Glossary

Look up acronyms, technical terms and phrases to find out what they mean.

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HVDF

Definition
High and very high frequency direction finding stations (at the same location)
Glossary Communication Source: AIS

HVY

Definition
Heavy (used to indicate the intensity of WX phenomena, eg HVY RA = heavy rain)
Glossary Meteorology Source: AIS

HX

Definition
No specific working hours (NOTAM or ERSA)
Glossary Communication Source: AIS

HYR

Definition
Higher
Glossary Measurement Source: AIS

HZ

Definition
Haze
Glossary Meteorology Source: AIS

HZ (hz)

Definition
Hertz
Glossary Measurement Source: AIS

HZS

Definition
Horizontal Surface
Glossary Measurement Source: AIS

IA

Definition
Inspection authorisation
Glossary Airworthiness Source: AIS

IAC

Definition
Instrument approach chart (followed by name/title)
Glossary Publications and charts Source: FAR

IAF

Definition
Initial Approach Fix
Glossary Navigation Source: ICAO

IAL

Definition
Instrument Approach and Landing Chart
Glossary Publications and charts Source: AIS

IAO

Definition
In and out of clouds
Glossary Meteorology Source: AIS

IAP

Definition
Instrument Approach Plate
Glossary Instrument flight rules Flight planning Source: AIS

IAR

Definition
Intersection of air routes
Glossary Instrument flight rules Flight planning

IAS

Definition
Indicated air speed
Glossary Measurement Source: ICAO
Online version available at: https://www.casa.gov.au//resources-and-education/glossary
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