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(Refer to FAA-CT-8080-3F, Figure 254.) Which of the signs in the figure is a mandatory instruction sign?

FAA Figure 254Airport signs (holding position, ILS critical area, taxiway)FAA-CT-8080-3F · Instrument Rating supplement
How to read it: A = runway holding position marking (red/white sign is mandatory), B = ILS critical area holding position, C = taxiway/runway boundary (seen when exiting the runway).
A

Top red.✓ Correct Answer

B

Middle yellow.

C

Bottom yellow.

Explanation

AIM 2-3-8 describes mandatory instruction signs as white inscriptions on a red background; the top sign in Figure 254 (red, with a white circle and bar) is the no-entry sign, which is a mandatory instruction sign. The two yellow panels with black lines are boundary-type signs (the ones that mark the edge of a protected area you are leaving), not mandatory instruction signs.

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