What frequency tone can be heard through the audio system when the aircraft is over the middle marker?

What frequency tone can be heard through the audio system when the aircraft is over the middle marker?

• A. 1000 Hz
• B. 1300 Hz
• C. 1500 Hz
• D. 1200 Hz

Answer: (B)

When an aircraft passes over the middle marker during the approach phase of landing, a specific audio tone is generated to provide situational awareness to the pilots. The tone that is associated with the middle marker is 1300 Hz. This frequency is standardized for alerts related to the middle marker, which is part of the Instrument Landing System (ILS) used to guide aircraft during approach and landing. The 1300 Hz tone aids in confirming to the crew that they are at the correct point in the approach as they get closer to the runway, which is crucial for maintaining situational awareness. Other tones correspond to different markers; for example, the outer marker typically emits a 400 Hz tone, while the inner marker emits a 3000 Hz tone. Therefore, recognizing and understanding the specific frequency associated with each marker is essential for avionics operations and ensuring pilot awareness during critical phases of flight.

When an aircraft passes over the middle marker during the approach phase of landing, a specific audio tone is generated to provide situational awareness to the pilots. The tone that is associated with the middle marker is 1300 Hz. This frequency is standardized for alerts related to the middle marker, which is part of the Instrument Landing System (ILS) used to guide aircraft during approach and landing.

The 1300 Hz tone aids in confirming to the crew that they are at the correct point in the approach as they get closer to the runway, which is crucial for maintaining situational awareness. Other tones correspond to different markers; for example, the outer marker typically emits a 400 Hz tone, while the inner marker emits a 3000 Hz tone. Therefore, recognizing and understanding the specific frequency associated with each marker is essential for avionics operations and ensuring pilot awareness during critical phases of flight.