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A location in the aircraft, which is identified by a number designating its distance from the datum, is known as:
  • A
    Station.
  • B
    Index.
  • C
    Moment.
  • D
    MAC.

In order to describe the location of equipment in an aircraft, the manufacturer gives its position as a body station number (STA). The Station datum is always "STA.0".

Station positions often state or imply units of measurement. For example, the statement, "all Stations in inches", means that "STA. 200" is 200 inches aft of the station datum.

By convention, the stations forward of the datum are negative and the stations aft of the datum are positive.

NOTE: The Station datum is not always in the same position as the CG datum.

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