80-02-01 R2 BOEING: Amendment 39-3659 as amended by Amendment 39-3864 is further amended by Amendment 39-3969. Applies to Model 727 series airplanes certificated in all categories which have an operative Boeing designed auxiliary body fuel system installed. Compliance required within 600 flight hours from the effective date of this AD unless this initial inspection and test has been accomplished within the past 300 flight hours. To prevent failure of the fuel system and unwanted fuel transfer to the auxiliary body fuel tanks, accomplish the following: \n\n\tA.\tInspect and test the auxiliary body fuel tank installation as required and as outlined in Boeing Service Bulletin 727-28-A62 Revision 2 or later FAA approved revisions. If the shrouds are found defective, replace with a serviceable Boeing part or deactivate the system prior to further flight. \n\n\tB.\tRepeat the required inspections and tests every 1500 flight hours after the initial inspection unless the system has been deactivated. If shrouds are found defective, replace with a serviceable Boeing part, or deactivate the system prior to further flight.\n\n \tThe recurring inspection interval may be adjusted upon request of the operator. The FAA Maintenance Inspector, subject to prior approval by the Chief, Engineering and Manufacturing Branch, Northwest Region, may adjust the repetitive inspection interval specified in this AD if the request contains substantiating data to justify the increase. \n\n\tC.\tPrior to reactivating a previously deactivated auxiliary body fuel system, whether deactivated voluntarily or due to defects found in the auxiliary tank fuel system through inspections and tests accomplished in paragraphs A. and B. above, the auxiliary body fuel system must be repaired as required and shown to meet the requirements of paragraph A. and must be reinspected on a recurring basis per paragraph B. \n\n\tD.\tInstallation of the following Boeing final design part numbered refuel and vent line shrouds for the corresponding original and or interim design Boeing part number refuel and vent line shrouds will relieve the operator from compliance with the inspection and test requirements outlined in Paragraphs A, B and C above. This constitutes terminating action for the AD. \n\n\n\nOriginal Design\tPart Numbers\nInterim Design Part Numbers\nFinal Design Part Numbers \nBE-650-12-78-6*\n10-61707-43 \n10-61707-431 \n -528-6 \n -44\n -441 \n -223-6\n -45\n -451 \n -450-6\n -46\n -461 \n -334-6\n -47\n -471 \n -240-6\n -48\n -481 \n10-61707-8\t\t\t\n10-61707-49 \n10-61707-491 \n -9\n-50\n-501 \n-10\n-51\n-511\n-11\n-52\n-521\n-12\n-53\n-531\n-13\n-54\n-541\n-14\n-55\n-551\n-15\n-56\n-561\n-16\n-57\n-571\n-17\n-58\n-581\n-18\n-59\n-591\n-19\n-49\n-491\n-20\n-50\n-501\n-21\n-51\n-511\n-22\n-52\n-521\n-23\n-53\n-531\n-24\n-54\n-541\n-25*\n-55\n-551\n-26\n-56\n-561\n-27\n-57\n-571\n-28\n-58\n-581\n-29\n-59\n-591\n-30\n-60\n-601\n-31\n-61\n-611\n-32\n-62\n-621\n-33\n-63\n-631\n-34\n-64\n-641\n-41-71\n-711\nBE-650-12-78-6*\n-74\n-741\n10-61707-25*\t\n-75\n-751 \n\n\t*Originally, 10-61707-25 and BE-650-12-78-6 served as both a vent shroud and a fuel shroud (used separately). In the final design, they are identified separately, and the drawings so indicate. \n\n\tThe manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). \n\n\tAll persons affected by this directive who have not already received these documents and special tools from the manufacturer, may obtain same upon request to Boeing Commercial Airplane Company, Post Office Box 3707, Seattle, Washington 98124. The service bulletin may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108. \n\n\tAmendment 39-3659 became effective January 22, 1980.\n\n \tAmendment 39-3864 became effective August 12, 1980. \n\tThis Amendment 39-3969 becomes effective November 20, 1980.