GATE HOLD PROCEDURES-
Procedures at selected airports to hold aircraft at the gate or other ground
location whenever departure delays exceed or are anticipated to exceed 15
minutes. The sequence for departure will be maintained in accordance with
initial call-up unless modified by flow control restrictions. Pilots should
monitor the ground control/clearance delivery frequency for engine start/taxi
advisories or new proposed start/taxi time if the delay changes.
(See GROUND CONTROLLED
(See GROUND DELAY PROGRAM.)
That portion of civil aviation that does not include
scheduled or unscheduled air carriers or commercial space operations.
(See ICAO term GENERAL
GENERAL AVIATION [ICAO]-
All civil aviation operations other than scheduled air services and nonscheduled
air transport operations for remuneration or hire.
GEO MAP- The digitized map
markings associated with the ASR-9 Radar System.
GLIDEPATH [ICAO]- A
descent profile determined for vertical guidance during a final approach.
(See GLIDESLOPE INTERCEPT
vertical guidance for aircraft during approach and landing. The glideslope/glidepath
is based on the following:
components emitting signals which provide vertical guidance by reference to
airborne instruments during instrument approaches such as ILS/MLS, or
b. Visual ground
aids, such as VASI, which provide vertical guidance for a VFR approach or for
the visual portion of an instrument approach and landing.
c. PAR. Used by ATC
to inform an aircraft making a PAR approach of its vertical position (elevation)
relative to the descent profile.
(See ICAO term GLIDEPATH.)
ALTITUDE- The published minimum altitude to
intercept the glideslope in the intermediate segment of an
instrument approach. Government charts use the
lightning bolt symbol to identify this intercept point.
This intersection is called the Precise Final Approach
fix (PFAF). ATC directs a higher altitude, the
resultant intercept becomes the PFAF.
(See FINAL APPROACH FIX.)
(See SEGMENTS OF AN
INSTRUMENT APPROACH PROCEDURE.)
GLOBAL NAVIGATION SATELLITE SYSTEM
(GNSS) [ICAO]— A worldwide position and time determination system that includes
one or more satellite constellations, aircraft receivers and system integrity
monitoring, augmented as necessary to support the required navigation
performance for the intended operation.
NAVIGATION SATELLITE SYSTEM
Minimum En Route IFR
Altitude (GNSS MEA)—
The minimum en route IFR altitude on a published ATS route or route segment
which assures acceptable Global Navigation Satellite System reception and meets
obstacle clearance requirements.
(Refer to 14 CFR Part 91.)
(Refer to 14 CFR Part 95.)
GLOBAL POSITIONING SYSTEM
(GPS)- A space-base radio positioning, navigation, and time-transfer system. The
system provides highly accurate position and velocity information, and precise
time, on a continuous global basis, to an unlimited number of properly equipped
users. The system is unaffected by weather, and provides a worldwide common grid
reference system. The GPS concept is predicated upon accurate and continuous
knowledge of the spatial position of each satellite in the system with respect
to time and distance from a transmitting satellite to the user. The GPS receiver
automatically selects appropriate signals from the satellites in view and
translates these into three-dimensional position, velocity, and time. System
accuracy for civil users is normally 100 meters horizontally.
Proceed with your message. Not to be used for any other purpose.
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 MISSED APPROACH.)
(See GRAPHIC PLAN DISPLAY.)
(See GLOBAL POSITIONING
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
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
GROUND-BASED TRANSCEIVER (GBT)-
The ground-based transmitter/receiver (transceiver) receives 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
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.
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.
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 nonprecision radar approach is
(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.
(See GROUND STOP.)