A pilot is performing a VOR receiver accuracy check using a VOR test facility (VOT). The published VOT frequency is 108.00 MHz. When tuning this frequency, what radial should the pilot expect the VOR indicator to display when centered 'TO' and 'FROM' the station?
- A360° FROM and 180° TO
- B090° FROM and 270° TO
- C180° FROM and 360° TO
- D045° FROM and 225° TO
Show answer & explanationAnswer & explanation
Correct answer: C. 180° FROM and 360° TO
A VOR Test Facility (VOT) transmits a test signal that provides a 360-degree radial in all directions. When a VOR receiver is tuned to a VOT frequency and the OBS (Omnibearing Selector) is set to 180 degrees, the VOR indicator should show a 'FROM' indication with the CDI (Course Deviation Indicator) centered. Conversely, when the OBS is set to 360 degrees (0 degrees), the indicator should show a 'TO' indication with the CDI centered. Therefore, 180° FROM and 360° TO (or 0° TO) are the correct indications for a VOT check.
Why the other options are wrong
- A. This option reverses the TO/FROM indications for 180° and 360°.
- B. 090° FROM and 270° TO are not the standard indications for a VOT check.
- D. 045° FROM and 225° TO are not the standard indications for a VOT check.
VOT Accuracy Check Indications
When performing a VOR receiver accuracy check using a VOT (VOR Test Facility), the VOR indicator should display 180° FROM and 360° (or 0°) TO with the CDI centered, within a ±4° tolerance.
- VOT transmits a 360° radial.
- 180° OBS setting should show FROM and centered CDI.
- 360° (0°) OBS setting should show TO and centered CDI.
- Tolerance is ±4° for the CDI.
Memory trick: VOT: One-Eighty FROM, Three-Sixty TO.