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The estimating or determining of position by advancing an earlier known position by
the application of direction, time and speed data.
DENSITY HEIGHT
An atmospheric density expressed in terms of height which corresponds to that
density in the standard atmosphere.
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DEFINITIONS
DISTANCE MEASURING EQUIPMENT (DME)
Equipment which measures in nautical miles, the slant range of an aircraft from the
selected DME ground station.
DME DISTANCE
The slant range from the source of a DME signal to the receiving antenna.
DISTRESS
A stage of being threatened by serious and imminent danger and of requiring
immediate assistance.
DOMESTIC FLIGHT
A flight between two points within Australia.
ELEVATION (ELEV)
The vertical distance of a point or a level, on or affixed to the surface of the earth,
measured from mean sea level.
EMERGENCY PHASES
•Uncertainly Phase: A situation wherein uncertainty exists as to the safety of an
aircraft and its occupants.
• Alert Phase: A situation wherein apprehension exists as to the safety
of an aircraft and its occupants.
• Distress Phase: A situation wherein there is reasonable certainty that an aircraft
and its occupants are threatened by grave and imminent danger or require
immediate assistance.
ESTIMATE
The time at which it is estimated that an aircraft will be over a position reporting
point or over the destination.
ESTIMATED ELAPSED TIME
The estimated time to proceed from one significant point to another.
ESTIMATED TIME OF ARRIVAL
For VFR flights, the time at which the aircraft is estimated to arrive over the
aerodrome of intended landing.
FINAL LEG
The path of an aircraft in a straight line immediately preceding the landing
(alighting) of the aircraft.
FIX
A geographical position of an aircraft at a specific time determined by visual
reference to the surface, or by navigational aids.
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DEFINITIONS
FLIGHT FILE
A file stored on the NAIPS system which contains stored briefings,
or a stored flight notification. Flight files are owned by pilots and / or operators,
and updated at their request.
FLIGHT INFORMATION
Information which may be of assistance to a pilot in the planning and progress of a
flight.
FLIGHT INFORMATION AREA (FIA)
An airspace of defined dimensions, excluding controlled airpsace, within which
flight information and SAR alerting services are provided by an ATS unit.
NOTE: FIA’s may be sub-divided to permit the specified ATS unit to provide its
services on a discrete frequency or family of frequencies within particular
areas.
FLIGHT INFORMATION CENTRE
A unit established to provide flight information and SAR alerting services.
FLIGHT INFORMATION OFFICE
A unit providing briefing and debriefing services.
FLIGHT INFORMATION REGION (FIR)
An airspace of defined dimensions within which flight information service and
alerting service are provided.
FLIGHT INFORMATION SERVICE (FIS)
A service provided for the purpose of giving advice and information useful for the
safe and efficient conduct of flights.
FLIGHT INFORMATION SERVICE STATION (FISS)
A unit providing flight information services.
FLIGHT LEVEL (FL)
A surface of constant atmospheric pressure which is related to a specific pressure
datum, 1013.2HPA and is separated from other such surfaces by specific pressure
intervals.
NOTE: A pressure type altimeter calibrated in accordance with the Standard
Atmosphere
• When set to a QNH altimeter setting, will indicate altitude, and
• When set to a pressure of 1013.2HPA may be used to indicate flight levels.
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DEFINITIONS
FLIGHT NOTE
Details of the route and timing of a proposed flight provided by the pilot-incommand
of an aircraft, which is other than notification submitted to the
Airservices Australia, and which is required to be left with a person who could be
expected to notify appropriate authorities in the event that the flight becomes
overdue.
FLIGHT SERVICES (FS)
Air-ground communications services, flight information services and SAR alerting
services provided by ATS units.
FLIGHT STAGE
A route or part of a route flown between any two aerodromes without
an intermediate landing.
FORECAST
A statement of expected meteorological conditions for a specified period, and for a
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