What altitude range does the APN-194 radar altimeter measure?

The APN-194 radar altimeter is designed to accurately measure terrain clearance and altitude from 0 to 4,500 feet above ground level. This capability is vital for various aviation operations, particularly in low-flying missions where precise altitude information is essential for safe navigation and obstacle avoidance.

The radar altimeter utilizes radio waves to measure the time it takes for a signal to bounce back from the ground, which enables it to determine altitude relative to the terrain below. This range allows pilots to receive reliable altitude readings during different phases of flight, especially when operating in environments where conventional altimeters may not provide sufficient accuracy.

Understanding the specific altitude range that the APN-194 radar altimeter measures is crucial for pilots in order to utilize it effectively and ensure operational safety. The other options indicate lower maximum altitude capabilities that do not align with the specifications of the APN-194, reinforcing the primacy of the 0 to 4,500 ft measurement range within its operational parameters.