# VOR equipment — Aircraft inspection and test intervals under 14 CFR Part 91

For VOR equipment, interval is within the preceding 30 days; applies to is civil aircraft under IFR using the VOR system of radio navigation; consequence if lapsed is No person may operate a civil aircraft under IFR; regulation section is § 91.171, verified against its source on 2026-08-06.

- **Inspection or test item:** VOR equipment _(verified: appears in the quote below)_
- **Interval:** within the preceding 30 days _(verified: appears in the quote below)_
- **Applies to:** civil aircraft under IFR using the VOR system of radio navigation _(verified: appears in the quote below)_
- **Consequence if lapsed:** No person may operate a civil aircraft under IFR _(verified: appears in the quote below)_
- **Regulation section:** § 91.171 _(verified: appears in the quote below)_

## What the source says

> No person may operate a civil aircraft under IFR using the VOR system of radio navigation unless the VOR equipment of that aircraft— (1) Is maintained, checked, and inspected under an approved procedure; or (2) Has been operationally checked within the preceding 30 days, and was found to be within the limits of the permissible indicated bearing error set forth in paragraph (b) or (c) of this section.

## Source

- https://www.ecfr.gov/api/versioner/v1/full/2026-08-01/title-14.xml?part=91&section=91.171

Last verified: 2026-08-06. Review by: 2028-08-05.
Part of [Aircraft inspection and test intervals under 14 CFR Part 91](https://referencesource.org/aircraft-inspection-and-test-intervals/).