80-03-10 MCDONNELL DOUGLAS: Amendment 39-3673. Applies to Model DC-10, -10F, -30, -30F, -40 series airplanes certificated in all categories. \n\n\tCompliance is required as indicated. \n\n\tTo reduce the probability of complete failure of the stall warning function, accomplish the following: \n\n\t(a)\tOn or before 210 days after the effective date of this AD, unless already accomplished: \n\n\t\t1.\tInstall two (2) auto throttle/speed control computers, each of which receives information from the positions of both outboard wing slat groups, in addition to other previously required inputs, in accordance with design data approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t\t2.\tInstall a stick shaker at the First Officer's position, in addition to that previously required at the Captain's position, with both stick shakers actuated by either auto throttle/speed control computer in accordance with design data approved by the Chief, Aircraft Engineering Division, FAAWestern Region. \n\n\t(b)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of modifications required by this AD. \n\n\t(c)\tAlternative inspections, modifications or other actions which provide an equivalent level of safety may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis amendment becomes effective February 21, 1980.