4 TYPES OF VOR CHECKS

Your airplanes VOR received must be checked every 30 days for IFR Operations and there are multiple ways pilot's can check their VORs. How are they performed? What do you need to annotate?


Here's what you need to know.

VOR Checks:

VOR Receivers are required to be checked every 30 days for IFR Flight Operations. However, it is also important for VFR Pilot’s to check their aircraft’s VOR Receivers.

What to Write (SLED)

Signature (of pilot performing the check)

Location (of the check)

Error (amount of error detected during check)

Date (of the check)

VOT (VOR Test Facility)

A VOT is coded to emit the 360 Radial in all directions around the facility.

This means the airplane’s VOR Receiver should read either: 360 FROM or 180 TO, regardless of the aircraft’s location in relation to the VOR.

How the check is done:

  1. Tune and Identify the VOT.

  2. Twist the OBS Knob to center the CDI Needle.

  3. Check for proper TO/FROM Indication.

  4. The radial selected must be within:

  5. +/- 4 degrees of 360 or 180.


Ground Check

With a VOR Ground Check:

  • The Pilot must park the airplane in the designated ground spot.

  • The Pilot must tune and identify the correct VOR.

  • The Pilot must use the ground check sign to know:

  • Which radial he/she should be on.

  • Whether he/she should have a TO or a FROM Indication.

How the check is done:

  1. Park aircraft in designated check spot.

  2. Tune and Identify the Correct VOR.

  3. Twist the OBS Knob to center the CDI Needle.

  4. Check for proper TO/FROM Indication.

  5. The radial selected must be within:

  6. +/- 4 degrees of Designated Radial.


Airborne Check

With an Airborne VOR check:

  • The Pilot must position the airplane over the designated location.

  • The Pilot must tune and identify the correct VOR.

  • The Pilot must use the information in the Chart Supplement to know:

  • Which radial he/she should be on.

  • Whether he/she should have a TO or a FROM Indication.

How the check is done:

  1. Position aircraft over designated check spot.

  2. Tune and Identify the Correct VOR.

  3. Twist the OBS Knob to center the CDI Needle.

  4. Check for proper TO/FROM Indication.

  5. The radial selected must be within:

  6. +/- 6 degrees of Designated Radial.


Dual VOR Check

With a Dual VOR check, the airplane must be equipped with 2 VOR Receivers.

How the check is done:

  1. The pilot tunes both VOR Receivers to the same VOR.

  2. The pilot centers both CDI Needles.

  3. Check for proper TO/FROM Indications.

  4. With both CDI Needles Centered:

  5. The Selected Radials should be within 4 degrees of each other.


VOR Check Summary:

  • VOT = +/- 4

  • Ground Check = +/- 4

  • Airborne Check = +/- 6

  • Dual Check = within 4 degrees of each other


Author - Nate Hodell

CFI/CFII/MEI/ATP - Creator of wifiCFI - Owner of Axiom Aviation Flight School.


This information is included in the Navigation Aids: VOR Lessons on wifiCFI. Sign up today to watch videos, listen to podcasts, take lesson quizzes, join live webinars, print lesson quicktakes, and more by clicking this link >


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