When using VOT to make a VOR receiver check, what should the CDI indicate?

When using a VOT (VOR Test Facility) to check the accuracy of a VOR receiver, the correct indication on the Course Deviation Indicator (CDI) should reflect that the aircraft is aligned with the VOR's reference radial—in this case, the 360 radial. A VOT is a ground-based facility designed to provide a known signal for testing VOR receivers, and when a pilot tunes a VOR receiver to a VOT station, a proper reading on the CDI will confirm the accuracy of the receiver.

The CDI will center when the aircraft is pointed directly towards the VOT, which is effectively broadcasting a signal based on a known and precise radial. For a VOT, the standard check indicates that if the aircraft is on the 360 radial (essentially flying straight towards the VOR), the CDI will show a full deflection to the right (from the VOT's perspective). This ensures that the aircraft’s VOR receiver is functioning correctly by verifying that it produces the expected display that corresponds with the VOT signal.

Given this rationale, when checking the VOR receiver against a VOT, a centered CDI indicates that the receiver is correctly tuned and functioning, affirming the data reliability for navigation purposes.