COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Beechcraft 1900 Series Aeroplanes AD/BEECH 1900/24 Ground Fine Switch 10/98 Applicability: Model 1900D aeroplanes with serial numbers UE-1 through UE-271 inclusive. Requirement: Modify the ground idle low pitch stop system by incorporating Raytheon 'Ground Fine Switch Installation Kit' No 129-5200-1 in accordance with the Accomplishment Instructions of Raytheon Aircraft Mandatory Service Bulletin No 2714 issued June 1997. Note: FAA AD 98-13-11 Amdt 39-10599 refers. Compliance: Within 800 hours time in service after the effective date of this directive. This airworthiness directive becomes effective on 10 September 1998. Background: This directive is intended to prevent a loose or misrigged ground fine switch, which could result in a hard landing causing structural damage to the airframe and possible passenger injury.