COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES AMD Falcon 50 and 900 Series Aeroplanes AD/AMD 50/6 Flight Control Area at Frame 25 9/93 Applicability: Model F900 with a FJC-type interior. Model F900 with a DASSAULT AVIATION-type interior. Requirement: Action in accordance with the technical requirements of DGAC AD 92-067-010(B). Note: Dassault Aviation SB F900-113 and SB F900-115 refer. Compliance: As specified in the Requirement Document with a revised effective date of 19 August 1993. Background: Water accumulation in the underfloor area at frame 25 would create the possibility that the engine and flight controls could jam in the event of extreme low temperature conditions. This Directive requires certain actions and checks of the water system, and a modification which is designed to improve underfloor heating. s