COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Fokker F50 (F27 Mk 50) Series Aeroplanes AD/F50/25 Radio Magnetic Indicators Wiring Change 13/89 Applicability: F27 Mark 50 aircraft with Serial Numbers 20103 to 20108 inclusive and 20110 to 20141 inclusive Requirement: Modify in accordance with Fokker 50 Service Bulletin SBF 50-34-013. Note: RLD Airworthiness Directive BLA 89-097 refers. Compliance: Prior to 1 April 1990. Background: Errors of up to 5 degrees are possible on the RMIs due to incorrect wiring. These exceed permissible limits.