66-22-02\tBOEING: Amdt. 39-285 Part 39 Federal Register September 7, 1966. Applies to Model 727 Series Airplanes Listed in Boeing Service Bulletin No. 29-22, Dated February 21, 1966.\n \n\tCompliance required within the next 700 hours' time in service after the effective date of this AD, unless already accomplished. \n\n\tTo prevent failure of the pneumatic brake system due to leaks between the control valve and the brake housing, modify the pneumatic brake system line installation in accordance with Boeing Service Bulletin No. 29-22, dated February 21, 1966, or later FAA-approved revision, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. \n\n\tThis directive effective October 7, 1966.