Rolls-Royce is to modify the lift fan systems on already-delivered Lockheed Martin F-35Bs to incorporate changes from flight testing and bring the aircraft up to the configuration required to achieve initial operational capability (IOC) with the U.S. Marine Corps in 2015. The biggest change is new inlet guide vanes (IGV) on the shaft-driven lift fan to remove low-temperature operating limitations, says Tom Hartmann, senior vice president for U.S. government programs. Overall, he ...

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