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Pilot/Controller Glossary

3/29/18

PCG A−7

AIRMETs cover moderate icing, moderate turbu-

lence, sustained winds of 30 knots or more at the

surface, widespread areas of ceilings less than 1,000

feet and/or visibility less than 3 miles, and extensive

mountain obscurement.

(See AWW.)
(See CONVECTIVE SIGMET.)
(See CWA.)
(See SIGMET.)
(Refer to AIM.)

AIRPORT− An area on land or water that is used or

intended to be used for the landing and takeoff of

aircraft and includes its buildings and facilities, if

any.

AIRPORT ADVISORY AREA− The area within ten

miles of an airport without a control tower or where

the tower is not in operation, and on which a Flight

Service Station is located.

(See LOCAL AIRPORT ADVISORY.)
(Refer to AIM.)

AIRPORT ARRIVAL RATE (AAR)− A dynamic

input parameter specifying the number of arriving

aircraft which an airport or airspace can accept from

the ARTCC per hour. The AAR is used to calculate

the desired interval between successive arrival

aircraft.

AIRPORT DEPARTURE RATE (ADR)− A dynamic

parameter specifying the number of aircraft which

can depart an airport and the airspace can accept per

hour.

AIRPORT ELEVATION− The highest point of an

airport’s usable runways measured in feet from mean

sea level.

(See TOUCHDOWN ZONE ELEVATION.)
(See ICAO term AERODROME ELEVATION.)

AIRPORT LIGHTING− Various lighting aids that

may be installed on an airport. Types of airport

lighting include:

a. Approach Light System (ALS)− An airport

lighting facility which provides visual guidance to

landing aircraft by radiating light beams in a

directional pattern by which the pilot aligns the

aircraft with the extended centerline of the runway on

his/her final approach for landing. Condenser-

Discharge Sequential Flashing Lights/Sequenced

Flashing Lights may be installed in conjunction with

the ALS at some airports. Types of Approach Light

Systems are:

1. ALSF-1− Approach Light System with

Sequenced Flashing Lights in ILS Cat-I configura-

tion.

2. ALSF-2− Approach Light System with

Sequenced Flashing Lights in ILS Cat-II configura-

tion. The ALSF-2 may operate as an SSALR when

weather conditions permit.

3. SSALF− Simplified Short Approach Light

System with Sequenced Flashing Lights.

4. SSALR− Simplified Short Approach Light

System with Runway Alignment Indicator Lights.

5. MALSF− Medium Intensity Approach Light

System with Sequenced Flashing Lights.

6. MALSR− Medium Intensity Approach Light

System with Runway Alignment Indicator Lights.

7. RLLS− Runway Lead-in Light System

Consists of one or more series of flashing lights

installed at or near ground level that provides positive

visual guidance along an approach path, either

curving or straight, where special problems exist with

hazardous terrain, obstructions, or noise abatement

procedures.

8. RAIL− Runway Alignment Indicator Lights−

Sequenced Flashing Lights which are installed only

in combination with other light systems.

9. ODALS− Omnidirectional Approach Light-

ing System consists of seven omnidirectional

flashing lights located in the approach area of a

nonprecision runway. Five lights are located on the

runway centerline extended with the first light

located 300 feet from the threshold and extending at

equal intervals up to 1,500 feet from the threshold.

The other two lights are located, one on each side of

the runway threshold, at a lateral distance of 40 feet

from the runway edge, or 75 feet from the runway

edge when installed on a runway equipped with a

VASI.

(Refer to FAA Order JO 6850.2, VISUAL

GUIDANCE LIGHTING SYSTEMS.)

b. Runway Lights/Runway Edge Lights− Lights

having a prescribed angle of emission used to define

the lateral limits of a runway. Runway lights are

uniformly spaced at intervals of approximately 200

feet, and the intensity may be controlled or preset.

c. Touchdown Zone Lighting− Two rows of

transverse light bars located symmetrically about the