Boeing Will Restart 777X Certification Flights

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SEATTLE- Boeing is set to restart certification flights for the 777X after resolving a critical issue with engine thrust links. The return marks a significant milestone following delays caused by mechanical failure and labor strikes in 2024.

The progress of the 777X certification program has been on hold for five months, but Boeing’s latest efforts signal renewed momentum toward achieving certification, now targeted for 2026, reported Aviation Week.

Photo: Boeing

Boeing 777X Certification Flights

Boeing’s 777X certification program faced a setback in mid-August 2024 when thrust link failures were detected during flight testing.

The third test aircraft, WH003 (N779XY), was grounded after the issue was identified during a flight in Kona, Hawaii.

Since then, Boeing has replaced the thrust link components on all four primary test aircraft and conducted additional rework on the thrust reverser assembly.

The certification flights are set to resume with WH003, the program’s lead aircraft since its introduction in 2020. This aircraft, central to propulsion and avionics testing, has not flown since September 2024.

The upcoming functional check flight, expected as early as January 15, 2025, will pave the way for the full resumption of the certification program.

A seven-week labor strike in late 2024 further exacerbated the program’s delays, contributing to Boeing’s decision to push initial deliveries to 2026. Despite these challenges, Boeing remains committed to advancing the 777X, a key part of its long-haul fleet offerings.

Photo: Boeing

Boeing 777X Certification Flights Overview

The 777X certification fleet consists of four aircraft, each contributing to specific aspects of the program:

• WH001: First flown in January 2020, this prototype has primarily conducted stability, control, and aerodynamic testing. It is expected to rejoin the program in the coming weeks.
• WH002: Introduced in April 2020, this aircraft has focused on autoland system validation and ground effects testing.
• WH003: As the lead aircraft, WH003 has been used for propulsion testing, including evaluations of the GE9X engine and auxiliary power systems.
• WH004: Featuring a production-representative cabin, WH004 is tasked with testing extended twin-engine operations and airline functionality.

Boeing’s efforts to address mechanical and procedural challenges highlight its commitment to the 777X’s long-term success.

The upcoming flights represent a critical step in demonstrating the aircraft’s readiness for certification. The program’s progress will be closely monitored as Boeing works toward achieving its revised timeline for deliveries in 2026.

Featured Image by Clément Alloing | Flickr

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