VOR Checks Flashcards
What are airborne or ground VOR check points?
Airborne and ground check points consist of certified radials that should be received at specific points on
the airport surface or over specific landmarks while airborne in the immediate vicinity of the airport.
Can a VOR Test Facility (VOT) be used to conduct VOR checks while airborne?
The airborne use of VOT is permitted; however, its use is strictly limited to those
areas/altitudes specifically authorized in the A/FD or appropriate supplement.
If VORs are tested against each other during an airborne VOR check, what can the maximum difference
between the two be?
If a dual system VOR (units independent of each other except for the antenna) is installed in the aircraft, one
system may be checked against the other. Turn both systems to the same VOR ground facility and note the
indicated bearing to that station. The maximum permissible variations between the two indicated bearings
is 4 degrees
as per CFR 14 Part 91.171.
How does a pilot perform a VOR operational check?
A pilot may check VOR accuracy in one of four ways.
- VOT or a radiated test signal from an appropriately rated radio repair station.
- Certified airborne check points.
- Certified check points on the airport surface.
- If a dual VOR system exists, they may be checked against each other.
How do you do a VOT check
To use a VOT station, tune in the VOT frequency on your VOR receiver. Center the CDI on the receiver. The
VOR indicator should read 0 degrees with a FROM indication, or 180 degrees with a TO indication. The
acceptable error for a VOT check is +/- 4 degrees.
How do you do a ground or airborne check?
To use a ground or airborne certified VOR check point, position the aircraft over the point. Tune and identify the VOR station and select the appropriate radial. Acceptable tolerances are +/- 4 degrees on the
ground, +/- 6 degrees in the air.
How do you check VORs against one another?
To check one VOR against the other, turn both systems to the same VOR ground facility and note the
indicated bearing to that station. The maximum permissible variations between the two indicated bearings
is 4 degrees.
What information must be entered in the logs for a VOR check?
Each person making the VOR operational check shall enter the date, place, and bearing error, and sign the
aircraft log or other record.
CFR 14, Part 91.171
