COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 767 Series Aeroplanes AD/B767/65 Bulk Cargo Ventilation Valve 5/92 Applicability: Model 767 Series as listed in the Requirement Document. Requirement: Remove the bulk cargo ventilation flapper valve in accordance with Boeing Alert SB 767-21A0098. Note: FAA AD 92-02-12 Amdt 39-8148 refers. Compliance: Within 4000 Hours Time in Service after 2 March 1992. Background: The FAA has received a report of a cargo compartment flapper valve that did not close during a functional check of the bulk cargo compartment fire extinguishing system. This condition could result in loss of the extinguishing agent through an open flapper valve.