请准备好备用机场。
备用机场，当不可能或不适宜在预选机场着陆时，可作着陆使用的场机。
ALTERNATE aerodrome, an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or land at the aerodrome of intended landing.
备用机场，当不可能或不适宜在预选机场着陆时，可作着陆使用的场机。
ALTERNATE aerodrome, an aerodrome to which an aircraft may proceed when it becomes either impossible or inadvisable to proceed to or land at the aerodrome of intended landing.
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