Calibrations of two static-pressure systems were determined by a low-level flyover method, in which a ground-based camera was used, and by a high-altitude method based on pressure-altitude surveys of the atmosphere, in which a ground-based radar was used. The test airplane was a large turbojet transport. The static-pressure systems for which the calibrations were determined were a fuse¬lage vent system and a boom-mounted pitot-static tube installed above and forward of the pilot's compartment. The calibration of the pitot-static tube showed that the position of the tube of this installation was unsatisfactory for the measure¬ment of static pressure because the errors at both sea level and 25,000 feet were large and because the variation of the error with Mach number was also large.
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