220 - ATPL Question Bank in English - For this exercise, use the radio-horizon model R = 1.23(√h_aircraft + √h_ground), with heights in feet above MSL and R in NM. The VDF antenna is at 169 ft MSL. Assume ISA so the stated flight levels correspond to the required geometric heights. Which of the offered flight levels is the lowest that gives a calculated range of at least 113 NM?

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