COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Eurocopter AS 350 (Ecureuil) Series Helicopters AD/ECUREUIL/47 Amdt 1 Electric Hoist Installation 3/92 Applicability: All AS 350 helicopters as specified in the requirement document. Requirement: 1. Modify the hoist arm in accordance with paragraph 1 C 2 of Aerospatiale Service Bulletin 25-42 Revision 1. 2. Carry out an Electrical Bonding Check in accordance with paragraph 1 C 3 of Aerospatiale Service Bulletin 25-42 Revision 1. Note 1: Do NOT re-install the pyrotechnic cable cutting squib in accordance with Aerospatiale SB 25-42. AD/SUPP/12 refers. Note 2: DGAC AD 91-165-058(B) also refers. Note 3: AD/SUPP/13 also refers. Compliance: Requirement 1. Within 50 hours time in service after 06 March 1992, but no later than 6 June 1992. Requirement 2. Within 50 hours time in service after 06 March 1992, but no later than 6 June 1992; and on each occasion the hoist or the hoist arm is removed or disassembled. Background: An number of inadvertent firings of the pyrotechnic cable cutting device on a variety of helicopter electric hoists resulted in the removal of the pyrotechnic device from all hoists when used for personnel winching pending further investigation (AD/SUPP/12 refers). The pyrotechnic cable cut device is however still required to be fitted to hoists when hoisting cargo. AD/SUPP/13 requires modification and testing of the bonding between the component parts of the Air Equipment Hoist P/No 76370 (all variants). Compliance with this AD (AD/ECUERUIL/47) will improve the bonding between the hoist and the aircraft, and reduce the likelihood of un-commanded cable cuts when the pyrotechnic device is fitted for cargo winching. Note however that fitment of the pyrotechnic device for personnel winching is still prohibited by AD/SUPP/12 pending further investigation. Amendment 1 to this AD is issued to revise the applicability statement to include hoist P/No 76370-030.