66-18-01 AIR CRUISERS: Amdt. 39-267 Part 39 Federal Register July 29, 1966. Applies to Emergency Evacuation Slides, P/N's 15D22129 and 15D22129-1, Manufactured Before April 17, 1966, and Installed on Boeing Model 727 Series Airplanes. \n\n\tCompliance required within the next 300 hours' time in service after the effective date of this AD, unless already accomplished. \n\n\tTo prevent hang-up during operation, modify Air Cruisers emergency evacuation slides, P/N's 15D22129 and 15D22129-1, manufactured before April 17, 1966, and installed on Boeing Model 727 Series airplanes, in accordance with Procedures 1 and 2 of Air Cruisers Service Bulletin SB-114-66-2, dated April 18, 1966, or later FAA-approved revision, or an equivalent approved by an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region. \n\n\tThis directive effective July 29, 1966.