![]() Federal Aviation Regulations ( 14 CFR Section 91.171) provides for certain VOR equipment accuracy checks prior to flight under instrument flight rules.No correction other than the correction card figures supplied by the manufacturer should be applied in making these VOR receiver checks.Yearly intervals are recommended at which time an authorized repair facility should recalibrate the receiver to the manufacturer's specifications.The best assurance of having an accurate receiver is periodic calibration.The likelihood of this deterioration varies between receivers, and is generally considered a function of time.If a receiver's Automatic Gain Control or modulation circuit deteriorates, it is possible for it to display acceptable accuracy and sensitivity close into the VOR or VOT and display out-of-tolerance readings when located at greater distances where weaker signal areas exist.Periodic VOR receiver calibration is most important:.The airborne use of VOT is permitted however, its use is strictly limited to those areas/altitudes specifically authorized in the Chart Supplement U.S. ![]() The FAA VOR test facility (VOT) transmits a test signal which provides users a convenient means to determine the operational status and accuracy of a VOR receiver while on the ground where a VOT is located.The frequency channels of the VOR and the TACAN at each VORTAC facility are "paired" in accordance with the national plan to simplify airborne operation.Transmitting signals of VOR and TACAN are each identified by three-letter code transmission and are interlocked so that pilots using VOR azimuth with TACAN distance can be assured both signals being received are definitely from the same ground station.Both components of a VORTAC are envisioned as operating simultaneously and providing the three services at all times.Although consisting of more than one component, incorporating more than one operating frequency, and using more than one antenna system, a VORTAC is considered to be a unified navigation aid.A VORTAC is a facility consisting of two components, VOR and TACAN, which provides three individual services at a central location:.VHF Omni-Directional Range/Tactical Air Navigation (VORTAC): Adjusted through the use of the Omni-Bearing Selector (OBS) knob.At 60 NM out, one dot is 2 NM displacement two dots, 4 NM.At 30 NM out, one dot is 1 NM displacement two dots, 2 NM.Airplane displacement from a course is about 200' per dot per NM.Example: At Monroeville VOR, you will transmit on 122.1 and receive on 116.8.An R indicates you transmit on that frequency and listen on the VOR frequency.If your equipment automatically decodes the identifier, it is not necessary to listen to the audio identification.You should be familiar with your equipment and use it appropriately.Some VOR equipment decodes the identifier and displays it to the pilot for verification to charts, while other equipment simply displays the expected identifier from a database to aid in verification to the audio tones.The transmission consists of a voice announcement, "AIRVILLE VOR" alternating with the usual Morse Code identification.VORs without voice capability are indicated by the letter "W" (without voice) included in the class designator (VORW) as shown below as published in the Chart Supplement U.S.Most VORs are equipped for voice transmission on the VOR frequency.In some cases, none of the VORs have the name of the "parent" FSS.Many FSSs remotely operate several omni-ranges with different names.Reliance on determining the identification of an omni-range should never be placed on listening to voice transmissions by the Flight Service Station (FSS) (or approach control facility) involved.-) code may radiate or the code / voice may be removed.During periods of maintenance a T-E-S-T code (.Must identify a VOR with a Morse code identifier and/or with a recorded automated voice identifier by the word "VOR" following the range's name prior to use for navigation.The area directly over a VOR may cause erroneous indications and is referred to as the Cone of Confusion.Emits 2 signals, one for each 360° and another aligned with true north combined they give an indication on the instrument.VORs can be found on navigational charts, depicted in.
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