COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/35 Entry/Service Door Acoustic Seal 4/90 Applicability: Model 767 Line Position 1 through 244 and Line Position 246 through 262. Requirement: Action in accordance with Boeing SB 767-25-0123 R1. Note: FAA AD 90-01-05 refers. Compliance: Prior to 15 June 1990. Background: Country of origin AD. Migration of acoustic seal may result in incomplete arming of emergency evacuation slide. This must be armed for correct slide deployment during an emergency.