The US Department of Defense has awarded a $571m contract to Pratt & Whitney to supply F135 engines for the F-35 Lightning II joint strike fighter aircraft.

The F-35 programme involves the development and production of a fifth generation of stealth fighters that will be delivered to the US Air Force and eight allied countries.

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The low rate initial production contract covers production, sustainment, spare parts and engineering support for the third lot of engines, including ten for conventional take-off and landing and 11 for short-takeoff/vertical-landing F-35s.

In addition, the USAF has awarded $113m for long lead material procurement to produce 32 F135 engines for the fourth lot.

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