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6 – i ndex
GS
Small Hail and/or SnowPellets
GUND GeoidUndulation
H
H
High pressure are of the centre
of high pressure (MET)
#H24
Continuous day and night
service
HAA
HeightAboveAerodrome
HAT
HeightAboveThreshold
HBN
HazardBeacon
HDG
Heading
HDS
Hours of Daylight Saving
HEL
Helicopter
#HF
HighFrequency (3000 to
30,000KHZ)
HGT
Height, Height above
+HIAL
High IntensityApproach
Lighting
HIOL
High IntensityObstacleLighting
HIRL
High IntensityRunway Lighting
#HJ
Sunrise toSunset
HLDG
Holding
HLS
Helicopter LandingSite
#HN
Sunset toSunrise
HO
ServiceAvailable tomeet
operational requirements
HOSP
Hospital Aircraft
HPA
Hectopascal
HR
Hours
HS
Homestead
HS
Service available during hours
of scheduled operations
HSL
HoldShort Lights
HURCN
Hurricane
HVY
Heavy
HVY
Heavy (used to indicate the
intensity ofWX phenomena,
egHVYRA= heavy rain)
HX
No specificworking hours
HYR
Higher
HZ
Haze
HZ
Hertz
HZS
Horizontal Surface
I
IAC
InstrumentApproachChart
(followed by name/title)
IAF
Initial ApproachFix
#IAL
InstrumentApproach and
Landing
IAO
In and out of clouds
#IAS
IndicatedAir Speed
IBN
IdentificationBeacon
abbreviations and acronyms
CODE DEFINITION
CODE DEFINITION