Breadstickking3618 Breadstickking3618 09-12-2022 Engineering contestada what is the mda and visibility criteria for a straight-in loc/dme rwy 21 approach at portland international in a category b airplane? a. 700 ft. msl; visibility 1 nm. b. 1,120 ft. msl; visibility 1 sm. c. 700 ft. msl; visibility 1 sm.