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Which statement is correct with respect to the different types of VOR?
  • A
    A DVOR is less accurate than a CVOR.
  • B
    A VOT is located along an airway with the purpose to provide an in-flight check of the airborne equipment.
  • C
    A CVOR is primarily used for instrument approaches.
  • D
    A TVOR has a limited range.

VOR Applications

VORs are used for en-route navigation, usually to define airway centrelines.
The overall required accuracy of the displayed information is ± 5°.
When European airways were first plotted out a lower accuracy of ± 7.5° was assumed.
To keep an aircraft within the confines of an airway 10NM, maximum distance between the beacons was calculated to be 80NM.

VOR can be classified as follow:

A Terminal VOR (TVOR) is a low power beacon used as part of an airfield approach. TVORs share the lower frequencies with ILS.

A Broadcast VOR is usually a terminal aid with a voice broadcast giving out the airfield weather (ATIS) superimposed on the carrier wave.

A Test VOR (VOT) is a very low power beacon sited at airfields.
It puts out a constant phase difference of zero in all directions. This allows aircraft to test the accuracy of their equipment on the ground.
The VOR test function is selected with a course of 000° set.
The Course Deviation Indicator should centre with FROM indicated, the RMI should indicate 180° QDM. The beacon ident for a test VOR is a series of dots.

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