| | Title | Definition |
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| GPWS | Ground Proximity Warning System. |
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| Ground speed | Actual speed of aircraft over ground. May be greater or less than airspeed, according to wind. |
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| Hazard | Any real or potential condition that can cause injury, illness, or death to personnel; damage to or loss of a system, equipment or property; or damage to the environment [MIL-STD-882D]].
A hazard is a prerequisite condition that can develop into an accident through a sequence of failures, events and actions in the process of meeting an objective [Kritzinger, Ch6]].
A set of conditions in the operation of a product with the potential for initiating or contributing to events that could result in personal injury, damage to property or harm to the environment. |
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| Hazard Analysis (HA) | A generic term describing a whole collection of techniques whose combined strengths have a good chance of revealing most of the hazards. The techniques chosen depend upon the industry, stage of the project, the information available and the complexity and criticality of the equipment. |
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| Hazardous Material | Any substance that, due to its chemical, physical, or biological nature, causes safety, public health, or environmental concerns that would require an elevated level of effort to manage [MIL-STD-882D]. |
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| HDG | Heading. |
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| HDG/SEL | Heading Selector. |
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| Heavy | Added to the end of the callsign of any aircraft with a max takeoff weight of over 255,000 pounds in the United States. Aircraft currently in service in the United States which are considered heavy are Boeing 707,747,767,767. Airbus A300, A310, A330, A340. Lockheed L-1011. McDonnell Douglas DC-8, DC-10, MD-11. |
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| HF (High (radio) Frequency) | Radio propagation in the frequency band from 3 to 30 MHz. Permits communication over long distances, but reception can be subject to atmospheric and electrical interference. Used by aircraft operating beyond range of VHF and UHF radio propagation. |
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| Highly Integrated | Refers to systems that perform or contribute to multiple aircraft level functions |
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| Hindsight bias | There is almost no human action or decision that cannot be made to look flawed and less sensible in the misleading light of hindsight. It is essential that the critic should keep himself constantly aware of that fact. [Hidden, A. (Chairman), pg. 147] The phenomenon is so common that it has been given a name hindsight bias. |
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| HSI (Horizontal Situation Indicator) | Instrument on the pilot's flight instrument panel capable of displaying position information in ILS, VOR or NAV modes. When selected in NAV mode, displays distance to the next waypoint in top left hand corner, ground speed top right hand corner, and plan view of aircraft's position left or right of track, thus providing instant information on aircraft's position and speed. |
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| IADC | International Association of Defense Counsel |
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| IFR (Instrument Flight Rules) | Stipulated procedures for navigating aircraft by reference to cockpit instruments and radio navigation aids alone. Enables flight regardless of visibility. Normal operating procedure for airline flights. |
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| IHSS | International Helicopter Safety Seminar |