A number of minor problems surfaced, but were readily fixed. The yaw damper of the XF-104 was found to be ineffective and the rudder did not positively center; these problems were corrected by revising the rudder control system.Pace 1992, p. 20. The unpowered rudder did not provide adequate directional control at high air speeds, which problem was fixed by using hydraulic power on all subsequent versions of the F-104; and some concern was expressed over poor subsonic maneuverability at higher altitudes.Pace 1992, p. 20.
