ifr navigationFAA-published sample question (IRA, Aug 2021)
You are planning an IFR flight off established airways below 18,000 feet MSL. If you use VOR navigation to define the route, the maximum distance between NAVAIDS should be
A
40 NM.
B
70 NM.
C
80 NM.✓ Correct Answer
Explanation
AIM 5-1-6, under Direct Flights, says that for operations off established airways below 18,000 feet MSL you should use aids not more than 80 NM apart, which are depicted on en route low altitude charts. Wider spacing (200 or 260 NM) applies only to high-altitude operations using (H) class facilities. Neither 40 nor 70 NM is the published figure.
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