Which marker’s pitch is associated with the middle marker?

• A. Low pitched
• B. Medium pitched
• C. High pitched
• D. Ultrahigh pitched

Answer: (B)

The concept being tested is how marker beacons on an ILS provide distinctive audible cues to identify which marker you’re crossing. Each marker emits a different tone: the outer marker uses a low-pitched tone, the inner marker uses a high-pitched tone, and the middle marker uses a tone that's in the middle of the range. The middle marker’s tone is 1300 Hz, which is in the mid-range of audible frequencies, so it’s described as medium pitched. Since the middle marker is the amber beacon indicating you’re approaching the runway area but not yet at the inner marker, its mid-range tone is the defining cue pilots listen for. Therefore, medium pitched is the best answer.