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Aeronautical Information Manual (AIM), page 683

12/10/15 Pilot/Controller Glossary

OROCA- An off-route altitude which provides
obstruction clearance with a 1,000 foot buffer in
nonmountainous 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.

OUTER AREA (associated with Class C airspace)-

Nonregulatory 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/HOST 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.
g. Altitude (at least 500 feet above the convention-
al pattern).
h. A "Roll-out" on final approach not less than 1/4
mile from the landing threshold and not less than 300
feet above the ground.

PCG O-3

Page 683 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

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