What indication should the OBS display when using VOT to make a VOR receiver check?

When conducting a VOR receiver check using a VOT (VHF Omnidirectional Range Test Facility), the correct indication on the OBS (Omni Bearing Selector) should read 360 degrees. This is essential for validating that the VOR receiver is functioning correctly.

In this check, the procedure entails tuning the VOR receiver to the VOT frequency, which transmits a known signal. Pilots should then adjust the OBS to indicate 360 degrees. At this setting, the VOR receiver should indicate a from indication, confirming that the receiver is accurately tuned and properly aligned.

The reasoning behind this standardization ensures that pilots can verify the accuracy of their navigation equipment in a uniform manner. If the readout doesn't align with the expected 360-degree indication when tuned to VOT, it signals that there may be an issue with the VOR receiver, necessitating further checks or maintenance. This process helps enhance flight safety by ensuring navigational equipment is dependable and precise.