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 VORs (within 14 CFR 91.171 limits) can have errors that result in significant lateral displacement, potentially compromising obstacle clearance, especially far from the VOR station.
Cumulative errors from sequential VOR checks (e.g., dual VOR check against an already inaccurate VOR) can compound inaccuracies, leading to misidentification of critical approach points and dangerous vertical displacement.
Despite the prevalence of GPS, thorough VOR checks are crucial; pilots should consider repairing VORs for enhanced safety even if their accuracy falls within regulatory limits.
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.
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