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Pilot/Controller Glossary

3/29/18

PCG O−3

OFF−ROUTE OBSTRUCTION CLEARANCE AL-

TITUDE (OROCA)− An off-route altitude which

provides obstruction clearance with a 1,000 foot

buffer in non−mountainous terrain areas and a 2,000

foot buffer in designated mountainous areas within

the United States. This altitude may not provide

signal coverage from ground-based navigational

aids, air traffic control radar, or communications

coverage.

OTR−

(See OCEANIC TRANSITION ROUTE.)

OTS−

(See ORGANIZED TRACK SYSTEM.)

OUT− The conversation is ended and no response is

expected.

OUT OF SERVICE− When a piece of equipment, a

system, a facility or a service is not operational,

certified (if required) and immediately “available”

for Air Traffic or public use.

OUTER AREA (associated with Class C airspace)−

Non−regulatory airspace surrounding designated

Class C airspace airports wherein ATC provides radar

vectoring and sequencing on a full-time basis for all

IFR and participating VFR aircraft. The service

provided in the outer area is called Class C service

which includes: IFR/IFR−IFR separation; IFR/

VFR−traffic advisories and conflict resolution; and

VFR/VFR−traffic advisories and, as appropriate,

safety alerts. The normal radius will be 20 nautical

miles with some variations based on site-specific

requirements. The outer area extends outward from

the primary Class C airspace airport and extends from

the lower limits of radar/radio coverage up to the

ceiling of the approach control’s delegated airspace

excluding the Class C charted area and other airspace

as appropriate.

(See CONFLICT RESOLUTION.)
(See CONTROLLED AIRSPACE.)

OUTER COMPASS LOCATOR−

(See COMPASS LOCATOR.)

OUTER FIX− A general term used within ATC to

describe fixes in the terminal area, other than the final

approach fix. Aircraft are normally cleared to these

fixes by an Air Route Traffic Control Center or an

Approach Control Facility. Aircraft are normally

cleared from these fixes to the final approach fix or

final approach course.

OR

OUTER FIX− An adapted fix along the converted

route of flight, prior to the meter fix, for which

crossing times are calculated and displayed in the

metering position list.
OUTER FIX ARC− A semicircle, usually about a

50−70 mile radius from a meter fix, usually in high

altitude, which is used by CTAS/ERAM to calculate

outer fix times and determine appropriate sector

meter list assignments for aircraft on an established

arrival route that will traverse the arc.
OUTER FIX TIME− A calculated time to depart the

outer fix in order to cross the vertex at the ACLT. The

time reflects descent speed adjustments and any

applicable delay time that must be absorbed prior to

crossing the meter fix.
OUTER MARKER− A marker beacon at or near the

glideslope intercept altitude of an ILS approach. It is

keyed to transmit two dashes per second on a 400 Hz

tone, which is received aurally and visually by

compatible airborne equipment. The OM is normally

located four to seven miles from the runway threshold

on the extended centerline of the runway.

(See INSTRUMENT LANDING SYSTEM.)
(See MARKER BEACON.)
(Refer to AIM.)

OVER−  My transmission is ended; I expect a

response.
OVERHEAD MANEUVER− A series of predeter-

mined maneuvers prescribed for aircraft (often in

formation) for entry into the visual flight rules (VFR)

traffic pattern and to proceed to a landing. An

overhead maneuver is not an instrument flight rules

(IFR) approach procedure. An aircraft executing an

overhead maneuver is considered VFR and the IFR

flight plan is cancelled when the aircraft reaches the

“initial point” on the initial approach portion of the

maneuver. The pattern usually specifies the

following:

a. The radio contact required of the pilot.
b. The speed to be maintained.
c. An initial approach 3 to 5 miles in length.
d. An elliptical pattern consisting of two 180

degree turns.

e. A break point at which the first 180 degree turn

is started.

f. The direction of turns.