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maneuver has been initiated, the pilot is expected to
continue until the specifications of the instructions
have been met. “When able,” should not be used
when expeditious compliance is required.
WIDE-AREA AUGMENTATION SYSTEM
(WAAS)− The WAAS is a satellite navigation system
consisting of the equipment and software which
augments the GPS Standard Positioning Service
(SPS). The WAAS provides enhanced integrity,
accuracy, availability, and continuity over and above
GPS SPS. The differential correction function provides
improved accuracy required for precision
approach.
WILCO− I have received your message, understand
it, and will comply with it.
WIND GRID DISPLAY− A display that presents the
latest forecasted wind data overlaid on a map of the
ARTCC area. Wind data is automatically entered and
updated periodically by transmissions from the
National Weather Service. Winds at specific altitudes,
along with temperatures and air pressure can be
viewed.
WIND SHEAR− A change in wind speed and/or wind
direction in a short distance resulting in a tearing or
shearing effect. It can exist in a horizontal or vertical
direction and occasionally in both.
WING TIP VORTICES−
(See VORTICES.)
WORDS TWICE−
a. As a request: “Communication is difficult.
Please say every phrase twice.”
b. As information: “Since communications are
difficult, every phrase in this message will be spoken
twice.”
WORLD AERONAUTICAL CHARTS−
(See AERONAUTICAL CHART.)
WS−
(See SIGMET.)
(See WEATHER ADVISORY.)
WST−
(See CONVECTIVE SIGMET.)
(See WEATHER ADVISORY.)

2/17/05 AIM
Index I−1
INDEX
[References are to page numbers]
A
Abbreviations/Acronyms, A3−1
Accident, Aircraft, Reporting, 7−6−1
Accident Cause Factors, 7−5−1
Adherence to Clearance, 4−4−5
ADIZ. See Air Defense Identification Zones
Advisories
Braking Action, 4−3−7
Inflight Aviation Weather, 7−1−8
Minimum Fuel, 5−5−6
Runway Friction, 4−3−8
Traffic, 5−5−4
Aerobatic Flight, 8−1−7
Aeronautical
Charts, 9−1−1
Publications, 9−1−1
Aeronautical Light Beacons, 2−2−1
AHRS. See Attitude Heading Reference System
Air Ambulance Flights, 4−2−4
Air Defense Identification Zone, Land−Based,
5−6−1
Air Defense Identification Zones, 5−6−1, 5−6−7
Air Route Surveillance Radar, 4−5−7
Air Route Traffic Control Centers, 4−1−1
Air Traffic Control
Aircraft Separation, 4−4−1
Clearances, 4−4−1
Pilot Services, 4−1−1
Air Route Traffic Control Centers, 4−1−1
Airport Reservations, 4−1−20
Approach Control Service, Arriving VFR
Aircraft, 4−1−2
Automatic Terminal Information Service,
4−1−7
Communications, Release of IFR Aircraft,
Airports without Operating Control Tower,
4−1−1
Control Towers, 4−1−1
Flight Service Stations, 4−1−1
Ground Vehicle Operations, 4−1−6
Hazardous Area Reporting Service, 4−1−17
IFR Approaches, 4−1−6
Operation Raincheck, 4−1−2
Operation Take−off, 4−1−2
Radar Assistance to VFR Aircraft, 4−1−11
Radar Traffic Information Service, 4−1−8
Recording and Monitoring, 4−1−1
Safety Alert, 4−1−10
Terminal Radar Services for VFR Aircraft,
4−1−11
Tower En Route Control, 4−1−13
Traffic Advisory Practices, Airports Without
Operating Control Towers, 4−1−2
Transponder Operation, 4−1−14
Unicom, Use for ATC Purposes, 4−1−7
Unicom/Multicom, 4−1−6
Air Traffic Control Radar Beacon System, 4−1−14,
4−5−2
Aircraft
Arresting Devices, 2−3−30
Call Signs, 4−2−3
Lights, Use in Airport Operations, 4−3−19
VFR, Emergency Radar Service, 6−2−1
Aircraft Conflict Alert, 4−1−10
Airport
Aids, Marking, 2−3−1
Holding Position, 2−3−12
Pavement, 2−3−1
Holding Position, 2−3−1
Other, 2−3−1
Runway, 2−3−1
　
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