|
Contraction |
Definition |
Usage |
|
H24
|
continuous 24hour 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
|
|
HAZMAT |
hazardous material |
ICAO
|
|
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
|
|
HEAD
|
Head
of State status |
ICAO
|
|
HEL
|
helicopter |
ICAO
|
|
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
|
ICAO
|
|
HRZN
|
horizon |
GEN
|
|
HS
|
service available during scheduled
operations |
ICAO
|
|
HTN
|
heterodyne |
GEN
|
|
HTR
|
heater |
GEN
|
|
HUM
|
humanitarian mission |
ICAO
|
|
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
|
