GE9XIn February 2012, GE announced studies on a more efficient derivative, dubbed the GE9X, to power the new aircraft. Main article:GE Aviation has also set up a cooperative venture with, named, under which the companies have developed an engine for the, called the, based on an 0.72 flow scale of the GE90-110B/115B core. The Airworthiness Directive requires compliance by taking remedial measures within five days of receipt of the AD. If the fan is removed from the core, then the engines may be shipped on a.The GE90-equipped Boeing 777s have been the best-selling long-range large wide-body aircraft in the 2000s, at the expense of the four-engine that is less fuel efficient.The -94B for the -200ER is being retrofitted with some of the first FAA-approved components.It has an in-flight shutdown rate (IFSD) of one per million engine flight-hours. British Airways soon replaced the GE90 with Rolls-Royce engines on their 777s.GE90 engines can only be air freighted in assembled form by outsize cargo aircraft such as the, presenting unique problems if, due to emergency diversions, a 777 were stranded in a place without the proper spare parts.
In addition the GE90's increased output was not yet put to use by airlines and it was also the heaviest engine option, making it the least popular choice while Rolls-Royce held the top spot.
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British Airways' aircraft returned to full service later that year.Problems with GE90 development and testing caused delays in certification.
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