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 Date: 01-JUL-07
Publication Title: IFR
Format: Online

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Description

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 notice" (UFN).

Normally when a 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 a 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...

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