GE: No water injection system required for GE9X

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General Electric denies that the proposed GE9X turbofan will require a special water injection system to power the Boeing 777X in hot environments, such as Dubai.

“There are no plans for this with the GE9X,” says Bill Millhaem, GE9X programme manager.

GE’s statement appears to clash with a claim made by one of the 777X programme’s most important sales targets.

Emirates chief executive Tim Clark, who is the largest single customer of the 777 family in the world, told Flightglobal last week that the GE9X would be unable to operate in very hot environments such as Dubai without a water injection system.

Whereas most water injection applications for aerospace applications are required for very quick starts, the GE9X engine would require it as an additional cooling system, Clark said.

Boeing declined to comment specifically on the need for a water injection system for the GE9X, saying only that it remains premature to discuss specific technologies in detail.

The 777X is expected to be launched by Boeing later this year, perhaps at the Dubai Air Show. It includes the 400-seat class 777-9X and the 350-seat class 777-8X.

Boeing selected the 100,000lb-thrust-class GE9X earlier this year as the sole propulsion option for the 777X family.