WAYPOINT - A predetermined geographical position used for route/instrument approach definition, or progress reporting purposes, that is defined relative to a VORTAC station or in terms of latitude/longitude coordinates. (NGA assigned Waypoint names are strictly for electronic identification in the Digital Aeronautical Flight Information File (DAFIF). Neither FAA nor ATC use these Waypoints for flight planning or clearance requests.)
WEATHER ADVISORY/INFLIGHT WEATHER ADVISORY - (See SIGMET, AIRMET)
WEATHER ADVISORY/WS/WST/WA/CWA - In aviation weather forecast practice, an expression of hazardous weather conditions not predicted in the area forecast, as they affect the operation of air traffic and as prepared by the National Weather Service.
WHEN ABLE - When used in conjunction with Air Traffic Control instructions, gives the pilot the latitude to delay compliance until a condition or event has been reconciled. Unlike "pilot discretion," when instructions are prefaced "when able," the pilot is expected to seek the first opportunity to comply. Once a 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.
WILCO - I have received your message, understand it, and will comply with it.
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.
WORDS TWICE -
(1)
As a request: "Communication is difficult. Please say every phrase twice."
(2)
As information: "Since communications are difficult, every phrase in this message will be spoken twice."
Chapter 3
FLIP PROGRAM
3-1 GENERAL - This chapter describes the DoD FLIP program, individual FLIP products and related publications.
a.
DoD FLIPs are published with effective dates which coincide with a schedule established by the internationally accepted Aeronautical Information Regulation and Control (AIRAC) system. Under this arrangement, which is associated with the Notice to Airmen (NOTAM) system, changes announced in advance are effective on a 28 day basis. Note that in the following individual product descriptions of DoD FLIPs, the common AIRAC 4 week cycle (or increments thereof) is followed.
b.
DoD FLIP product groups are aligned with the three flight phases - Planning, Enroute and Terminal, therefore no single publication contains all of the information which may be required by aircrews. Planning documents and charts, enroute charts and supplements, terminal procedures, and also NOTAM files must be consulted prior to flight. International flight planners must also refer to the Foreign Clearance Guide.
c.
The following DoD FLIP products can be downloaded from https://www.geointel.nga.mil DAFIF, Planning Documents, Flight Information Handbook, and Terminal Instrument Procedures. Downloaded products from the NGA web site should be cross checked against Traditional Paper FLIP. Aircrews have a responsibility to report deviations IAW paragraph 3-8. Not every Terminal IAP produced by NGA is available at the NGA web site.
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