Experienced pilots with no prior air-to-surface training practiced a 30 degree dive bombing task in the T-37 cockpit of the Advanced Simulator for Pilot Training (ASPT) located at the Air Force Human Resources Laboratory, Flying Training Division, Williams AFB, Arizona. Use of a bomb impact predictor cue by one group of subjects produced no better performance than that of a second group which practiced without the cue. Abrupt removal of the cue, which during training was not made contingent upon performance, produced a significant disruption of performance on the bombing task, both in terms of accuracy and in terms of variability of performance. Best performance was obtained by a third group for which the gunsight itself was initially withheld in training. The results are discussed in terms of the need in future systems for more active control over the stimuli controlling flying performance as well as the need for research into strategies for making changes in the pilots environment contingent upon performance.