61-121 - Airport Approach District

LAST AMENDED
12/15/1961


The Airport Approach District comprises those parts of the #flight obstruction area# of any major airport which lie generally below the flight path of aircraft approaching or taking off from the runways of
such airport, and, more specifically, below the following #airport referenced imaginary surfaces#: the #approach surfaces#, the #transitional surfaces# and those parts of the #horizontal surface# and the
#conical surface# which coincide with such #approach surfaces# and #transitional surfaces#.