FAA-H-8083-16B

Question 1

Acceptable VOR tolerance

Answer 1

1. Ground checkpoint: The maximum permissible difference between
   aircraft equipment and the designated radial is 4° i
   and 0.5 NM of the posted distance.
2. Airborne: VOR equipment can also be checked for accuracy while in
   fight by flying over a fix or landmark located on a published
   radial and noting the indicated radial. Variances of more
   than 6° from the published radial should be considered out
   if tolerance and not be used for IFR navigation.