COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 90 and 65-90 (King Air) Series Aeroplanes AD/BEECH 90/92 Outflow/Safety Valve 3/98 Applicability: All 65-90, A90, B90, C90 and C90A aircraft, serial number LJ-1 through LJ-1302, E90 aircraft serial number LW-1 through LW-347 and F90 aircraft, serial number LA-2 through LA-236. Requirement: Inspect and if necessary replace the outflow/safety valve in accordance with the procedures detailed in Beech SB 2484 Rev 1 dated October 1995. No person shall install on any aircraft any Outflow/Safety Valve found to be unserviceable in accordance with this directive. Note: FAA AD 97-25-01 Amdt 39-10224 refers. Compliance: Within 200 hours' time in service or 4 months, whichever occurs first, from the effective date of this directive. This airworthiness directive becomes effective on the 26 February 1998. Background: Manufacturing problems with the safety valve may cause a rapid decompression of the aircraft should a valve failure occur.