ifr proceduresFAA-published sample question (IRH, Aug 2021)
(Refer to FAA-CT-8080-3F, Figure 223 and Legend 27.) You have been cleared for the ILS RWY 31 approach to DSM. At a ground speed of 90 knots, what is the rate of descent on final approach?
FAA Figure 223 and Legend 27ILS RWY 31, Des Moines (DSM), with the rate-of-descent tableFAA-CT-8080-3F · Instrument Rating supplement
A
478 feet per minute.✓ Correct Answer
B
318 feet per minute.
C
637 feet per nautical mile.
Explanation
The DSM ILS RWY 31 profile shows a 3.00-degree glide slope (TCH 52). In the Legend 27 table, a 3.0-degree path is 318 feet per nautical mile and, at 90 knots groundspeed, 478 feet per minute (318 x 1.5 NM per minute). 318 is the per-mile gradient, not a rate, and 637 is the rate at 120 knots.
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