FAA figures/8080-3F/Figure 223 and Legend 27

Figure 223 and Legend 27: ILS RWY 31, Des Moines (DSM), with the rate-of-descent table

FAA-CT-8080-3F · Instrument Rating supplement · asked on the Instrument Rating test

FAA Figure 223 and Legend 27ILS RWY 31, Des Moines (DSM), with the rate-of-descent tableFAA-CT-8080-3F · Instrument Rating supplement
How to read it: Take the glide-slope angle from the chart (3.00°) and the ground speed from the question, then read the descent rate in the Legend 27 table.

1 FAA question that refer to this figure

  1. Question 1 · Instrument Rating

    (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?

    • A.478 feet per minute.
    • B.318 feet per minute.
    • C.637 feet per nautical mile.
    Show answer and explanation

    Correct: A. 478 feet per minute.

    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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