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Pilot/Controller Glossary

3/29/18

PCG S−6

transiting the area are equally responsible for

collision avoidance.

b. Controlled Firing Area− Airspace wherein

activities are conducted under conditions so

controlled as to eliminate hazards to nonparticipating

aircraft and to ensure the safety of persons and

property on the ground.

c. Military Operations Area (MOA)− Permanent

and temporary MOAs are airspace established

outside of Class A airspace area to separate or

segregate certain nonhazardous military activities

from IFR traffic and to identify for VFR traffic where

these activities are conducted. Permanent MOAs are

depicted on Sectional Aeronautical, VFR Terminal

Area, and applicable En Route Low Altitude Charts.

Note: Temporary MOAs are not charted.
(Refer to AIM.)

d. Prohibited Area− Airspace designated under

14 CFR Part 73 within which no person may operate

an aircraft without the permission of the using

agency.

(Refer to AIM.)
(Refer to En Route Charts.)

e. Restricted Area− Permanent and temporary

restricted areas are airspace designated under 14 CFR

Part 73, within which the flight of aircraft, while not

wholly prohibited, is subject to restriction. Most

restricted areas are designated joint use and IFR/VFR

operations in the area may be authorized by the

controlling ATC facility when it is not being utilized

by the using agency. Permanent restricted areas are

depicted on Sectional Aeronautical, VFR Terminal

Area, and applicable En Route charts. Where joint

use is authorized, the name of the ATC controlling

facility is also shown. 

Note: Temporary restricted areas are not charted.
(Refer to 14 CFR Part 73.)
(Refer to AIM.)

f. Warning Area− A warning area is airspace of

defined dimensions extending from 3 nautical miles

outward from the coast of the United States, that

contains activity that may be hazardous to

nonparticipating aircraft. The purpose of such

warning area is to warn nonparticipating pilots of the

potential danger. A warning area may be located over

domestic or international waters or both.

SPECIAL VFR CONDITIONS− Meteorological

conditions that are less than those required for basic

VFR flight in Class B, C, D, or E surface areas and

in which some aircraft are permitted flight under

visual flight rules.

(See SPECIAL VFR OPERATIONS.)
(Refer to 14 CFR Part 91.)

SPECIAL VFR FLIGHT [ICAO]− A VFR flight

cleared by air traffic control to operate within Class

B, C, D, and E surface areas in metrological

conditions below VMC.
SPECIAL VFR OPERATIONS− Aircraft operating

in accordance with clearances within Class B, C, D,

and E surface areas in weather conditions less than the

basic VFR weather minima. Such operations must be

requested by the pilot and approved by ATC.

(See SPECIAL VFR CONDITIONS.)
(See ICAO term SPECIAL VFR FLIGHT.)

SPEED−

(See AIRSPEED.)
(See GROUND SPEED.)

SPEED ADJUSTMENT− An ATC procedure used to

request pilots to adjust aircraft speed to a specific

value for the purpose of providing desired spacing.

Pilots are expected to maintain a speed of plus or

minus 10 knots or 0.02 Mach number of the specified

speed. Examples of speed adjustments are:

a. “Increase/reduce speed to Mach point

(number).”

b. “Increase/reduce speed to (speed in knots)” or

“Increase/reduce speed (number of knots) knots.”
SPEED BRAKES− Moveable aerodynamic devices

on aircraft that reduce airspeed during descent and

landing.
SPEED SEGMENTS− Portions of the arrival route

between the transition point and the vertex along the

optimum flight path for which speeds and altitudes

are specified. There is one set of arrival speed

segments adapted from each transition point to each

vertex. Each set may contain up to six segments.
SQUAWK (Mode, Code, Function)−  Activate

specific modes/codes/functions on the aircraft

transponder; e.g., “Squawk three/alpha, two one zero

five, low.”

(See TRANSPONDER.)

STA−

(See SCHEDULED TIME OF ARRIVAL.)

STAGING/QUEUING− The placement, integration,

and segregation of departure aircraft in designated