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Pilot/Controller Glossary 

12/2/21 

c. 

180 degrees Autorotation. Initiated from a 

downwind heading and is commenced well inside the 
normal traffic pattern. “Go around” may not be 
possible during the latter part of this maneuver. 

AVAILABLE LANDING DISTANCE (ALD)

 The 

portion of a runway available for landing and roll-out 
for aircraft cleared for LAHSO. This distance is 
measured from the landing threshold to the 
hold-short point. 

AVIATION WATCH NOTIFICATION MESSAGE

 

The Storm Prediction Center (SPC) issues Aviation 
Watch Notification Messages (SAW) to provide an 
area threat alert for the aviation meteorology 
community to forecast organized severe thunder-
storms that may produce tornadoes, large hail, and/or 

convective damaging winds as indicated in Public 
Watch Notification Messages within the Continental 
U.S. A SAW message provides a description of the 
type of watch issued by SPC, a valid time, an 
approximation of the area in a watch, and primary 
hazard(s). 

AVIATION WEATHER SERVICE

 A service 

provided by the National Weather Service (NWS) and 
FAA which collects and disseminates pertinent 
weather information for pilots, aircraft operators, and 
ATC. Available aviation weather reports and 
forecasts are displayed at each NWS office and FAA 
FSS. 

(See TRANSCRIBED WEATHER BROADCAST.) 
(See WEATHER ADVISORY.) 
(Refer to AIM.) 

PCG A

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