When must an air carrier airplane be DME/suitable RNAV system equipped?
A
For flights at or above FL 180.✓ Correct Answer
B
Whenever VOR navigation equipment is required.
C
In Class E airspace for all IFR or VFR on Top operations.
Explanation
14 CFR 121.349 (like 91.205(e)) requires approved DME or a suitable RNAV system when VOR navigation equipment is required and the airplane is operated at or above FL 180 (24,000 feet in 91.205(e) for Part 91). It is not a general requirement whenever VOR is required or for all Class E IFR.
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