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PRELIMINARY MEASUREMENTS

Several anthropometric dimensions were measured on all subjects.  Click on ANTHROPOMETRY for descriptions of these body dimensions. These, and some additional reach-related measurements, were made on smaller subjects.  All measurements were made on semi nude subjects to standardize results. They were made before proceeding with measurements of cockpit accommodation.

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Early in the development of these procedures, it was discovered that, in any given aircraft model, especially older ones, ejection seats do not necessarily adjust to the same full-up or full-down position relative to the rest of the cockpit.  Apparently, as maintenance is performed on the seat, there are adjustments that can be made that affect where the seat stops on the rails.  After taking seat/cockpit measurements on 12 T-38A aircraft, it was discovered that up to one inch of variability existed in the relationship between the seat and the canopy.  Pilots, then, with large Sitting Heights might strike their heads on the canopy with the seat full-down in some aircraft, but not others of the same model.  For pilots with small Eye Height Sitting values, vision over the nose would be better in some aircraft than others.  To ensure against the inadvertent use of a "worst case" cockpit to establish accommodation limits, selected measurements should be taken in a number of aircraft of the same model.  A data form for taking cockpit geometry dimensions can be found in the Appendix.

Each of the following sections begins with a statement of Purpose and a Discussion to provide background information for the Procedure section.  An Analysis and Results section frequently includes selected accommodation values obtained by the investigators on USAF aircraft.
 

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