89-03-05 BOEING: Amendment 39-6120. Applicability: Model 757 series airplanes listed in Boeing Alert Service Bulletin 757- 27A0086, dated June 9, 1988, certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\n\tTo prevent unacceptable airframe vibrations during flight, accomplish the following: \n\n\tA.\tFor airplanes on which the elevator power control actuator (PCA) rod end and reaction link rod end bearings are lubricated at intervals of 1,000 flight hours or less, in accordance with Boeing Service Letter 757-SL-27-26, dated April 1, 1988: Within the next 90 days after the effective date of this AD or prior to the accumulation of 4,000 flight hours total time-in-service, whichever occurs later, and thereafter at intervals not to exceed 4,000 flight hours, perform an elevator freeplay check in accordance with Boeing Alert Service Bulletin 757- 27A0086, dated June 9, 1988. \n\n\tB.\tFor all other airplanes: Within the next 90 daysafter the effective date of this AD or prior to the accumulation of 3,000 flight hours total time-in-service, whichever occurs later, and thereafter at intervals not to exceed 3,000 flight hours, perform an elevator freeplay check in accordance with Boeing Alert Service Bulletin 757-27A-0086, dated June 9, 1988. \n\n\tC.\tIf freeplay exceeds the limits specified in the service bulletin, before further flight, replace elevator PCA reaction link rod end bearings and PCA rod end bearings, as necessary, in accordance with Boeing Alert Service Bulletin 757-27A0086, dated June 9, 1988. \n\n\tD.\tTerminating action for the repetitive inspection requirements of paragraph A. and B. of this AD consists of replacing all old design PCA reaction link rod end bearings with improved bearings and subsequent successful completion of freeplay inspection, in accordance with Boeing Alert Service Bulletin 757-27A0086, dated June 9, 1988. \n\n\tE.\tAn alternate means of compliance or adjustment of the compliancetime, 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\tNOTE: The request should be forwarded through an FAA Principal Maintenance Inspector (PMI), who may add any comments and then send it to the Manager, Seattle Aircraft Certification Office. \n\n\tF.\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 documents from the manufacturer may obtain copies upon request to Boeing Commercial Airplanes, P.O. Box 3707, Seattle, Washington 98124. These documents may be examined at the 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 (39-6120, AD 89-03-05) becomes effective March 6, 1989.