We learned 14 CFR 91.171-the VOR Check rule-during instrument ground school. In this era of satellites and GNSS, this rule is often overlooked as VORs become just named fixes instead of navigation beacons. Even with the latest navigation equipment, however, 91.171 can rear its head from time to time.
Even legally compliant VOR receiver errors, as permitted by 14 CFR 91.171, can lead to significant off-course deviations, especially on long VOR approaches where angular error translates to large lateral displacement.
These seemingly minor, legal errors can cause aircraft to exceed protected airspace, putting them dangerously close to obstacles, even if the navigation display appears largely centered.
Cascading inaccuracies, such as those from dual VOR checks against an already inaccurate primary VOR, can compound errors, leading to misidentification of approach fixes and premature descents into hazardous terrain.
The article emphasizes that merely satisfying the minimum legal requirements for VOR checks may not guarantee safety, urging pilots to prioritize accurate equipment and consider repairs even if receivers technically meet regulations.
We learned 14 CFR 91.171—the “VOR Check” rule—during instrument ground school. In this era of satellites and GNSS, this rule is often overlooked as VORs become just named fixes instead of navigation beacons. Even with the latest navigation equipment, however, 91.171 can rear its head from time to time.
CREATE A FREE ACCOUNT
Sign up to keep reading
Create a free account to continue. Already a member? Sign in below.
