AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998) , PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Agusta A109 Series Helicopters AD/A109/17 Amdt 1 Main Gearbox Gleason Crown Bolts 4/93 Applicability: All A109A and A109 AII helicopters up to and including aircraft S/N 7437 fitted with main gearbox (MGB) 109-0400-02-1, -3 & -5 up to and including MGB S/N 363. Note: MGB S/N 173, 176, 187, 207, 211, 267, 345 and 346 already comply. Requirement: Unless previously carried out replace gleason crown bolts in accordance with mandatory Agusta Bollettino Tecnico No 109-77 Rev A. Note: RAI AD 92-400 refers. Compliance: 1. For gearboxes with less than 1100 hours ’ time in service, prior to reaching 1200 hours’ time in service or by 31 January 1994, whichever occur first. 2. For gearboxes with more than 1200 hours ’ time in service, within 300 hours ’ time in service from 1 April 1993 or by 31 January 1994, whichever occurs first. Background: During routine maintenance of the MGB oil filter magnesium flakes were noticed. Disassembly of the gearbox revealed 4 bolts, P/N 109-0406-69-1, had sheared in the Gleason Crown assembly. This amendment raised in sequence to add a calendar time and to include the Italian AD reference.