78-04-03 MCDONNELL DOUGLAS: Amendment 39-3141. Applies to Model DC-9 Series airplanes, certificated in all categories, including Military Type C-9A, C-9B, and VC-9C, F/N's 1 through 862. \n\n\tCompliance required as indicated. \n\n\tTo prevent the aileron/spoiler mixer cam from disengaging from the cam roller, accomplish the following: \n\n\t(a)\tWithin the next 275 hours time in service after the effective date of this AD, unless already accomplished, inspect and re-shim if required as specified in Items 1 through 6 under Accomplishment Instructions in McDonnell Douglas DC-9 Alert Service Bulletin A27-189 dated October 7, 1977 or later FAA approved revision. \n\n\t(b)\tWithin the next 2000 hours time in service after the effective date of this AD, unless already accomplished, add washers as specified in Item 7 under Accomplishment Instructions in McDonnell Douglas DC-9 Alert Service Bulletin A27-189 dated October 7, 1977 or later FAA approved revision, or an equivalent modification approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\t(c)\tSpecial Flight permits may be issued in accordance with FAR's 21.197 and 21.199 to authorize operation of an airplane to a base for the accomplishment of the inspections and modifications required by this AD. \n\n\tThis amendment becomes effective February 21, 1978.