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12/2/21 

Pilot/Controller Glossary 

delay in their stop and go, delay clearing the runway, 
or are unable to comply with the instruction(s). 

(See CLEARED FOR THE OPTION.) 
(Refer to AIM.) 

ORGANIZED TRACK SYSTEM

 A series of ATS 

routes which are fixed and charted; i.e., CEP, 
NOPAC, or flexible and described by NOTAM; i.e., 
NAT TRACK MESSAGE. 

OTR

 

(See OCEANIC TRANSITION ROUTE.) 

OTS

 

(See ORGANIZED TRACK SYSTEM.) 

OUT

 The conversation is ended and no response is 

expected. 

OUT OF SERVICE/UNSERVICEABLE (U/S)

 

When a piece of equipment, a NAVAID, 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 full­time 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 site­specific 
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 canceled 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. 

PCG O