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Weather depiction chart. Details surface conditions as derived from METAR and other surface observations.
G-35
Weight. The force exerted by an aircraft from the pull of gravity.
Wide area augmentation system (WAAS). A differential global positioning system (DGPS) that improves the accuracy of the system by determining position error from the GPS satellites, then transmitting the error, or corrective factors, to the airborne GPS receiver.
Wind correction angle (WCA). The angle between the desired track and the heading of the aircraft necessary to keep the aircraft tracking over the desired track.
Wind direction indicators. Indicators that include a wind sock, wind tee, or tetrahedron. Visual reference will determine wind direction and runway in use.
Wind shear. A sudden, drastic shift in windspeed, direction, or both that may occur in the horizontal or vertical plane.
Winds and temperature aloft forecast (FD). A twice daily forecast that provides wind and temperature forecasts for
specific locations in the contiguous United States.
Wing area. The total surface of the wing (in square feet), which includes control surfaces and may include wing area covered by the fuselage (main body of the airplane), and engine nacelles.
Wings. Airfoils attached to each side of the fuselage and are the main lifting surfaces that support the airplane in flight.
Wing span. The maximum distance from wingtip to wingtip.
Wingtip vortices. The rapidly rotating air that spills over an airplane’s wings during flight. The intensity of the turbulence depends on the airplane’s weight, speed, and configuration. Also referred to as wake turbulence. Vortices from heavy aircraft may be extremely hazardous to small aircraft.
Wing twist. A design feature incorporated into some wings to improve aileron control effectiveness at high angles of attack during an approach to a stall.
Work. A measurement of force used to produce movement.
World Aeronautical Charts (WAC). A standard series of aeronautical charts covering land areas of the world at a size and scale convenient for navigation (1:1,000,000) by moderate speed aircraft. Topographic information includes cities and towns, principal roads, railroads, distinctive landmarks, drainage, and relief. Aeronautical information includes visual and radio aids to navigation, airports, airways, restricted areas, obstructions and other pertinent data.
Zone of confusion. Volume of space above the station where a lack of adequate navigation signal directly above the VOR station causes the needle to deviate.
Zulu time. A term used in aviation for coordinated universal time (UTC) which places the entire world on one time standard.
G-36
I-1
Index
Airspeed .........................................................................8-2
Airspeed indicator (ASI) ...............................7-1, 7-8, 10-2
Airspeed tape ...............................................................7-12
Airworthiness certificate ................................................8-7
Airworthiness directives (ADs) ...................................8-12
Air Commerce Act .........................................................1-4
Air data computer (ADC) ............................................7-14
Air masses ..................................................................11-18
Air route surveillance radar (ARSR) ...........................12-2
Air route traffic control center (ARTCC) ....................12-2
Air traffic control (ATC) ...........................1-6, 13-13, 14-7
Alcohol .......................................................................16-13
Alert areas ....................................................................14-4
Alternator .....................................................................6-28
Altimeter ................................................7-1, 7-3, 7-5, 7-12
Altimeter setting ...........................................................12-7
Altimeter system inspection ...........................................8-9
Altitude ........................................................................11-6
Altitude-induced decompression sickness (DCS) ......16-16
Alto ............................................................................11-17
Ammeter ......................................................................6-30
Aneroid barometer .......................................................11-5
Angle of attack (AOA) ...................................................5-4
Annual inspection ..........................................................8-8
Anti-ice ........................................................................6-37
Antiservo tab ........................................................2-6, 5-11
Approach light systems ................................................13-7
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Pilot's Handbook of Aeronautical Knowledge航空知识手册3(104)
