What is the maximum permissible variation between the dual system VORs?

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Multiple Choice

What is the maximum permissible variation between the dual system VORs?

Explanation:
Redundancy in VOR navigation relies on two receivers agreeing on the same station. When both VORs are tuned to the same beacon, their indicated radials should be very close, within a tight tolerance. The maximum permissible variation between the dual VOR readings is four degrees. This four-degree limit accounts for minor instrument and signal differences, ensuring you can trust the cross-check between the two receivers. If you see a difference greater than four degrees, you should re-check or re-tune the receivers or perform maintenance, because the readings aren’t reliable enough to support accurate navigation. For example, if one shows a 180-degree radial and the other shows between 176 and 184 degrees, you’re within tolerance; a larger split would prompt corrective action.

Redundancy in VOR navigation relies on two receivers agreeing on the same station. When both VORs are tuned to the same beacon, their indicated radials should be very close, within a tight tolerance. The maximum permissible variation between the dual VOR readings is four degrees. This four-degree limit accounts for minor instrument and signal differences, ensuring you can trust the cross-check between the two receivers. If you see a difference greater than four degrees, you should re-check or re-tune the receivers or perform maintenance, because the readings aren’t reliable enough to support accurate navigation. For example, if one shows a 180-degree radial and the other shows between 176 and 184 degrees, you’re within tolerance; a larger split would prompt corrective action.

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