Thread: Abc Vor U/s
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Old 09-11-2010 | 05:26 AM
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From: Engines Turn or People Swim
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Originally Posted by maddog81
ABC unmonitored means that it is not possible to use that navaid for the purpuse of an alternate. This is why the alternate requirements for a lot of part time towers will say "N/A as alt when XYZ tower is closed" because the tower monitors the navaid locally.
Unmonitored also means you should not use it as the principle navaid for IFR period.
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