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| h |
Hour |
| HAAC |
Helicopter air-to-air combat |
| HAARS |
High-altitude airdrop resupply system |
| HADAS |
Helmet airborne display and sight |
| HADS |
Helicopter air data system |
| HALE |
High altitude, long endurance |
| HALO |
High altitude, low observable |
| also: |
High altitude, low opening (parachute) |
| HAR |
Helicopter, search and rescue (UK) |
| hardened |
Affording maximum protection against effects of
nuclear blast |
| hard point |
Reinforced load bearing to which weapons or
stores can be attached |
| HARS |
Heading and attitude reference
system |
| HAS |
Hardened aircraft shelter |
| HASC |
House Armed Services Committee (US) |
| HC |
Helicopter, cargo (UK) |
| HDD |
Head down display; display on cockpit instrument
panel |
| HDG |
Heading |
| HDU |
Hose drum unit; inflight refueling equipment |
| HE |
High explosive |
| HEL |
High energy laser |
| also: |
Helicopter |
| helicopter |
Rotary-wing aircraft in which engine power is
applied to a horizontal rotor(s) which provide both lift and propulsion |
| HF |
High frequency |
| HIFR |
Hover inflight refueling equipment |
| HI-LO-HI |
Mission profile with high altitude ingress,
low-level attack and high altitude egress |
| HMD |
Helmet mounted display |
| HMG |
Her Majesty's Government (UK) |
| HMS |
Helmet mounted sight |
| also: |
Her Majesty's Ship (RN) |
| HOCAC |
Hands on cyclic and collective (helicopters) |
| homebuilt |
Aircraft designed to be built or assembled from
plans or a kit by an amateur constructor; re:
kitbuilt |
| hot and high |
Combination of high temperature and high
altitude which has a detrimental effect on performance |
| HOTAS |
Hands on throttle and stick; describes location
of controls on fighter aircraft |
| hovering ceiling |
Altitude at which rate of climb of a helicopter
becomes zero |
| hp |
Horsepower |
| HP |
High pressure |
| HPC |
High pressure compressor (jet engine) |
| HPT |
High pressure turbine (jet engine) |
| HQ |
Headquarters |
| hr |
Hours |
| HS |
Helicopter Squadron (USAF) |
| HSD |
Horizontal situation display |
| HSI |
Horizontal situation indicator |
| HSS |
Helicopter support ship |
| HST |
Hypersonic transport |
| HUD |
Head-up display |
| HUDWAC |
HUD weapon aiming computer |
| HUDWASS |
HUD weapon aiming sub-system |
| HUMS |
Health and usage monotiring system |
| HVAR |
High velocity aircraft rocket |
| HYD |
Hydraulics |
| Hz |
Hertz; cycles per second |