GUI Graphic/User Interface
GVE Graphics Vector Engine
GWS Graphical Weather Services
Gyroscope A rotating device that will maintain its original plane
of rotation,no matter which direction the gyroscope
mount is turned.
H
HDBK Handbook
HDG Heading
HDLC High Level Data Link Control
HDOP Horizontal Dilution Of Precision
HDP Hardware Development Plan
Heading The direction of an aircraft path with respect to mag-
netic or true north.
HF High Frequency. The portion of the radio spectrum
from 3 to 30 MHz. HF communication systems oper-
ate in the 2 to 30 MHz portion of the spectrum.
HFDL High-Frequency Data Link
HFS High-Frequency System
HGA High Gain Antenna
HHLD Heading Hold
HIL Horizontal Integrity Limit
HIRF High Intensity Radiated Field
HLCS High Lift Control System
HLE Higher Layer Entity
HLL High Level Language
HMI Human Machine Interface
HMOS High Density Metal Oxide Semiconductor
HOW Hand-Over Word
HP High Pressure
HPA High Power Amplifier
hPa hecto Pascal
HPC High Pressure Compressor
H-Plane The H-Plane is the plane in which the magnetic field
of the antenna lies. The H-Plane is perpendicular to
the E-Plane.
HPR High Power Relay
HPSOV High Pressure Shutoff Valve
HPT High Pressure Turbine
HSI Horizontal Situation Indicator. An indicator that dis-
plays bearing,glideslope,distance, radio source,
course and heading information.
HSL Heading Select
HSR High Stability Reference
HUD Heads Up Display
HVPS High Voltage Power Supply
HW Hardware
HX Heat Exchanger
HYD Hydraulic
HYDIM Hydraulic Interface Module
Hz Hertz (cycles per second)
I
IACSP International Aeronautical Communications Service
Provider
IAF Initial Approach Fix
38
IAOPA International Council of Aircraft Owners and Pilots
IAP Instrument Approach Procedure
IAPS Integrated Avionics Processing System
IAS Indicated Air Speed
IATA International Air Transport Association
IC (1) Intercabinet
(2) Integrated Circuit
ICAO International Civil Aviation Organization (Montreal)
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