Pilot/Controller Glossary  8/15/19  information at airports without operating control  towers.  (Refer to AIM.)  SEGMENTS OF AN INSTRUMENT APPROACH  PROCEDURE- An instrument approach procedure  may have as many as four separate segments  depending on how the approach procedure is  structured.  a.  Initial Approach- The segment between the  initial approach fix and the intermediate fix or the  point where the aircraft is established on the  intermediate course or final approach course.  (See ICAO term INITIAL APPROACH  SEGMENT.)  b.  Intermediate Approach- The segment between  the intermediate fix or point and the final approach  fix.  (See ICAO term INTERMEDIATE APPROACH  SEGMENT.)  c.  Final Approach- The segment between the final  approach fix or point and the runway, airport, or  missed approach point.  (See ICAO term FINAL APPROACH SEGMENT.)  d.  Missed Approach- The segment between the  missed approach point or the point of arrival at  decision height and the missed approach fix at the  prescribed altitude.  (Refer to 14 CFR Part 97.)  (See ICAO term MISSED APPROACH  PROCEDURE.)  SEPARATION- In air traffic control, the spacing of  aircraft to achieve their safe and orderly movement in  flight and while landing and taking off.  (See SEPARATION MINIMA.)  (See ICAO term SEPARATION.)  SEPARATION [ICAO]- Spacing between aircraft,  levels or tracks.  SEPARATION MINIMA- The minimum longitudi- nal, lateral, or vertical distances by which aircraft are  spaced through the application of air traffic control  procedures.  (See SEPARATION.)  SERVICE- A generic term that designates functions  or assistance available from or rendered by air traffic  control. For example, Class C service would denote  the ATC services provided within a Class C airspace  area.  SEVERE WEATHER AVOIDANCE PLAN  (SWAP)- An approved plan to minimize the affect of  severe weather on traffic flows in impacted terminal  and/or ARTCC areas. A SWAP is normally  implemented to provide the least disruption to the  ATC system when flight through portions of airspace  is difficult or impossible due to severe weather.  SEVERE WEATHER FORECAST ALERTS- Preliminary messages issued in order to alert users  that a Severe Weather Watch Bulletin (WW) is being  issued. These messages define areas of possible  severe thunderstorms or tornado activity. The  messages are unscheduled and issued as required by  the Storm Prediction Center (SPC) at Norman,  Oklahoma.  (See AIRMET.)  (See CONVECTIVE SIGMET.)  (See CWA.)  (See SIGMET.)  SHORT RANGE CLEARANCE- A clearance  issued to a departing IFR flight which authorizes IFR  flight to a specific fix short of the destination while  air traffic control facilities are coordinating and  obtaining the complete clearance.  SHORT TAKEOFF AND LANDING AIRCRAFT  (STOL)- An aircraft which, at some weight within its  approved operating weight, is capable of operating  from a runway in compliance with the applicable  STOL characteristics, airworthiness, operations,  noise, and pollution standards.  (See VERTICAL TAKEOFF AND LANDING  AIRCRAFT.)  SIDESTEP MANEUVER- A visual maneuver  accomplished by a pilot at the completion of an  instrument approach to permit a straight-in landing  on a parallel runway not more than 1,200 feet to either  SFA- SFO- SHF- (See SINGLE FREQUENCY APPROACH.)  (See SIMULATED FLAMEOUT.)  (See SUPER HIGH FREQUENCY.)  SIAP- SID- (See STANDARD INSTRUMENT APPROACH  PROCEDURE.)  (See STANDARD INSTRUMENT DEPARTURE.)  PCG S-3 