Aerospace Acronyms: H
| Acronym | Definition |
|---|---|
| H24 | Continuous round-the-clock operation. Also :- HN, HJ, HO |
| HJ | Operates during day. |
| HN | Operates during night. |
| HO | Operates during times to meet operational requirements. |
| HX | No specific operational hours. |
| HAA | Historic Aircraft Association. |
| HAI | Helicopter Association International. |
| Half-mill(ion) | 1:500000 scale ICAO aeronautical chart. |
| HDG | Heading. The direction in which an aircrafts nose points in flight in the horizontal plane expressed in compass degrees. |
| Heavy | Suffix used in RT callsigns to indicate that the aircraft is a large transport alerting controllers and following aircraft to the possibility of wake turbulence (which see). |
| Hectopascal (hPa) | Unit of pressure measurement. |
| HEMS | Helicopter Emergency Medical Services. |
| Hertz | Standard radio equivalent of frequency in cycles per second. |
| HF | High-Frequency Band. |
| Hg | Inches of mercury a unit of pressure measurement. |
| HIAL | High Intensity Approach Lighting. |
| HIRF | High Intensity Radiated (Electromagnetic) Fields. |
| HIRL | High Intensity Runway Lighting. |
| HISL | High Intensity Strobe Light. |
| Holding Pattern | Set path which keeps aircraft within a specified airspace while awaiting further clearance from air traffic control. |
| Hot-And-High | Airfield conditions of high altitude and high ambient temperatures. |
| HOTAS | Hands On Throttle And Stick. |
| HRA | Highlands Restricted Area |
| HSI | Horizontal Situation Indicator. A cockpit navigation display combining navigation and heading. |
| HUD | Head-Up Display. Aircraft data projected on to the pilots aircraft windscreen. |
