AD 76-18-10

76-18-10 MESSERSCHMITT-BOLKOW-BLOHM (MBB): Amendment 39-2719. Applies to Model BO-105A and BO-105C helicopters, Serial Numbers 1 through 280, certificated in all categories. Compliance is required as indicated, unless already accomplished. To prevent failure of the engine mount assembly, accomplish the following: (a) For helicopters with 500 hours or less total time in service on the effective date of this AD, comply with paragraph (c) of this AD before the accumulation of 600 hours total time in service. (b) For helicopters with more than 500 hours total time in service on the effective date of this AD, comply with paragraph (c) of this AD within the next 100 hours time in service. (c) Determine the part numbers of the existing right outboard engine mount flanges and washers and their corresponding replacement flanges and washers and replace the existing flanges and washers with the new flanges and washers in accordance with paragraph 2 entitled "Accomplishment Instructions" of MBB BO-105 Service Bulletin No. 60-25, Revision 1, dated October 13, 1975 or an FAA-approved equivalent. This amendment becomes effective on October 1, 1976.