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ADDS
Aviation Digital Data Service
VASI
Visual approach slope indicators provides visual descent guidance during the approach to a runway. The
lights are arranged in bars and vary in number from two to 16.
Airport Advisory Area
An area within 10 statute miles (SM) of an airport where a control tower is not operating, but where a flight service station (FSS) is located. At these locations, the FSS provides advisory service to arriving and departing aircraft.
MAC
Mid Air Collision
Propeller Anti-icers:
Ice often forms on the propeller before it is visible on the wing. Props are treated with deicing fluid applied by slinger rings on the prop hub or with electrically heated elements on the leading edges.
Wake Turbulence
Wake turbulence is a concern whenever small aircraft share an airport with larger ones. The powerful vortices that spiral off the wing tips of heavier aircraft—turboprops and business jets, as well as airliners— can suddenly and unexpectedly toss a small airplane out of control.
ILS holding position sign
ATC may hold you at this sign when the instrument landing system is being used at the airport.
SIGMET
An in-flight weather advisory that is considered significant to all aircraft. SIGMET criteria include severe icing, severe and extreme turbulence, duststorms, sandstorms, volcanic eruptions, and volcanic ash that lower visibility to less than 3 miles.
Sterile Cockpit
Complacency and lack of attention are the enemies of MAC avoidance strategies. To keep crews focused, airlines mandate a “sterile cockpit” at altitudes below 10,000 feet AGL; that is, all conversation not pertaining to operation of the aircraft is forbidden during these times.
REILs
Runway end identifier lights Airport Lighting (For further information and a complete set of approach consist of
a pair of synchronized flashing lights located on each side of the runway threshold.
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