STEPDOWN FIX A fix permitting additional descent while on a segment of an instrument
approach. The fix identifies a point at which a controlling obstacle has been safely overflown.
STOP AND GO A procedure wherein an aircraft will land, make a complete stop on the
runway, and then commence a takeoff from that point.
STRAIGHTIN APPROACH IFR An instrument approach wherein final approach is
begun without first having executed a Procedure Turn. This type of approach is not necessarily
completed with a straightin landing or made to straightin landing minimums.
STRAIGHTIN LANDING A landing made on a runway aligned within 30º of the final
approach course following completion of an instrument approach.
TACAN An ultrahigh frequency electronic air navigation aid which provides suitably
equipped aircraft a continuous indication of bearing and distance (slant range) to the TACAN
TRACK The actual flight path of an aircraft over the surface of the earth.
TRANSPONDER The airborne radar beacon receiver/transmitter portion of the Air Traffic
Control Radar Beacon System which automatically receives radio signals from ground
interrogators and selectively replies.
VICTOR AIRWAYS A route system established in the form of a corridor on controlled
airspace. The routes are predicated solely on VOR/VORTAC NAVAIDS. Victor airways
include airspace at least 1200 feet above the surface (sometimes higher) up to but not including
18,000 feet MSL.
VISUAL DESCENT POINT (VDP) A defined point on the final approach course of a Non-
precision Straightin Approach Procedure, normally defined by DME, from which normal
descent from the MDA to the runway touchdown point may be commenced, provided the
runway environment is in sight and a safe landing can be accomplished.