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Pilot/Controller Glossary


PCG A−12



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 IAFs 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 IAFs.

c. STANDARD I− An RNAV approach design for

a single runway with both corner IAFs eliminated.

Course reversal or radar vectoring may be required at

busy terminals with multiple runways.


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 en route structure direct to the

nearest IAF. TAAs will also eliminate or reduce

feeder routes, departure extensions, and procedure

turns or course reversal.


centered on the IF bounded by a straight line

extending through the IF perpendicular to the

intermediate course.

2. LEFT BASE AREA− A 30NM arc centered

on the right corner IAF. The area shares a boundary

with the straight-in area except that it extends out for

30NM from the IAF and is bounded on the other side

by a line extending from the IF through the FAF to the


3. RIGHT BASE AREA− A 30NM arc centered

on the left corner IAF. The area shares a boundary

with the straight-in area except that it extends out for

30NM from the IAF and is bounded on the other side

by a line extending from the IF through the FAF to the





A GPS approach, which requires vertical guidance,

used in lieu of an ILS PRM approach to conduct

approaches to parallel runways whose extended

centerlines are separated by less than 4,300 feet and

at least 3,000 feet, where simultaneous close parallel

approaches are permitted. Also used in lieu of an ILS

PRM and/or LDA PRM approach to conduct

Simultaneous Offset Instrument Approach (SOIA)

ARINC− An acronym for Aeronautical Radio, Inc.,

a corporation largely owned by a group of airlines.

ARINC is licensed by the FCC as an aeronautical

station and contracted by the FAA to provide

communications support for air traffic control and

meteorological services in portions of international


BULLETIN− A bulletin that provides air operation

data covering Army, National Guard, and Army

Reserve aviation activities.


ARRESTING SYSTEM− A safety device consisting

of two major components, namely, engaging or

catching devices and energy absorption devices for

the purpose of arresting both tailhook and/or

nontailhook-equipped aircraft. It is used to prevent

aircraft from overrunning runways when the aircraft

cannot be stopped after landing or during aborted

takeoff. Arresting systems have various names; e.g.,

arresting gear, hook device, wire barrier cable.

(See ABORT.)
(Refer to AIM.)


generated program in hundredths of minutes based

upon the AAR. AAI is the desired optimum interval

between successive arrival aircraft over the vertex.
ARRIVAL CENTER− The ARTCC having jurisdic-

tion for the impacted airport.
ARRIVAL DELAY− A parameter which specifies a

period of time in which no aircraft will be metered for

arrival at the specified airport.
ARRIVAL SECTOR− An operational control sector

containing one or more meter fixes.

ordered list of data on arrivals displayed at the