February 16, 2025
Boeing 777X Test Flights Resume After Five-Month Delay

Boeing 777X Test Flights Resume After Five-Month Delay

Boeing has resumed the flight testing and certification program for its highly anticipated 777X aircraft, following its grounding in August 2024.
A Boeing 777 taxis after landing.
Photo Credit: Boeing

Boeing resumed the flight testing and certification program for its highly anticipated 777X aircraft on 16 January 2025. This marks a significant recovery for the program, which has faced numerous delays and setbacks.

The resumption of testing comes after a five-month suspension due to structural issues discovered in August 2024.  

The Grounding and its Cause


The test program was halted when Boeing discovered problems with an engine component. Specifically, the issue involved the thrust link, a crucial component that connects the engine to the aircraft’s frame. The thrust link carries the thrust load safety to the airframe at the engine pylon.

Following a test flight, Boeing discovered one of the aircraft’s engine thrust links was completely severed. Others were found to be cracked on other test aircraft, grounding the fleet. Inspections subsequently revealed cracks in this part on all four 777X test aircraft.  

This discovery forced Boeing to ground its test fleet and work closely with the Federal Aviation Administration (FAA) to address the problem. The US plane manufacturer was reuired to redesign and remanufacture the affected parts, a process that took several months.

The Path Forward


With the resumption of testing, Boeing is now focused on completing the certification process with the FAA. This involves a rigorous series of flight tests to demonstrate the aircraft’s safety, performance, and reliability. Once certification is obtained, Boeing expects to deliver the first 777X to customers in 2026.  

Boeing will be seeking to rebound from what was a horror year in 2024. Boeing’s 2024 performance saw a significant decline in commercial aircraft deliveries. It delivered less than half the number of commercial aircraft achieved by its European rival, Airbus.

This stark contrast highlights the challenges Boeing continues to face in recovering from a series of production and regulatory setbacks.

Several factors contributed to Boeing’s poor performance in 2024:

  • Production Hurdles: The company’s flagship 737 MAX, once a key driver of its commercial success, continued to face production hurdles, hindering delivery numbers.
  • Labor Strikes: A major strike involving over 33,000 unionized workers disrupted production for over seven weeks during the fall, further impacting delivery timelines.
  • Ongoing Challenges: Boeing continues to grapple with the fallout from the 737 MAX crisis, including safety and quality control issues, which have slowed production and impacted its reputation.

In contrast, Airbus delivered a robust 766 aircraft in 2024, solidifying its position as the leading manufacturer of commercial jets.

This significant gap in deliveries highlights the uphill battle Boeing faces to regain its market share and compete effectively with its European rival.

A Boeing 777X test aircraft takes off.
Photo Credits: Boeing

The 777X: A Long-Awaited Contender


The 777X is a highly anticipated aircraft, designed to be the most efficient and technologically advanced widebody jet in the world.

It features a new, fuel-efficient engine and a longer wingspan, allowing it to carry more passengers and cargo over longer distances.  

However, the program has faced numerous challenges, including production delays and safety concerns. The latest setback with the thrust reversers further delayed the program and added to the pressure on Boeing to deliver a safe and reliable aircraft.  

The resumption of testing is a positive sign for the 777X program. However, it is crucial for Boeing to address all outstanding issues and complete the certification process without further delays.

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