What is the maximum distance apart for VOR navigational aids in an IFR flight plan off established airways?

The maximum distance apart for VOR navigational aids in an IFR flight plan off established airways is 80 miles. This standard is set to ensure that pilots have a reliable means of navigation, as VORs (VHF Omnidirectional Range) provide critical navigation signals that pilots use for course guidance and position fixing.

When operating off of established airways, which are defined routes in the sky that enhance safety and navigational accuracy, the spacing of VORs is crucial. The 80-mile distance ensures that a pilot can receive reliable VOR signals without the risk of signal loss, allowing for safe navigation regardless of the specific route taken.

This spacing requirement comes into play especially to accommodate the range of the VOR signals and ensure that there is minimal disruption in navigation for IFR flight operations, contributing to overall flight safety in various weather and operational conditions.