91-20-04: Stabilizer Trim Assembly

1-20-04 BOEING: Amendment 39-8038. Docket No. 91-NM-38-AD. \n\n\tApplicability: Boeing Model 737-300, -400, and -500 series airplanes, as listed in Boeing Service Bulletin 737-27-1161, dated November 1, 1990, certificated in any category. \n\n\tCompliance: Required within 36 months after the effective date of this AD, unless previously accomplished. \n\n\tTo prevent uncommanded stabilizer movement in the static position, accomplish the following: \n\n\t(a)\tRemove the existing stabilizer trim jackscrew actuator and replace it with a stabilizer trim assembly that has been modified with the redesigned auxiliary brake assembly in accordance with Boeing Service Bulletin 737-27-1161, dated November 1, 1990. \n\n\t(b)\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 beforwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO. \n\n\t(c)\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(d)\tThe replacement requirements shall be done in accordance with Boeing Service Bulletin 737-27-1161, dated November 1, 1990. 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 (39-8038, AD 91-20-04) becomes effective on November 7, 1991.