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The quiz.

IFR is often about flying the angles. Here are a few questions about angles coming down to the runway.

Answers are on page 23.

1. For a runway with both an ILS approach and a visual approach slope indicator (VASI), the glideslope and the visual slope:

a. Always coincide.

b. Sometimes coincide.

c. Coincide unless otherwise noted on the approach plate.

d. Never exactly coincide.

2. False glideslopes shouldn't be an issue below _ degrees up from the glideslope antenna.

a. 25

b. 18

c. 12

d. 9

3. The width of the localizes signal in degrees is:

a. 10

b. 6

c. 3

d. It depends

4. The width of a simplified directional facility (SDF) in degrees is:

a. 12

b. 6

c. 3

d. It depends.

5. When a vertical descent angle is published in the profile view of a non-precision instrument approach plate, that angle:

a. Matches any visual glidepath (VASI, PAPI) for that runway.

b. Is from the minimum crossing height (MCH) at FAF to the threshold.

c. Is from the MCH at FAF to a point about 1000 feet beyond the threshold.

d. Can only be used by appropriately equipped aircraft.


6. A Localizer signal radiates 35 degrees left and right of the runway (within 10 miles) but has no limits on reception from directly above. The SDF, on the other hand, is usually only receivable in the direction of the runway centerline on an angle of_degrees above the horizontal.

a. 7 b. 10 c. 18 d. 25


1. c. The two angles are usually the same, but not always. When they differ, the approach plate should show "VGSf and ILS glidepath not coincident" in the profile view of NACO plates or the notes for Jepp. (Instrument Flying Handbook, Chapter 7)


2. d. Actually, the stat is nine to 12 degrees. But that means under nine should always be safe. (Instrument Flying Handbook, Chapter 7)

3. d. It's usually around five degrees but can be as narrow as three for a long runway. It's adjusted to be 700 feet wide at the landing threshold. The longer the runway, the more sensitive the localizer will seem from the cockpit.

4. d. While the SDF width is fixed, it could be either six or 12 degrees. (Instrument Flying Handbook, Chapter 7)

5. c. The angle is a line from the FAF at the minimum crossing altitude to the runway touchdown zone, usually about 1000 feet down the runway. The "TCH" published below the visual descent angle is the height at which you'd cross the threshold on your way to the touchdown zone. (Instrument Flying Handbook, Chapter 7)

6. a. How about that? You can learn all sorts of interesting things by hitting the books. {Instrument Flying Handbook, Chapter 7)

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Geographic Code:1USA
Date:Jun 1, 2011
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