Boeing has stopped test flights of its 777X aircraft after discovering a problem with a key structural component. This part, which connects the engine to the aircraft, showed signs of damage during routine maintenance. Boeing immediately grounded all four of its 777X test aircraft, including the 777-9 models, to address the issue.
Boeing’s decision to pause test flights raises questions about the potential impact on the certification and delivery schedule for the 777X. The company originally planned to have these widebody jets certified and delivered by late 2025. It remains uncertain whether this timeline will change due to the grounding.
The flight testing campaign for the 777X began in July 2024 after the Federal Aviation Administration (FAA) granted the Type Inspection Authorization (TIA). Boeing had been moving forward with certification flight testing until the issue was discovered.
Boeing’s Response and Next Steps
A Boeing representative confirmed that the company has been thoroughly inspecting its test fleet for similar issues. They emphasized that no additional test flights were planned soon, as the other 777X aircraft are undergoing scheduled maintenance and other activities. The company has kept the FAA informed and shared details with its customers.
The spokesperson also explained that each engine on the 777X has two of these critical components, providing some redundancy. The part in question is custom-made for the 777-9 model. The problem was first detected on the WH003 aircraft, which Boeing uses for testing handling, avionics, and propulsion.
The 777X Program’s Progress and Orders
Since its launch in November 2013, Boeing’s 777X program has attracted over 500 orders. The most recent order came from Korean Air, which purchased 20 units of the 777-9 variant during the Farnborough Airshow. The 777-9 model can seat up to 426 passengers in a typical two-class configuration. The aircraft bridges the gap between the Boeing 777-300ER and the Boeing 747.
Boeing continues to work on the certification process, which officially started in July 2024. The company remains focused on resolving the current issue to continue moving forward with the 777X program.
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