备降（diversion）：飞机（航空器）在飞行过程中不能或不宜飞往飞行计划中的目的地机场或目的地机场不适合着陆，而降落在其他机场的行为称为备降。
备降场 alternate ; alternative landing field ; departure alternate ; Alternate airport
备降机场 Alternate airport ; alternate aerodrome ; ALTN ; alternate airfield
主备降机场 master diversion field
无备降场点 point of nobalternate
备降机场天气预报 alternate forecast
起飞备降机场 take-off alternate
准备降落 Landing
升降设备 Lifts ; Elevating apparatus ; jacking equipment ; Elevating Equipments ; lifting appliance
驾驶员将客机安全降落在备降机场上。
如果事情发生在飞机起飞不久，他们可能会备降。
If it happened early in the flight they could have wound up diverting the flight.
我们将试做盲降进入，如不成功，我们将选择上海做备降场。
We'll make a trial (try) on ILS approach, if we can't make it, we'll take SHA as alternate (we will divert to SHA).
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