APRON (ICAO) - A defined area, on a land aerodrome, intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking or maintenance.
APRON/RAMP (P/CG, JCS, NATO) - A defined area on an airport or heliport intended to accommodate aircraft for purposes of loading or unloading passengers or cargo, refueling, parking, or maintenance. With regard to seaplanes, a ramp is used for access to the apron from the water.
ARC - The track over the ground of an aircraft flying at a constant distance from a navigational aids by reference to distance measuring equipment (DME).
AREA CONTROL CENTER/ACC (JCS, NATO, ICAO) - A unit established to provide Air Traffic Control service to controlled flights in control areas under its jurisdiction. This term is applicable within ICAO Regions.
AREA NAVIGATION (RNAV) APPROACH CONFIGURATION (P/CG) -
a. STANDARD T - An RNAV approach whose design allows direct flight to any one of three initial approach fixes (IAF) and eliminates the need for procedure turns. The standard design is to align the procedure on the extended centerline with the missed approach point (MAP) at the runway threshold, the final approach fix (FAF), and the initial approach/intermediate fix (IAF/IF). The other two IF’s will be established perpendicular to the IF.
b.
MODIFIED T - An RNAV approach design for single or multiple runways where terrain or operational constraints do not allow for the standard T. The "T" may be modified by increasing or decreasing the angle from the corner IAF(s) to the IF or by eliminating one or both corner IAF's.
c.
STANDARD I - An RNAV approach design for a single runway with both corner IAF's eliminated. Course reversal or radar vectoring may be required at busy terminals with multiple runways.
d.
TERMINAL ARRIVAL AREA (TAA) - The TAA is controlled airspace established in conjunction with the Standard or Modified T and I RNAV approach configurations. In the standard TAA, there are three areas: straight-in, left base, and right base. The arc boundaries of the three areas of the TAA are published portions of the approach and allow aircraft to transition from the enroute structure direct to the nearest IAF. TAA's will also eliminate or reduce feeder routes, departure extensions, and procedure turns or course reversal.
(1)
STRAIGHT-IN AREA - A 30 NM arc centered on the IF bounded by a straight line extending through the IF perpendicular to the intermediate course.
(2)
LEFT BASE AREA - A 30 NM arc centered on the right corner IAF. The area shares a boundary with the straight-in area except that it extends out for 30 NM from the IAF and is bounded on the other side by a line extending from the IF through the FAF to the arc.
(3)
RIGHT BASE AREA - A 30 NM arc centered on the left corner IAF. The area shares a boundary with the straight-in area except that it extends out for 30 NM from the IAF and is bounded on the other side by a line extending from IF through the FAF to the arc.
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