airport operationsFAA-published sample question (FIA, Aug 2021)
The 'ILS critical area boundary sign' identifies
A
the exit boundary for the runway protected area.
B
the edge of the ILS critical area.✓ Correct Answer
C
the area where an aircraft is prohibited from entering.
Explanation
AIM 2-3-9 says the ILS critical area boundary sign is located at the edge of the ILS critical area and marks its boundary, so a pilot exiting the area knows when it is clear. The runway boundary sign marks the runway protected area, and the No Entry sign marks prohibited areas.
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