AD 90-15-12 Airworthiness Directives; Boeing Model 727 Series Airplanes Modified in Accordance with Valsan Supplemental Type Certificate (STC) SA4363NM

Models named: 727 series. Read the applicability below — it usually turns on serial or part numbers too.

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. Note 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been otherwise modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must request approval for an alternative method of compliance in accordance with paragraph (e) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Required as indicated, unless accomplished previously. To prevent the nut coming off the through-bolt allowing the through-bolt to migrate out of the engine mount flange and cone bolt and possible separation of the engine, accomplish the following: Inspection/Corrective Action (a) Within 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 as specified in Valsan Operator Service Letter OSL-727RE-007, Revision 1, dated May 23, 1990, in accordance with the service letter. If any discrepancies are found, prior to further flight, take corrective action in accordance with the service letter. (b) Repeat the inspections required by paragraph (a) of this AD thereafter at intervals not to exceed 35 flight hours. Reporting Requirement (c) Within 10 days after performing the inspection required by paragraph (a) of this AD, submit a report of any discrepancies discovered to the Manager, Los Angeles Manufacturing Inspection District Office, 3960 Paramount Boulevard, Lakewood, California 90712-4137. The report must include the airplane's serial number. Installation (d) Within 60 days after July 31, 1990 (the effective date of AD 90-15-12, amendment 39-6663), 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 paragraph (a) and (b) of this AD. Alternative Methods of Compliance (e) An alternative method of compliance or adjustment of the compliance time that provides an acceptable level of safety may be used if approved by the Manager, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. Operators shall submit their requests through an appropriate FAA Principal Maintenance Inspector, who may add comments and then send it to the Manager, Los Angeles ACO. Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Los Angeles ACO. Special Flight Permits (f) Special flight permits may be issued in accordance with sections 21.197 and 21.199 of the Federal Aviation Regulations (14 CFR 21.197 and 21.199) to operate the airplane to a location where the requirements of this AD can be accomplished. (g) This amendment becomes effective on August 15, 2000. Issued in Renton, Washington, on July 25, 2000. Donald L. Riggin, Acting Manager, Transport Airplane Directorate, Aircraft Certification Service. [FR Doc. 00-19261 Filed 7-28-00; 8:45 am] BILLING CODE 4910-13-U