61-26-04: Fuel Pressurizing and Dump Valve Seals

61-26-04 PRATT & WHITNEY: Amdt. 380 Part 507 Federal Register December 21, 1961. Applies to All JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 Turbofan Engines. Compliance required as indicated. Due to recent inflight engine fires resulting from fuel leakage occurring at the fuel transfer points where the fuel pressurizing and dump valve attaches to the engine, the following is required: (a) All Pratt & Whitney aircraft JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 turbofan engines installed in Boeing aircraft. Compliance required within the next 100 hours' time in service unless already accomplished within the last 200 hours' time in service and every 300 hours' time in service thereafter until metal chevron type seals are incorporated. Replace the P/N's 443098, 379644, 371339, or 367444 fuel pressurizing and dump valve seals with new seals of the same part numbers where the pressurizing and dump valve assembly attaches to the fuel manifold inlet distributor assembly. (Pratt & Whitney Aircraft telegraphic message dated September 28, 1961, covers the same subject.) (b) All Pratt & Whitney aircraft JT3D-1, JT3D-1-MC6, JT3D-1-MC7, and JT3D-3 turbofan engines installed in Boeing and Douglas aircraft. Compliance required not later than the first engine overhaul after June 1, 1962. Rework the engine in accordance with Pratt & Whitney Aircraft Turbojet Engine Service Bulletin No. 274 which provides for metal chevron type seals. (c) Upon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Eastern Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection period of the operator if the request contains substantiating data to justify the increase for such operator. This directive effective December 21, 1961. Revised March 16, 1962.