AD 75-20-09

75-20-09 BOEING: Amendment 39-2375 as amended by Amendment 39-2445. Applies to Boeing Model 727 series airplanes, certificated in all categories, listed in Boeing Service Bulletin No. 727-57-137, Revision 2, or later FAA approved revisions. Compliance required as indicated. To prevent wing vibration from loose blind rivets in the outboard aileron tab mast fittings, accomplish the following: A. Within the next 200 flight hours from April 21, 1975, unless AD 75-08-10 has previously been accomplished, inspect all outboard aileron tab mast fittings for looseness, and repair, as necessary, in accordance with Boeing Alert Service Bulletin No. 727-57-137, Revision 2, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. Within 15 days from the time of the inspection of each airplane, report all findings, positive or negative, to the Chief, Engineering and Manufacturing Branch, FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108, or call the FAA project engineer at (206) 767-2516. The report must include the following:

a. Airplane model number. b. Airplane total time. c. Description of looseness condition, if applicable, including number and type of fasteners loose and number of fittings per tab with loose fasteners.

(Reporting approved by the Bureau of the Budget under BOB No. 04R0174).

B. Within the next 2500 flight hours or 325 days from November 5, 1975, whichever occurs first, inspect the attaching blind rivets of the outboard aileron tab mast fittings for looseness. Repair, as necessary, in accordance with Boeing Alert Service Bulletin 727-57-137, Revision 1, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. C. As terminating action to this AD, prior to July 1, 1977, unless already accomplished, replace all blind rivets with bolts and nutplates inaccordance with Boeing Alert Service Bulletin 727-57-137, Revision 1, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region. The 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). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplane Company, P. O. Box 3707, Seattle, Washington 98124. The documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington.

Amendment 39-2375 became effective November 5, 1975. This amendment 39-2445 supersedes AD 75-08-10. This amendment 39-2445 becomes effective December 12, 1975.