ifr navigationFAA-published sample question (IRA, Aug 2021)
When flying directly over a published airborne VOR checkpoint, what is the maximum error allowed for IFR flight?
A
Plus or minus 6° of the designated radial.✓ Correct Answer
B
Plus or minus 4° of the designated radial.
C
Plus 6° or minus 4° of the designated radial.
Explanation
For the IFR VOR equipment check, 14 CFR 91.171(b)(3) allows a maximum bearing error of plus or minus 6 degrees when using a designated airborne checkpoint. Plus or minus 4 degrees applies to a VOT or a designated surface checkpoint (91.171(b)(1)-(2)). The tolerance is symmetric, not +6/-4.
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