77-10-01 MCDONNELL DOUGLAS: Amendment 39-2895. Applies to DC-4 and C-54 series airplanes, certificated in all categories, using Hamilton Standard propellers. \n\n\tCompliance required by the first engine change after the effective date of this AD or October 1, 1977, whichever occurs earlier, unless previously accomplished in accordance with AD 55-15-03 as amended by Amendment 55-24 to Part 507. \n\n\tTo increase fire resistance integrity of the propeller feathering system against damage by a powerplant fire, all flexible hose components of propeller feathering lines forward of the firewall must be replaced with lines and fittings which will meet the fire resistance requirements of the hose assemblies specified in (a) through (f) herein. However, if the feathering lines in Zone I include a section of steel tubing, flexible hose assemblies located forward of the cylinders and connecting to the governor are not affected by this directive. \n\n\tThe following flexible hose assemblies are acceptable for use in this application: \n\n\t(a)\tResistoflex SSFR-3800-10 hose assemblies. \n\n\t(b)\tAeroquip 680-10S hose assemblies with Aeroquip 304 protective sleeves over end fittings (Aeroquip Assembly P/N 304000). \n\n\t(c)\tAeroquip 309009 hose assemblies. \n\n\t(d)\tAeroquip 309009-8S hose assemblies (where feathering system requires this size). \n\n\t(e)\tAeroquip 634000-8 or -10, as applicable, hose assemblies. \n\n\t(f)\tHose assemblies that fully comply with FAR 37.140 (TSO-C42) and have a pressure rating equal to or greater than that of the propeller feathering system installed on the airplane. \n\n\t(g)\tEquivalent hose assemblies or other means of compliance may be used when approved by the Chief Aircraft Engineering Division, FAA Western Region. \n\n\tSpecial flight permits may be issued in accordance with FAR's 21.97 and 21.199 to operate the airplane to a base for the accomplishment of this AD. \n\n\tThis supersedes AD 55-15-03, as amended by Amendment 55-24 to Part 507. \n\n\tThis Amendment becomes effective June 16, 1977.