PAPI | string
| Precision approach path indicator. |
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APAPI | string
| Abbreviated precision approach path indicator. |
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HAPI | string
| Helicopter approach path indicator. |
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VASIS | string
| Visual approach slope indicator system. |
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AVASIS | string
| Abbreviated visual approach slow indicator system. |
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TVASIS | string
| T-shaped VASIS |
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ATVASIS | string
| Abbreviated TVASIS |
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3B_VASIS | string
| 3 bar VASIS. |
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3B_AVASIS | string
| 3 bar AVASIS |
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3B_ATVASIS | string
| 3 bar ATVASIS. |
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PVASI | string
| Pulsating/steady burning visual approach slope indicator, normally a single light unit projecting two colours. |
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TRCV | string
| Tri-colour visual approach slope indicator, normally a single light unit projecting three colours. |
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PNI | string
| Alignment of elements system. |
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ILU | string
| A number of identical light units. |
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OLS | string
| Optical landing system for strip decks and aircraft carriers (sometimes available on ground air bases for training purposes). |
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LCVASI | string
| Low cost visual approach slope indicator: 3 sets of 4 white lights on 3 mounts usually on only one side of the runway. |
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OTHER | string
| Other type of visual approach slope indicator. |
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