Acronyms: H

Acronym	Name
H	Non-- Directional Radio Homing Beacon (NDB)
HAA	Height Above Airport
HAA	High-altitude airship
HAATA	Houston Area Airspace Transition System
HAD	Hardware architecture document
HADDS	Host Air Traffic Management Data Distribution System
HADS	High-altitude platform station
HAE	Height above ellipsoid
HAG	Height above geoid
HAI	Helicopter Association International
HAL	Height Above Landing
HALE	High-altitude, long-endurance
HARS	High altitude route system
HART	Heterogeneous airborne reconnaissance teams (U.S. Army)
HAT	Height Above Touchdown
HAT	Height above touchdown zone
HAZMAT	Hazardous Material
HAZMAT	Hazardous Materials
HCAP	High Capacity Carriers
HCI	Human-computer interface
HCP	Heads-up control panel
HCS	Host computer system
HD	High definition
HD	High density airports
HDD	Head-down display
HDG	Heading
HDG SEL	Heading select
HDL	Hybrid data link
HDLC	High-level data link control
HDLC-B	HDLC-balanced
HDLMS	Hybrid data link management system
HDME	NDB with Distance Measuring Equipment
HDMI	High-definition multimedia interface
HDOP	Horizontal dilution of precision
HDP	Hardware development plan
HDQ	FAA Headquarters
HDR	Hardware Discrepancy Report
HDTA	High Density Traffic Airports
HE	Altitude error
HEA	Head equipment assembly
HELI	Heliport
HEMS	Helicopter Emergency Medical Service
HEMS	Helicopter Emergency Medical Services
HEMS	Helicopter emergency medical services
HERF	High-energy radio frequency (or energy radiated fields: dense)
HF	High frequency
HF	Human factors
HFACS	Human factors analysis and classification system
HFDL	High-frequency data link
HFDM	High-frequency data modem
HFDR	High frequency data radio
HFI	Human factors integration
HFNPDU	High frequency network protocol data unit
HFOM	Horizontal figure of merit
HFS	High frequency system
HFSG	Human factor study group
HFSNL	High frequency subnetwork layer
HFWG	Human factors working group
HGA	High gain antenna
HGAS	HGA system
HGC	Head-up guidance computer
HGS	HFDL ground station
HGS	Head-up guidance system
HH	NDB, 2kw or More
HHLD	Heading hold
HI-- EFAS	High Altitude EFAS
HI-EFAS	High Altitude EFAS
HID	Host interface display
HID/NAS/LAN	Host Interface Device/National Airspace System/Local Area Network
HIL	Horizontal integrity limit
HIRF	High-intensity radiated field
HIRL	High Intensity Runway Lights
HITL	Human in the loop
HITS	Highway in the sky
HLCS	High lift control system
HLDC	High Level Data Link Control
HLE	Higher layer entity
HLL	High level language
HMD	Helmet-mounted display
HMI	Hazardously misleading information
HMI	Human-machine interface
HMOS	High-density metal oxide semiconductor
HMS	Handheld manpack and small form fit
HMSD	Helmet Mounted Sight & Display
HMU	Height monitoring unit
HO	Handoff
HOCSR	Host/oceanic computer system replacement
HOGE	Hover Out of Ground Effect
HOTAS	Hands on throttle and stick
HOV	High Occupancy Vehicle
HOW	Hand-over word
HP	High pressure
HP	Holding pattern
HPA	High power amplifier
HPC	High pressure compressor
HPL	Horizontal protection limit
HPR	High power relay
HPSOV	High pressure shutoff valve
HPT	High pressure turbine
HPZ	Heliport Protection Zone

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Acronyms: H