91-22-04: Main Cargo Door

91-22-04 BOEING: Amendment 39-8064. Docket No. 91-NM-105-AD. \n\n\tApplicability: Model 707/720 series airplanes with a main cargo door, listed in Boeing Service Bulletin 3477, dated July 26, 1990; and Models 727-100C and 727-200F series airplanes, listed in Boeing Service Bulletin 727-52-0142, dated July 26, 1990; certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished, or unless the main cargo door has been deactivated in accordance with Boeing Service Bulletin 3311, dated May 26, 1978 (for Model 707/720 series airplanes), or Boeing Service Bulletin 727-29-0053, dated July 8, 1977 (for Model 727 series airplanes). \n\n\tTo prevent inadvertent opening of the main cargo door, accomplish the following: \n\n\t(a)\tWithin the next 30 days after the effective date of this AD, change the operating procedures for the main cargo door to include the following requirements, and thereafter comply with those revised procedures until the inspection required by paragraph (b) of this AD has been accomplished: Prior to takeoff following each operation of the door, conduct a visual verification, through the external viewports, to ensure proper engagement of the latching cams to ensure that the door is fully latched closed. This information must be relayed to and acknowledged by the flight crew. \n\n\t\t(1)\tThe procedures required by this paragraph must be accomplished by a qualified and trained mechanic or flight officer, and the training program must be approved by the FAA Principal Maintenance Inspector (PMI). \n\n\t\t(2)\tDocumentation of compliance with these procedures is required and the method of documentation must be approved by the FAA PMI.\n \n\t(b)\tWithin the next 18 months after the effective date of this AD, perform a visual inspection for wear of the mating surfaces of the pressure relief door hinge fittings and latch cams of the main cargo door, in accordance with Section III, Part I, of the Boeing Service Bulletin 3477, dated July 26, 1990 (for Model 707/720 series airplanes), or Boeing Service Bulletin 727-52-0142, dated July 26, 1990 (for Model 727 series airplanes). \n\n\t\t(1)\tIf wear exceeds the limits specified in the applicable service bulletin: Prior to further flight, replace worn parts, as follows. Do not intermix original configuration parts with modified parts in the same door. \n\n\t\t\t(i)\tReplace worn parts with modified parts in accordance with Section III, Part II, of the applicable service bulletin; or \n\n\t\t\t(ii)\tReplace worn parts with airworthy parts of the original configuration in accordance with FAA-approved procedures. \n\n\t\t(2)\tThe inspection and replacement of parts, if necessary, in accordance with this paragraph constitutes terminating action for the special operating procedures required by paragraph (a) of this AD. \n\n\t(c)\tWithin 36 months after the effective date of this AD, accomplish the following in accordance with Section III, Part II, of Boeing Service Bulletin 3477, dated July 26, 1990 (for Model 707/720 series airplanes), or Boeing Service Bulletin 727-52-0142, dated July 26, 1990 (for Model 727 series airplanes). \n\n\t\t(1)\tReplace the latch cams, \n\n\t\t(2)\tReplace the latch cam bellcranks, \n\n\t\t(3)\tReplace the pressure relief door hinge fittings, and \n\n\t\t(4)\tPerform the operation, control, and door warning system tests. \n\n\t(d)\tFor airplanes on which the main cargo door has been deactivated: \n\n\t\t(1)\tPrior to reactivating the main cargo door, accomplish the inspection required by paragraph (b) of this AD. \n\n\t\t(2)\tWithin the next 18 months after reactivation, or within 36 months after the effective date of this AD, whichever is later, accomplish the requirements of paragraph (c) of this AD. \n\n\t(e)\tThe accomplishment of Section III, Part II, of Boeing Service Bulletin 3477, dated July 26, 1990 (for Model 707/720 series airplanes), or Boeing Service Bulletin 727-52-0142, dated July 26, 1990 (for Model 727 series airplanes), as applicable, constitutes terminating action for the requirements of this AD. \n\n\t(f)\tAn alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. \n\n\tNOTE: The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO. \n\n\t(g)\tSpecial flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD. \n\n\t(h)\tThe inspection and repair requirements shall be done in accordance with Boeing Service Bulletin 3477, dated July 26, 1990, or Boeing Service Bulletin 727-52-0142, dated July 26, 1990, as applicable. This incorporation by reference was approved by the Director of the Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR Part 51. Copies may be obtained from Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124. Copies may be inspected at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, D.C. \n\n\tThis amendment (39-8064, AD 91-22-04) becomes effective on November 29, 1991.