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

Airworthiness Directive - AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts Airworthiness Directive - AD/A109/17 Amdt 1 - Main Gearbox Gleason Crown Bolts CASA Airworthiness Directive Jurisdiction:Commonwealth of Australia;CorporateName:Civil Aviation Safety Authority; Issue 4/1993,Rotorcraft,Agusta A109 Series Helicopters,Main Gearbox Gleason Crown Bolts,17 Amdt 1 DellaCa, Donna 2 1 2022-10-20T23:36:00Z 2022-10-20T23:37:00Z 1 193 1104 Office of Parliamentary Counsel 9 2 1295 16.0000 2006-09-21T00:00:00Z Toolkit http://www.activepdf.com 2022-10-20T00:00:00Z 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.