve rigorous 777X testing.
The successful completion of Thursday’s flight offers a glimpse of progress, but more work remains before the 777-9 can officially join Boeing’s fleet of commercial jets.
