83-11-01 R1 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS): Amendment 39-4657 as amended by Amendment 39-4959. Applies to all SNIAS Model AS350B, AS350C, AS350D, and AS350D-1 helicopters, certificated in all categories, that have Air Cruiser flotation kits installed in accordance with STC SH4032SW or SH2825SW, and delivered by AHC prior to April 4, 1983. \n\n\tCompliance is required as indicated unless already accomplished in accordance with Aerospatiale Helicopter Corporation Service Bulletin No. SB 350-18, dated April 4, 1983. \n\n\tTo prevent possible failure of the Air Cruiser emergency flotation system, accomplish the following prior to further overwater flight. \n\n\t(a)\tReroute harness and add 1/4 inch diameter heat shrink tubing to electrical harness in accordance with Figure 1. \n\n\t(b)\tAdd 3/4 inch diameter heat shrink tubing to encase both mechanical cable and electrical harness. Assure that 3/4 inch tube overlaps 1/4 inch shrink tubing as shown in Figure 1. \n\n\t(c)Install four supporting clamps, P/N MS21919WDG2, on each float bottle valve assembly side plate (drill and fit per Figure 1). \n\n\t(d)\tInstall three clamps, P/N MS21919WDG36, on each cross tube to support squib harness (reference Figure 2). Ground strap is to be clamped at the lowest point on cross tube that will allow float to be pivoted between operating and ground handling position. \n\n\t(e)\tInspect the harness installation and perform the electrical test described in Air Cruiser's Overhaul Manual, reference 25.60.93, page 706, or FAA approved equivalent. \n\n\t(f)\tMaterials necessary to complete the modification are listed below. \n\n\n\nDESCRIPTION\nPART NUMBER \nSOURCE\nQUANTITY \nRivet\nMS20470AD3-4\nStd. hdw\n4 \nBracket\nAN743-13\nStd. hdw\n2 \nClamp\nMS21919WDG2\nStd. hdw\n8 \nClamp\nMS21919WDG36\nStd. hdw\n6 \nScrew\nNAS603-9P\nStd. hdw\n4 \nWasher\nAN960-10L\nStd. hdw\n4 \nNut\nMS21044N3\nStd. hdw\n4 \nHeat Shrink Tubing\n3/4 Inch\nRaychem\n10 ft.\n\n\n(Mouser Alt) \n\nHeatShrink Tubing\n1/4 Inch \nRaychem\n3 ft.\n\n\n(Mouser Alt)\n\n\n\t\tAmendment 39-4657 became effective June 13, 1983. \n\t\tThis Amendment 39-4959 becomes effective December 20, 1984. \n\n\n\n\t\t\t\t\t\tFIGURE 1, PART 1 \n\t\t\t\t\t\t AD 83-11-01 \n\n\n\n\nHeat Shrink Tubing to Extend Inboard Past \nClamp on Cross Tube. (High & Low Skid Gear) \n\n\n\tNOTE: \n\t\tGround strap to be clamped at lowest point on \n\t\tCross tube that will allow float to be pivoted \n\t\tbetween operating and ground handling position. \n\t\tDo not clamp or otherwise secure ground strap to \n\t\tmech. control & elect wire bundle except where \n\t\tboth can be clamped together on cross tube. \n\nFIGURE 2 \nAD 83-11-01