9/5/24 

Pilot/Controller Glossary 

a. 

Autorotative Landing/Touchdown Autorotation. Used by a pilot to indicate that the landing will be made 

without applying power to the rotor. 

b. 

Low Level Autorotation. Commences at an altitude well below the traffic pattern, usually below 100 feet 

AGL and is used primarily for tactical military training. 

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)

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 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

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 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 thunderstorms 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

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 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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