75-05-11 BOEING: Amendment 39-2113. Applies to all Model 747 Series Airplanes, certificated in all categories. \n\n\tCompliance required as indicated, unless already accomplished. \n\tTo assure flight crew aural warning and visual indication when the leading edge flaps are not fully extended for takeoff, accomplish the following: \n\tWithin five (5) calendar months time after the effective date of this AD, install modifications, in accordance with Boeing Service Bulletin 747-27-2128 dated February 14, 1975, or later FAA approved revisions, or in a manner approved by the Chief, Engineering and Manufacturing Branch, FAA Northwest Region to cause:\n \t(a)\tA takeoff configuration warning horn to sound when the leading edge flaps have not been fully extended, and the #3 thrust lever is advanced to a takeoff setting, and the trailing edge flaps are extended to a takeoff setting, and \n\t(b)\tA leading edge flap amber caution light to illuminate on the pilots' panel, when any leading edge flapsets are not in the extended position, and the trailing edge flaps are extended to a takeoff setting. \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\tAll 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, Seattle, Washington 98108. \n\n\tThis amendment becomes effective March 24, 1975.