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25-4 - Inertial Navigation System (INS) (Cancelled)

Cancellation Notes
AC 20-138C
Date Cancelled
May 08, 2012
Date Issued
February 18, 1966
Responsible Office
ANM-100,  Aircraft Certification Service, Transport Airplane Directorate

Sets forth an acceptable means for complying with rules governing the installation of inertial navigation systems in transport category aircraft.