VOR OTS UFN: even for the majority of /G fliers, pilots must know which VORs are offline when cruising IFR. At least, that's what the rules say.

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VOR OTS UFN: even for the majority of /G fliers, pilots must know which VORs are offline when cruising IFR. At least, that's what the rules say.(CHART CLINIC)(Very High Frequency Omni-directional Radio-range Out of Service Until Further Notice)

Publication: IFR
Publication Date: 01-JUL-07

Format: Online
Delivery: Immediate Online Access

Article Excerpt
Out of service (OTS) is a fairly common phrase in NOTAMs. Sometimes a device is taken out of service for maintenance, and the NOTAM is issued in advance with a specified timeframe for being down. Other times something takes the afternoon off without warning and the NOTAM is "until further a a...

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...notice" (UFN).

Normally when NAVAID signal goes out of tolerance, sensors detect the anomaly and automatically shut the station off. The theory is that no signal is better than misleading one. An alarm rings somewhere (FSS, tower, etc.) to alert ATC and the maintenance people that a NAVAID has resigned from Federal service.

Often there is an automatic re start sequence that...

NOTE: All illustrations and photos have been removed from this article.

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