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an IFR flight plan, having an air traffic control authorization, operating clear of clouds with at least one mile
flight visibility, and a reasonable expectation of contin
C-8
Descend Via – A descend via clearance instructs you to
follow the altitudes published on a STAR. You are not
authorized to leave your last assigned altitude unless
specifically cleared to do so. If ATC amends the altitude or route to one that is different from the published
procedure, the rest of the charted descent procedure is
canceled. ATC will assign you any further route, altitude, or airspeed clearances, as necessary.
Digital ATIS (D-ATIS) – An alternative method of
receiving ATIS reports by aircraft equipped with
datalink services capable of receiving information in
the cockpit over their Aircraft Communications
Addressing and Reporting System (ACARS) unit.
Diverse Vector Area (DVA) – An airport may establish
a diverse vector area if it is necessary to vector aircraft
below the minimum vectoring altitude to assist in the
efficient flow of departing traffic. DVA design requirements are outlined in TERPS and allow for the vectoring of aircraft immediately off the departure end of the
runway below the MVA.
Dynamic Magnetic Variation – A field which is simply a computer model calculated value instead of a
measured value contained in the record for a waypoint.
Electronic Flight Bag (EFB) – An electronic display
system intended primarily for cockpit or cabin use.
EFB devices can display a variety of aviation data or
perform basic calculations (e.g., performance data, fuel
calculations, etc.). In the past, some of these functions
were traditionally accomplished using paper references
or were based on data provided to the flight crew by an
airline’s “flight dispatch” function. The scope of the
EFB system functionality may also include various
other hosted databases and applications. Physical EFB
displays may use various technologies, formats, and
forms of communication. These devices are sometimes
referred to as auxiliary performance computers (APC)
or laptop auxiliary performance computers (LAPC).
Ellipsoid of Revolution – The surface that results
when an ellipse is rotated about one of its axes.
En Route Obstacle Clearance Areas – Obstacle clearance areas for en route planning are identified as primary, secondary, and turning areas, and they are
designed to provide obstacle clearance route protection
width for airways and routes.
Expanded Service Volume – When ATC or a procedures specialist requires the use of a NAVAID beyond
the limitations specified for standard service volume,
an expanded service volume (ESV) may be established.
See standard service volume.
Feeder Route – A feeder route is a route depicted on
IAP charts to designate courses for aircraft to proceed
from the en route structure to the IAF. Feeder routes,
also referred to as approach transitions, technically are
not considered approach segments but are an integral
part of many IAPs.
Field - See Database Field
Final Approach and Takeoff Area (FATO) – The
FATO is a defined heliport area over which the final
approach to a hover or a departure is made. The touchdown and lift-off area (TLOF) where the helicopter is
permitted to land is normally centered in the FATO. A
safety area is provided around the FATO.
Fix – A geographical position determined by visual reference to the surface, by reference to one or more radio
NAVAIDs, by celestial plotting, or by another navigational device. Note: Fix is a generic name for a geographical position and is referred to as a fix, waypoint,
intersection, reporting point, etc.
Flight Information Region (FIR) – A FIR is an airspace of defined dimensions within which Flight
Information Service and Alerting Service are provided.
Flight Information Service (FIS) is a service provided
for the purpose of giving advice and information useful
for the safe and efficient conduct of flights. Alerting
Service is a service provided to notify appropriate
organizations regarding aircraft in need of search and
rescue aid, and assist such organizations as required.
Flight Level (FL) – A flight level is a level of constant
atmospheric pressure related to a reference datum of
29.92 in.Hg. Each flight level is stated in three digits
that represents hundreds of feet. For example, FL 250
represents an altimeter indication of 25,000 feet.
Floating Waypoints – Floating waypoints represent
airspace fixes at a point in space not directly associated
with a conventional airway. In many cases they may be
　
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