Browse Standards AIR902A
Current REVISED 2017-09-19

Determination of Distance from Ground Observer to Aircraft for Acoustic Tests AIR902A

This document describes a practical system for a user to determine observer-to-aircraft distances. These observer-to-aircraft distances can be either closest point of approach (CPA) distances during field measurements or overhead distances during acoustic certification tests. The system uses a digital camera to record an image of the subject aircraft. A method of using commercial software to obtain the distance from such an image is presented. Potential issues which may affect accuracy are discussed.
AIR902A
2017-09-19
Latest
Revised
AIR902
2007-11-06
Historical
Reaffirmed

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