4/20/23 

Pilot/Controller Glossary 

ROUTE AMENDMENT DIALOG (RAD)

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 A capability within the Traffic Flow Management System that 

allows traffic management personnel to submit or edit a route amendment for one or more flights. 
ROUTE SEGMENT

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 As used in Air Traffic Control, a part of a route that can be defined by two navigational 

fixes, two NAVAIDs, or a fix and a NAVAID. 

(See FIX.) 
(See ROUTE.) 
(See ICAO term ROUTE SEGMENT.) 

ROUTE SEGMENT [ICAO]

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 A portion of a route to be flown, as defined by two consecutive significant points 

specified in a flight plan. 
RPIC

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(See REMOTE PILOT IN COMMAND.) 

RRIA

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(See REROUTE IMPACT ASSESSMENT.) 

RSA

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(See RUNWAY SAFETY AREA.) 

RTR

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(See REMOTE TRANSMITTER/RECEIVER.) 

RUNWAY

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 A defined rectangular area on a land airport prepared for the landing and takeoff run of aircraft along 

its length. Runways are normally numbered in relation to their magnetic direction rounded off to the nearest 10 

degrees; e.g., Runway 1, Runway 25. 

(See PARALLEL RUNWAYS.) 
(See ICAO term RUNWAY.) 

RUNWAY [ICAO]

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 A defined rectangular area on a land aerodrome prepared for the landing and takeoff of 

aircraft. 
RUNWAY CENTERLINE LIGHTING

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(See AIRPORT LIGHTING.) 

RUNWAY CONDITION CODES (RwyCC)

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 Numerical readings, provided by airport operators, that indicate 

runway surface contamination (for example, slush, ice, rain, etc.). These values range from “1” (poor) to “6” 

(dry) and must be included on the ATIS when the reportable condition is less than 6 in any one or more of the 

three runway zones (touchdown, midpoint, rollout). 
RUNWAY CONDITION READING

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 Numerical decelerometer readings relayed by air traffic controllers at 

USAF and certain civil bases for use by the pilot in determining runway braking action. These readings are 

routinely relayed only to USAF and Air National Guard Aircraft. 

(See BRAKING ACTION.) 

RUNWAY CONDITION REPORT (RwyCR)

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 A data collection worksheet used by airport operators that 

correlates the runway percentage of coverage along with the depth and type of contaminant for the purpose of 

creating a FICON NOTAM. 

(See RUNWAY CONDITION CODES.) 

RUNWAY END IDENTIFIER LIGHTS (REIL)

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(See AIRPORT LIGHTING.) 

RUNWAY ENTRANCE LIGHTS (REL)

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An array of red lights which include the first light at the hold line 

followed by a series of evenly spaced lights to the runway edge aligned with the taxiway centerline, and one 

additional light at the runway centerline in line with the last two lights before the runway edge. 
RUNWAY GRADIENT

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 The average slope, measured in percent, between two ends or points on a runway. 

Runway gradient is depicted on Government aerodrome sketches when total runway gradient exceeds 0.3%. 

PCG R

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