COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 727 Series Aeroplanes AD/B727/120 Fuel Tank Access Doors 9/90 Applicability: All models. Requirement: Action in accordance with Boeing SB 727-28-0101. Compliance: Prior to 30 October 1991. Background: The incorporation of the Service Bulletin enables aircraft to comply with FAR 25.963(e) which provides for some fuel tank access panels to have a higher resistance to impact to reduce possibility of penetration from engine debris or objects thrown by the aircraft tyres.