COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/80 Thrust Reverser System Flow Restrictors 11/94 Applicability: All Boeing 767 series aircraft equipped with Pratt and Whitney JT9D-7R4 or General Electric CF6-80A series engines. Requirement: Replace the existing thrust reverser system flow restrictor devices with check valve restrictors in accordance with Boeing Alert Service Bulletin 767-78-0064 for aircraft equipped with CF6-80A series engines or Alert Service Bulletin B767-78-0065 for aircraft equipped with P&W JT9D-7R4 series engines. Note: FAA AD 94-14-01 also refers. Compliance: Unless previously accomplished, no later than 31 January 1996. Background: This AD is issued following reports of leakage across the actuator piston seals which may result in an inadvertent deployment of a thrust reverser in flight and subsequent reduced controllability of the aircraft.