66-06-01\tBOEING: Amdt. 39-197 Part 39 Federal Register February 22, 1966. Applies to Model 707-200 and -300 Series Airplanes Equipped with Pratt & Whitney JT4 Engines.\n \n\tCompliance required as indicated, unless already accomplished. \n\n\tTo prevent loose B-nut on the thrust reverser P(s4) lines, accomplish one of the following or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region.\n\n\t(a)\tWithin the next 1,200 hours' time in service after the effective date of this AD, replace P(s4) tube assemblies (located between the P(s4) engine bleed port and the thrust reverser directional control valve) that incorporate stainless steel 17-4 PH CRES sleeves with tube assemblies that incorporate case-hardened 316 CRES sleeves in accordance with Boeing Service Bulletin 2228, dated August 9, 1965, or later FAA-approved revision; or \n\n\t(b)\tWithin the next 1,200 hours' time in service after the effective date of this AD, replace P(s4) tube assemblies (locatedbetween the P(s4) engine bleed port and the thrust reverse directional control valve) that incorporate stainless steel 17-4 PH CRES sleeves with tube assemblies that incorporate nickel plated carbon steel sleeves or silver plated carbon steel sleeves in accordance with Boeing Service Letter 6-7161-4-8966, dated May 11, 1965, and within the next 3,000 hours' time in service after the effective date of this AD, replace the assemblies that incorporate nickel or silver plated carbon steel sleeves with tube assemblies that incorporate case- hardened 316 CRES sleeves in accordance with Boeing Service Bulletin 2228, dated August 9, 1965, or later FAA-approved revision.\n \n\tThis supersedes AD 65-25-01. \n\n\tThis directive effective February 22, 1966.