Abstract : The problem of precipitation static is becoming increasingly severe with present-day high-speed aircraft. The use of large transparent plastic surfaces with various antenna mounted under the plastic surface accentuates the problem. A B-45A type aircraft was instrumented to measure the electrostatic condition of the aircraft and the canopies in flight. Eleven flights have been made through atmospheric conditions varying from clear air to high-altitude snow and ice cyrstals at temperatures of -20 to -40 C. Tentative conclusions reached are that precipitation static generated on the canopy is serious. Instrumentation problems for research on electrification of canopies have been resolved, and quantitative evaluation of surface treatments to reduce canopy precipitation static may now be accomplished. The electrostatic characteristics of the aircraft as a whole have been determined over a very limited range of magnitudes.