90-09-08 IPECO: Amendment 39-6486. Docket No. 89-ANE-28. \n\n\tApplicability: IPECO TSO-C39a crew seats, as follows: \n\n\nSeat Part Number\nSerial no. effectivity\nInstalled in but not limited to\n3A090-0021-01-2\nup to and including \nBoeing 737\n3A090-0022-01-2\n11009\n\n3A090-0021-02-2\n\n\n3A090-0022-02-2\n\n\n\n\n\n3A090-0019-01-1\nup to and including\nBoeing 737\n3A090-0020-01-1\n11115 \n\n\n\n\n3A090-0015-01-1\nup to and including\nBoeing 757, 767\n3A090-0016-01-1\n11143\n\n\n\n\n3A090-0025-01-1\nup to and including\nBoeing 757, 767\n3A090-0026-01-1\n11054\n\n\n\n\n3A090-0053-01-1\nup to and including\nBoeing 747-400\n3A090-0054-01-1\n11105\n\n\n\n\n3A090-0027-01-1\nup to and including\nBoeing 747\n3A090-0028-01-1\n11072\n\n\n\n\n3A102-0003-01-1\nup to and including\nBoeing 747-400\n\n11041\n\n\n\n\n3A090-0055-01-1\nup to and including\nBoeing 747-400\n3A090-0056-01-1\n11062\n\n\n\n\n3A103-0003-01-1\nup to and including\nBoeing 747-400\n\n10607 \n\n\n\n\n3A090-0017-01-1\nup to and including\nBoeing 747\n3A090-0018-01-1\n10100\n\n\n\n\n3A090-0065-01-1\nup to and including\nBoeing 747-400\n3A090-0066-01-1\n11635\n\n\n\n\n3A118-0003-01-1\nup to and including\nDeHavilland\n3A118-0004-01-1\n11580\nDHC-7 and DHC-8\n\n\tCompliance: Required as indicated, unless already accomplished. To prevent failure of the seat back structure, accomplish the following: \n\n\t(a)\tWithin the next 30 days after the effective date of this AD, unless already accomplished within the last 100 days and, thereafter, at intervals not to exceed 130 days from the last inspection, visually inspect the seat assembly as follows: \n\n\t\t(1)\tRemove seat pan cushion and back cushion from the seat assembly. Adjust the lumbar mechanism to the fully up, fully back position. Recline seat back to full recline. \n\n\t\t(2)\tBy looking through the lightening holes in the pan and back structure with a flashlight, examine the base of the back structure in the area where it attaches to the reclining mechanism. This area can be identified by the bracket at the base of the back structure. Return the seat back to its upright position and also examine the base of the back structure from the rear of the seat. \n\n\t\t(3)\tIf any crack or deformation of the seat back structure is found, replace the seat assembly with a serviceable unit before further flight. \n\n\t\t(4)\tWhen the repairs and modifications required by paragraph (b) have been accomplished, the repetitive visual inspections may be terminated. \n\n\t(b)\tWithin the next 15 months after the effective date of this AD, perform the repairs and modifications of the IPECO seat assemblies in accordance with the following service bulletins (SB): \n\n\nIPECO SB No.\nApplicable IPECO\nseat part numbers \nA001-25-29\n3A090-0021-01-2 \n\n3A090-0022-01-2 \n\n3A090-0021-02-2 \n\n3A090-0022-02-2 \n\n\nA001-25-30\n3A090-0019-01-1 \n\n3A090-0020-01-1 \n\n\nA001-25-31\n3A090-0015-01-1 \n\n3A090-0016-01-1 \n\n\nA001-25-32\n3A090-0025-01-1 \n\n3A090-0026-01-1 \n\n\nA001-25-33\n3A090-0053-01-1 \n\n3A090-0054-01-1\n\n\nA001-25-34\n3A090-0027-01-1 \n\n3A090-0028-01-1 \n\n\nA001-25-35\n3A102-0003-01-1 \n\n\nA001-25-36\n3A090-0055-01-1 \n\n3A090-0056-01-1 \n\n\nA001-25-37\n3A103-0003-01-1 \n\n\nA001-25-38\n3A090-0017-01-1 \n\n3A090-0018-01-1 \n\n\nA001-25-39\n3A090-0065-01-1 \n\n3A090-0066-01-1 \n\n\nA001-25-40\n3A118-0003-01-1 \n\n3A118-0004-01-1 \n\n\t(c)\tAircraft may be ferried in accordance with the provisions of FAR 21.197 and 21.199 to a base where the AD can be accomplished. \n\n\t(d)\tUpon submission of substantiating data by an owner or operator through an FAA Airworthiness Inspector, an alternate method of compliance with the requirements of this AD or adjustments to the compliance schedule specified in this AD may be approved by the Manager, Boston Aircraft Certification Office, Engine and Propeller Directorate, Aircraft Certification Service, Federal Aviation Administration, 12 New England Executive Park, Burlington, Massachusetts 01803. \n\n\tThe repair and modification procedures shall be done in accordance with IPECO SB No. A001-25-29, Issue No. 2, pages 1 and 2 dated April 28, 1989, and pages 3 through 18 inclusive, dated August 25, 1988; IPECO SB No. A001-25-30, Issue No. 2, pages 1 and 2 dated April 28, 1989, and pages 3 through 18 inclusive, dated September 9, 1988; and IPECO SB Nos. A001-25-31 through A001-25-40 inclusive, all Issue No. 2, pages 1 and 2 dated April 28, 1989, and pages 3 through 18 inclusive, dated September 13, 1988. 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 IPECO Inc., 15201 South Prarie Avenue, Lawndale, California 90260. Copies may be inspected at the Regional Rules Docket, Office of the Assistant Chief Counsel, Federal Aviation Administration, New England Region, 12 New England Executive Park, Room 311, Burlington, Massachusetts 01803, or at the Office ofthe Federal Register, 1100 L Street, NW, Room 8301, Washington, DC 20591. \n\n\tThis amendment (39-6486, AD 90-09-08) becomes effective on May 29, 1990.