|
Contraction
|
Definition
|
Usage
|
|
H24
|
continuous 24-hour service
|
ICAO
|
|
HAA
|
height above airport
|
GEN
|
|
HADA
|
Hawaiian Defense Area
|
GEN
|
|
HADD
|
Hawaiian Air Defense Division
|
GEN
|
|
HADIZ
|
Hawaiian Air Defense Identification Zone
|
GEN
|
|
HAL
|
height above landing
|
GEN
|
|
HANG
|
Hawaiian Air National Guard
|
GEN
|
|
HAPI
|
holding as previously instructed
|
ATC
|
|
HARS
|
hazardous area reporting service
|
ATC
|
|
HAT
|
height above touchdown
|
GEN
|
|
HAZ
|
hazard
|
GEN
|
|
HB
|
homing beacon
|
ATC
|
|
HBN
|
hazard beacon
|
ICAO
|
|
HCVIS
|
high clouds visible
|
NWS
|
|
HDATZ
|
high density traffic zones
|
ATC
|
|
HDF
|
high frequency direction finding station
|
ICAO
|
|
HDFRZ
|
hard freeze
|
NWS
|
|
HDG
|
heading
|
ICAO
|
|
HDOP
|
Horizontal Dilution of Precision
|
ATC
|
|
HDSVLY
|
Hudson Valley
|
NWS
|
|
HDTA
|
high density traffic airport
|
GEN
|
|
HDWND
|
headwind
|
ATC
|
|
HEL
|
helicopter
|
GEN
|
|
HELI
|
heliport
|
GEN
|
|
HF
|
high frequency
|
GEN
|
|
HFR
|
hold for release
|
ATC
|
|
HGT
|
height
|
GEN
|
|
HHE
|
household effects
|
GEN
|
|
HI
|
high
|
NWS
|
|
HIALS
|
high intensity approach light system
|
GEN
|
|
HIBAL
|
high altitude balloon
|
GEN
|
|
HIEAT
|
highest temperature equaled for all time
|
NWS
|
|
HIEFM
|
highest temperature equaled for the month
|
NWS
|
|
HIESE
|
highest temperature equaled so early
|
NWS
|
|
HIESL
|
highest temperature equaled so late
|
NWS
|
|
HIFOR
|
high level forecast
|
NWS
|
|
HIRIV
|
how will arrival report be filed concerning
|
ATC
|
|
HIRL
|
high intensity runway lights
|
GEN
|
|
HITMP
|
highest temperature
|
NWS
|
|
HIWAS
|
hazardous inflight weather advisory service
|
GEN
|
|
HIXAT
|
highest temperature exceeded for all time
|
NWS
|
|
HIXFM
|
highest temperature exceeded for the month
|
NWS
|
|
HIXSE
|
highest temperature exceeded so early
|
NWS
|
|
HIXSL
|
highest temperature exceeded so late
|
NWS
|
|
HJ
|
sunrise to sunset
|
ICAO
|
|
HLDG
|
holding
|
ICAO
|
|
HLF
|
half
|
GEN
|
|
HLSTO
|
hailstones
|
NWS
|
|
HLTP
|
hilltop
|
NWS
|
|
HN
|
sunset to sunrise
|
ICAO
|
|
HND
|
hundred
|
GEN
|
|
HNGR
|
hangar
|
GEN
|
|
HO
|
service available to meet operational requirements
|
ICAO
|
|
HOL
|
holiday
|
GEN
|
|
HOP
|
handoff point
|
ATC
|
|
HOP
|
helicopter operations
|
GEN
|
|
HOSP
|
hospital aircraft
|
ICAO
|
|
HOW
|
handover word
|
ATC
|
|
HP
|
holding pattern
|
GEN
|
|
HPA
|
hectopascal
|
ICAO
|
|
HQ
|
headquarters
|
GEN
|
|
HR
|
here
|
GEN
|
|
HR
|
hour
|
GEN
|
|
HRZN
|
horizon
|
GEN
|
|
HS
|
service available during scheduled operations
|
ICAO
|
|
HTN
|
heterodyne
|
GEN
|
|
HTR
|
heater
|
GEN
|
|
HURCN
|
hurricane
|
NWS
|
|
HUREP
|
hurricane report
|
NWS
|
|
HV
|
high voltage
|
GEN
|
|
HVDF
|
high and very high frequency direction finding stations
|
ICAO
|
|
HVY
|
heavy
|
GEN
|
|
HWVR
|
however
|
GEN
|
|
HWY
|
highway
|
GEN
|
|
HX
|
high index
|
NWS
|
|
HX
|
no specific working hours
|
ICAO
|
|
HYD
|
hydraulic
|
GEN
|
|
HYDRO
|
hydrographic
|
GEN
|
|
HYR
|
higher
|
ICAO
|
|
HZ
|
haze
|
METAR
|
|
Hz
|
hertz
|
GEN
|