Boeing has been advised by General Electric that delivery of new engines for the aircraft has been delayed till early next year.
It was understood that the new engines would be delivered later this year.
The GE engines have been impacted by durability issues and according to Aviation Week's Guy Norris "an anomaly was detected in the forward part of the 11-stage high-pressure compressor on a GE9X that was undergoing one of the final batches of certification tests."
SEE Boeing releases first video of 777X taxi tests
In an earnings call with analysts, Boeing CEO Dennis Muilenburg said the engine remained the "pacing item" as the aircraft moved towards first flight.
"As we previously mentioned, GE, our engine supplier is working through some challenges with the engine that are putting risk on the overall test schedule.
"Based on GE's latest assessment on what it will take to address these challenges, we are currently projecting that first flight will occur in early 2020 rather than in 2019 as we have previously mentioned.
"This scheduled flight is obviously disappointing given how well the aircraft has been performing in preflight tests and that we are on track on non-engine activities."
Muilenburg said the first two flight test aircraft were performing well in preflight testing, withe the intermediate gauntlet and initial taxi tests completed during the quarter.
He said Boeing's teams were currently focused on final systems, propulsion, and aircraft level tests.
"We continue to expect 777 delivery rates to be approximately 3.5 aircraft per month in 2019,'' he said.
"Given the pressure around 777X first delivery timeline, we are reassessing the 2020 skyline.
"In light of the strong demand for our freighter line, we intend to mitigate some of the impact by producing more 777 current-generation freighters in 2020."
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