COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 106 CIVIL AVIATION SAFETY AUTHORITY
SCHEDULE OF AIRWORTHINESS DIRECTIVES
Allison Turbine Engines - 250 Series
AD/AL 250/8
Amdt 1
Helical Power Train Drive Gear Internal Spline Inspection
2/71
Applicability: All 250-C18 series non Blue Ribbon gearboxes and all Blue Ribbon gearboxes used with non Blue Ribbon turbines.
Document: Allison 250 CSL - 35 Rev. 1.
Compliance: Between 700 and 775 hours’ time in service since new or last overhaul after 26 February 1961.