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What is required to accommodate for the ground effect in swiveling pitot tube below rotor system?

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What is required to accommodate for the ground effect in swiveling pitot tube below rotor system?

(a) Secondary radar

(b) Doppler

(c) GPS

(d) Radio altimeter

This question was addressed to me in final exam.

The above asked question is from Helicopter, Optical and Hyper Sonic Air Data in division Air Data Systems, Altitude and Heading Reference of Avionics

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The correct option is (d) Radio altimeter

Explanation: The principle of the probe is that the horizontal component of the induced flow velocity is a repeatable function of horizontal airspeed but varies with ground proximity. Hence, a radar altimeter is required to accommodate the ground effect.

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