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| 主表面 (有关跑道的纵向居中的矩形面。它的宽度是可变的，当跑道有特别准备的硬表面时，它通常都在每一个跑道端外延伸200 ft (60m )。而当跑道没有特别准备的或计划的硬表面时，主表面就在跑道的每一端结束。在主表面上的任何一点的高程与跑道中心线或延长线的最靠近点的高程相一致) | |||
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| primary surface: 5 phrases in 5 subjects |
| Automobiles | 1 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Nautical | 1 |
| Refrigeration | 1 |
| Technology | 1 |
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