SAE AS 397A

SAE AS 397A Direction Instrument, Non-Magnetic, Stabilized Type (Directional Gyro) ( Reaffirmed: Oct 1984 May 1991 Jul 2002 Feb 2008 )
standard by SAE International, 07/15/1958

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This document has been declared NONCURRENT. It is recommended, therefore, that this document not be specified for new designs. NONCURRENT refers to those documents which have previously been widely referenced and may continue to be required on some existing designs.

To specify minimum requirements for non-magnetic gyroscopically stabilized direction indicators for use in aircraft, the operation of which may subject the instruments to the environmental conditions specified in Paragraph 3.3. This Aeronautical Standard covers two basic types as follows: Type I - Air Operated, Type II - Electrically Operated.