| 1 | Heavy (in the context of wake turbulence categories) | H |
|---|
| 2 | High | H |
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| 3 | Height Above Touchdown | HAT |
|---|
| 4 | Hazardous Material | HAZMAT |
|---|
| 5 | High Bandwidth Connectivity System | HBCS |
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| 6 | Heading | HDG |
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| 7 | Horizontal Deviation Indicator | HDI |
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| 8 | Human Factors Engineering[10] | HFE |
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| 9 | Human Factors and Ergonomics Society | HFES |
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| 10 | Hover In Ground Effect | HIGE |
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| 11 | High Intensity Runway lighting | HIRL |
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| 12 | High Intensity Runway Operation | HIRO |
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| 13 | High Intensity Radio Transmission Area | HIRTA |
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| 14 | Hazardous Inflight Weather Advisory Service | HIWAS |
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| 15 | Height loss | HL |
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| 16 | hold | HLD |
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| 17 | hydraulic motor generator | HMG |
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| 18 | hydro-mechanical unit | HMU |
|---|
| 19 | Hover Out of Ground Effect | HOGE |
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| 20 | human-powered aircraft | HPA |
|---|
| 21 | high pressure compressor | HPC |
|---|
| 22 | high pressure turbine | HPT |
|---|
| 23 | high pressure turbine active clearance control | HPTACC |
|---|
| 24 | horizontal situation indicator | HSI |
|---|
| 25 | head-up display | HUD |
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| 26 | Human Remains | HUM |
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| 27 | headwind | HW |
|---|
| 28 | hydraulic | HYD |
|---|
| 29 | hydraulic interface module | HYDIM |
|---|
