61-25-03 DOUGLAS: Amdt. 375 Part 507 Federal Register December 9, 1961. Applies to All DC-8 Aircraft, Serial Numbers 45252-45289, 45291-45306, 45376-45393, 45408-45413, 45416-45419, 45421-45431, 45433-45437, 45442-45445, 45526, 45565-45570, 45588-45606, 45609-45614, 45616-45622, 45624-45627, 45636. \n\n\tCompliance required as indicated. \n\n\tTo remove from service certain wing flap inboard actuating cylinders which, because of design characteristics, have failed in service and caused airplane operating difficulties, to remove adverse corrosion from any of the wing flap actuating cylinders, and to incorporate increased protection against corrosion for all flap actuating cylinders, the following shall be accomplished: \n\n\t(a)\tRemove all wing flap inboard actuating cylinder assemblies Douglas P/N 3715408-5001 or 3764264-5001 identified as having been manufactured by the Clary Corporation as follows: \n\n\t\t(1)\tCylinder assemblies with more than 5,000 hours' time in service shall be removed within 375 hours' time in service after the effective date of this AD. \n\n\t\t(2)\tCylinder assemblies with less that 4,625 hours' time in service shall be removed within 750 hours' time in service after the effective date of the AD. \n\n\t\t(3)\tCylinder assemblies with total time in service between 4,625 and 5,000 hours shall be removed prior to reaching a total time in service of 5,375 hours. \n\n\t(b)\tReplace each cylinder assembly removed per (a), with an assembly which has been inspected for freedom from cracks and for proper heat treatment, modified as necessary and reidentified, all in accordance with the instructions in Paragraph 2, section entitled Kit D and/or Kit C, of Douglas DC-8 Service Bulletin No. 27-118, Revision No. 1 to Reissue No. 1 or later, or with an FAA approved equivalent new part. \n\n\t(c)\tAll inboard cylinder assemblies (Clary or otherwise) which have been replaced in accordance with (b), shall be identified with a single band of green paint near the aft end of the barrel or with other suitable markings which will permit ready determination that an acceptable cylinder assembly is installed in the airplane. \n\n\t(d)\tWithin 900 hours' time in service following the effective date of this AD, replace all wing flap actuating cylinder assemblies (6 per airplane) with cylinder assemblies in which the barrels have been inspected for evidence of internal corrosion, cleaned and treated or replaced as necessary, and sealed, all in accordance with the instructions in Paragraph 2, section entitled Kits A, B, C, D, or E, of Douglas DC-8 Service Bulletin No. 27-118, Revision No. 1 to Reissue No. 1 or later, or with FAA approved equivalent new parts. Each of these modified or replacement cylinder assemblies shall be marked with two bands of green paint near the aft end of the barrel, or with other acceptable identifying markings. In those cases where a single band of green paint has been used to identify compliance of inboard cylinder assemblies with the provisions of paragraph (b) and such cylinder assemblies are determined to be eligible for reinstallation in accordance with this paragraph, only one additional band of green paint shall be added. \n\n\t(Douglas DC-8 Service Bulletin No. 27-118 covers this same subject.) \n\n\tThis directive effective December 9, 1961.