90-15-12 BOEING: Amendment 39-6663. Docket No. 90-NM-130. \n\n\tApplicability: All model 727 series airplanes, modified by installation of Pratt and Whitney JT8D-217C or -219 engines in accordance with Valsan Supplemental Type Certificate (STC) SA4363NM, certificated in any category. \n\n\tCompliance: Required as indicated, unless previously accomplished. \n\n\tTo prevent the migration off the through-bolt of engine front mount upper and lower cone bolt through-bolt nut, accomplish the following: \n\n\tA.\tWithin 48 clock hours (not flight hours) after receipt of Telegraphic AD T90-11- 53, dated May 24, 1990, inspect the through-bolt nut, part number SPS83978-1216, for proper torque and for certain conditions in accordance with Valsan Operator Service Letter OSL-727RE- 007, Revision 1, dated May 23, 1990. If any discrepancies are found, prior to further flight, take corrective action in accordance with the previously mentioned service letter. \n\n\tB.\tRepeat the inspections in accordance with Valsan Operator Service Letter OSL- 727RE-007, Revision 1, dated May 23, 1990, at intervals not to exceed 35 flight hours. \n\n\tC.\tWithin 10 days after performing the inspection required by paragraph A., above, submit a report of any discrepancies discovered, to the Manager, Los Angeles Manufacturing Inspection District Office, 3229 East Spring Street, Long Beach, California 90806-2425. The report must include the airplane's serial number. \n\n\tD.\tWithin 60 days after the effective date of this amendment, install anti-rotation plates in accordance with Valsan Service Bulletin 71-002, dated June 1, 1990. This modification constitutes terminating action for the repetitive inspections required by paragraphs A. and B., above. \n\n\tE.\tAn alternate means 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 be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO. \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 information from the manufacturer may obtain copies upon request to Valsan Product Support, 3605 Long Beach Boulevard, Suite 205, Long Beach, California 90807. This information may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 17900 Pacific Highway South, Seattle, Washington, or at the Seattle Aircraft Certification Office, 9010 East Marginal Way South, Seattle, Washington. \n\n\tThis amendment (39-6663, AD 90-15-12) supersedes telegraphic AD T90-11-53, dated May 24, 1990. \n\tThis amendment becomes effective on July 31, 1990.