With the altitude switch in AUTO, when does the altitude switch from BARO to RALT?

With the altitude switch in AUTO, when does the altitude switch from BARO to RALT?

• A. Descending through 1500' AGL
• B. Descending through 1200' AGL
• C. Ascending through 1200' AGL
• D. At 1500' AGL

Answer: (B)

The correct choice indicates that when the altitude switch is in the AUTO position, it will transition from BARO (barometric) altitude to RALT (radio altitude) when descending through 1200 feet above ground level (AGL). This switch is critical for managing altitude information, particularly as an aircraft approaches the ground during a landing approach. BARO altitude uses atmospheric pressure to measure altitude, which can be less accurate at lower altitudes due to variations in local air pressure. When an aircraft descends to a low altitude, particularly below 1200 feet AGL, the RALT system provides a more precise measurement of altitude relative to the terrain, based on radio wave reflections from the ground. The transition to RALT at this specific altitude ensures that pilots have reliable altitude information as they make crucial landing decisions. BARO altitude readings may not be adequately accurate for these low-level operations, hence the switch is programmed to enhance safety and situational awareness.

The correct choice indicates that when the altitude switch is in the AUTO position, it will transition from BARO (barometric) altitude to RALT (radio altitude) when descending through 1200 feet above ground level (AGL).

This switch is critical for managing altitude information, particularly as an aircraft approaches the ground during a landing approach. BARO altitude uses atmospheric pressure to measure altitude, which can be less accurate at lower altitudes due to variations in local air pressure. When an aircraft descends to a low altitude, particularly below 1200 feet AGL, the RALT system provides a more precise measurement of altitude relative to the terrain, based on radio wave reflections from the ground.

The transition to RALT at this specific altitude ensures that pilots have reliable altitude information as they make crucial landing decisions. BARO altitude readings may not be adequately accurate for these low-level operations, hence the switch is programmed to enhance safety and situational awareness.