87-10-02 BOEING: Amendment 39-5620. Applies to Model 767 series airplanes, as listed in Boeing Alert Service Bulletin 767-27A0074, dated March 20, 1987, certificated in any category. Compliance required as indicated, unless previously accomplished. \n\n\tTo prevent lateral control system restriction or jamming resulting from improper installation of a trailing edge flap drive vapor seal, accomplish the following: \n\n\tA.\tWithin the next 100 landings or 30 days after the effective date of this AD, whichever occurs first, inspect the trailing edge flap drive vapor seals for correct installation in accordance with Boeing Alert Service Bulletin 767-27A0074, dated March 20, 1987, or later FAA-approved revision. Vapor seals found to be installed incorrectly must be reworked to correct the installation before further flight in accordance with the instructions contained in the aforementioned alert service bulletin. \n\n\tNOTE: At the time of issuance of this AD, the Boeing 767 IllustratedParts Catalog, the Boeing 767 Maintenance Manual, and the Boeing 767 Maintenance Planning Data document all contained illustrations depicting a trailing edge flap drive vapor seal installed incorrectly, with the vapor seal flanges aligned vertically. The FAA-approved airplane maintenance program should be revised to take account of these errors. \n\n\tB.\tAn alternate means of compliance which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office, FAA, Northwest Mountain Region. \n\n\tC.\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\tAll persons affected by this directive who have not already received the appropriate service information from the manufacturer may obtain copies upon request to the Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124. This information may be examinedat FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington, or Seattle Aircraft Certification Office, FAA, Northwest Mountain Region, 9010 East Marginal Way South, Seattle, Washington. \n\n\tThis amendment 39-5620 becomes effective May 22, 1987.