Figure 91: En route low-altitude chart segment (DBS to BZN, V343)
FAA-CT-8080-3F · Instrument Rating supplement · asked on the Instrument Rating test
2 FAA questions that refer to this figure
Question 1 · Instrument Rating
(Refer to FAA-CT-8080-3F, Figure 91.) When flying a northbound IFR flight on V257, what is the minimum crossing altitude at DBS VORTAC?
- A.7,500 feet.
- B.8,600 feet.
- C.11,100 feet.
Show answer and explanation
Correct: B. 8,600 feet.
The flag at Dubois (DBS) VORTAC in Figure 91 indicates a minimum crossing altitude, and the MCA box beneath the DBS frequency box lists "V21-257 8600 N". So northbound aircraft on V257 must cross DBS at or above 8,600 feet. 7,500 is not listed, and 11,100 is the MCA at SABAT on V298.
Open this question’s pageQuestion 2 · Instrument Rating
(Refer to FAA-CT-8080-3F, Figure 91.) What does "15000" on V343 between DBS and BZN guarantee?
- A.The lowest altitude that ensures navigational signal coverage and obstacle clearance.
- B.The highest altitude that ensures 120 nautical mile navigational signal coverage between VORs.
- C.The lowest altitude that ATC may use to vector an aircraft from the en route structure to the approach segment.
Show answer and explanation
Correct: A. The lowest altitude that ensures navigational signal coverage and obstacle clearance.
An altitude printed on an airway without an asterisk is the minimum en route altitude (MEA), defined as the lowest published altitude between radio fixes that assures acceptable navigational signal coverage and meets obstacle clearance requirements. It is not a maximum altitude, and minimum vectoring altitudes are not charted on airways.
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