74-19-06: Torque Tube Cranks

74-19-06 BOEING: Amendment 39-1960. Applies to Boeing Model 747 airplanes, certificated in all categories, which are affected by Boeing Service Bulletin 747-52-2090. Compliance required as indicated: \n\t(A)\tWithin the next 1200 hours time in-service after the effective date of this AD, unless already accomplished in the last 800 hours time in-service, and at intervals thereafter not to exceed 2,000 hours time in-service, visually inspect the torque tube cranks, Part Numbers 65B05025-1 and -2, 69B02875-1 and -2, and 65B09704-1 on passenger doors Nos. 2, 4, and 5 right- and left-hand sides for cracks. If cracks are not found, apply LPS-3 and retorque cross bolts in accordance with Paragraph III, Part I of FAA-approved Boeing Service Bulletin 747-52- 2090, dated May 17, 1974, or FAA approved revisions. If cracks are found, repair or replace in accordance with Paragraph (B) below. \n\t(B)\tCracked parts may be repaired by installation of a saddle clamp in accordance with Paragraph III,Part II of FAA-approved Boeing Service Bulletin 747-52-2090, or FAA-approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, and shall be reinspected in accordance with FAA-approved Boeing Service Bulletin 747-52-2090 at intervals thereafter not to exceed 3,200 hours time in-service. As terminating action, cracked parts may be replaced with new parts in accordance with Paragraph III, Part III of FAA-approved Boeing Service Bulletin 747-52-2090, or FAA-approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. \n\t(C)\tUpon request of the operator, an FAA maintenance inspector, subject to prior approval of the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, may adjust the repetitive inspection intervals specified in this AD to permit compliance at an established inspection interval of the operator, if the request contains substantiating data to justifythe adjustment. \n\tThis amendment becomes effective thirty days after September 20, 1974.