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Pilot/Controller Glossary

4/3/14

PCG G−2

GNSS MEA−

(See 

GLOBAL NAVIGATION SATELLITE

SYSTEM MINIMUM EN ROUTE IFR
ALTITUDE.)

GO AHEAD

− Proceed with your message. Not to be

used for any other purpose.

GO AROUND

− Instructions for a pilot to abandon

his/her approach to landing. Additional instructions

may follow. Unless otherwise advised by ATC, a

VFR aircraft or an aircraft conducting visual

approach should overfly the runway while climbing

to traffic pattern altitude and enter the traffic pattern

via the crosswind leg. A pilot on an IFR flight plan

making an instrument approach should execute the

published missed approach procedure or proceed as

instructed by ATC; e.g., “Go around” (additional

instructions if required).

(See LOW APPROACH.)
(See MISSED APPROACH.)

GPD−

(See GRAPHIC PLAN DISPLAY.)

GPS−

(See GLOBAL POSITIONING SYSTEM.)

GRAPHIC PLAN DISPLAY (GPD)− A view

available with URET that provides a graphic display

of aircraft, traffic, and notification of predicted

conflicts. Graphic routes for Current Plans and Trial

Plans are displayed upon controller request.

(See USER REQUEST EVALUATION TOOL.)

GROSS NAVIGATION ERROR (GNE) − A lateral

deviation from a cleared track, normally in excess of

25 Nautical Miles (NM).  More stringent standards

(for example, 10NM in some parts of the North

Atlantic region) may be used in certain regions to

support reductions in lateral separation.
GROUND−BASED TRANSCEIVER (GBT)− The

ground−based transmitter/receiver (transceiver) re-

ceives automatic dependent surveillance−broadcast

messages, which are forwarded to an air traffic

control facility for processing and display with other

radar targets on the plan position indicator (radar

display).

(See AUTOMATIC DEPENDENT

SURVEILLANCE-BROADCAST.)

GROUND CLUTTER− A pattern produced on the

radar scope by ground returns which may degrade

other radar returns in the affected area. The effect of

ground clutter is minimized by the use of moving

target indicator (MTI) circuits in the radar equipment

resulting in a radar presentation which displays only

targets which are in motion.

(See CLUTTER.)

GROUND COMMUNICATION OUTLET (GCO)−

An unstaffed, remotely controlled, ground/ground

communications facility. Pilots at uncontrolled

airports may contact ATC and FSS via VHF to a

telephone connection to obtain an instrument

clearance or close a VFR or IFR flight plan. They may

also get an updated weather briefing prior to takeoff.

Pilots will use four “key clicks” on the VHF radio to

contact the appropriate ATC facility or six “key

clicks” to contact the FSS. The GCO system is

intended to be used only on the ground.

GROUND CONTROLLED APPROACH− A radar

approach system operated from the ground by air

traffic control personnel transmitting instructions to

the pilot by radio. The approach may be conducted

with surveillance radar (ASR) only or with both

surveillance and precision approach radar (PAR).

Usage of the term “GCA” by pilots is discouraged

except when referring to a GCA facility. Pilots should

specifically request a “PAR” approach when a

precision radar approach is desired or request an

“ASR” or “surveillance” approach when a nonpreci-

sion radar approach is desired.

(See RADAR APPROACH.)

GROUND DELAY PROGRAM (GDP)− A traffic

management process administered by the ATCSCC;

when aircraft are held on the ground. The purpose of

the program is to support the TM mission and limit

airborne holding. It is a flexible program and may be

implemented in various forms depending upon the

needs of the AT system. Ground delay programs

provide for equitable assignment of delays to all

system users.

GROUND SPEED− The speed of an aircraft relative

to the surface of the earth.

GROUND STOP (GS)− The GS is a process that

requires aircraft that meet a specific criteria to remain

on the ground.  The criteria may be airport specific,

airspace specific, or equipment specific; for example,

all departures to San Francisco, or all departures

entering Yorktown sector, or all Category I and II

aircraft going to Charlotte.  GSs normally occur with

little or no warning.

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