COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Boeing 737 Series Aeroplanes AD/B737/65 Radio Control Panels 2/92 Applicability: Boeing 737 series aircraft equipped with Boeing part number 285U0037-104, -105, - 201, -202 or -203 series radio control panels. Requirement: Remove radio control panels, part numbered 285U0037-104, -105, -201, -202 and - 203 and replace with part numbers 285U0037-304, -305, -301, -302 and -303 respectively. Note: FAA AD 91-21-12 refers. Compliance: Prior to 12 January 1993. Background: Country of origin AD. To prevent uncommanded frequency changes of the high frequency (HF) and very high frequency (VHF) radios.