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12/2/21 

Pilot/Controller Glossary 

information at airports without operating control 
towers. 

(Refer to AIM.) 

SEGMENTS OF A SID/STAR

 

a. 

En Route Transition

  The segment(s) of a 

SID/STAR that connect to/from en route flight. Not 
all SIDs/STARs will contain an en route transition. 

b. 

En Route Transition Waypoint

 The NAVAID/ 

fix/waypoint that defines the beginning of the 
SID/STAR en route transition. 

c. 

Common Route

 The segment(s) of a SID/ 

STAR procedure that provides a single route serving 
an airport/runway or multiple airports/runways. The 
common route may consist of a single point. Not all 
conventional SIDs will contain a common route. 

d. 

Runway Transition

 The segment(s) of a 

SID/STAR between the common route/point and the 
runway(s). Not all SIDs/STARs will contain a 
runway transition. 

e. 

Runway Transition Waypoint (RTW)

 On a 

STAR, the NAVAID/fix/waypoint that defines the 
end of the common route or en route transition and the 
beginning of a runway transition (In the arrival route 
description found on the STAR chart, the last fix of 
the common route and the first fix of the runway 
transition(s)). 

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.) 

SELF

BRIEFING

 A self

briefing is a review, 

using automated tools, of all meteorological and 
aeronautical information that may influence the pilot 
in planning, altering, or canceling a proposed route of 
flight. 

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.) 

PCG S