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HAA high-altitude airship
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HAD hardware architecture document
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HADS high-altitude platform station
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HALE high-altitude, long-endurance
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HARS high altitude route system
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HCI human-computer interface
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HCP heads-up control panel
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HCS host computer system
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HDD head-down display
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HDG heading
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HDG SEL heading select
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HDL hybrid data link
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HDLC high-level data link control
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HDLC-B HDLC-balanced
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HDLMS hybrid data link management system
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HDMI high-definition multimedia interface
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HDOP horizontal dilution of precision
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HDP hardware development plan
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HDTV high-definition television
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HE altitude error
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HEA head equipment assembly
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HERF high-energy radio frequency (or energy radiated fields: dense)
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HF high frequency
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HF human factors
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HFACS human factors analysis and classification system
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HFDL high frequency data link
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HFDM high-frequency data modem
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HFDR high frequency data radio
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HFI human factors integration
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HFNPDU high frequency network protocol data unit
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HFS high frequency system
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HFSG human factor study group
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HFSNL high frequency subnetwork layer
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HFWG human factors working group
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HGA high gain antenna
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HGAS HGA system
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HGC head-up guidance computer
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HGS head-up guidance system
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HGS HFDL ground station
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HHLD heading hold
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HID host interface display
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HIL horizontal integrity limit
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HIRF high intensity radiated field
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HITS highway in the sky
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HLCS high lift control system
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HLE higher layer entity
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HLL high level language
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HMD helmet-mounted display
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HMI hazardously misleading information
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HMI human-machine interface
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HMOS high density metal oxide semiconductor
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HMS handheld manpack and small form fit
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HMSD Helmet Mounted Sight & Display
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HMU height monitoring unit
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HO handoff
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HOCSR host/oceanic computer system replacement
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HOTAS hands on throttle and stick
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HOW hand-over word
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HP high pressure
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HP holding pattern
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hPa hecto Pascal
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HPA high power amplifier
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HPC high pressure compressor
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HPR high power relay
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HPSOV high pressure shutoff valve
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HPT high pressure turbine
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HRD home routing domain
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HS-DSAD high speed frame relay service access device
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HSD high-speed data
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HSI horizontal situation indicator
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HSIT hardware and software integration test
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HSL heading select
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HSR high stability reference
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HSRP hot standby routing protocol
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HTC highest two-way channel
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HUD head-up display
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HUMS health and usage monitoring system
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HVPS high voltage power supply
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HWCI hardware configuration item
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HX heat exchanger
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HYD hydraulic
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HYDIM HYD interface module
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Hz Hertz (cycles per second)
