COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Gates Learjet 24 & 25 Series Aeroplanes AD/LEARJET/33 Stall Warning Accelerometer 2/86 Applicability: 24 and 25 series aircraft with S/No's 24A-011, 24A-012, 24-015, 24-019, 24-031, 24- 043, 24-050, 24-051, 24-055, 24-060, 24-065, 24-087, 24-096, 24-100 to 24-357, 25- 206 to 25-336, 25-338 and on. Requirement: Gates Learjet SB 23/24/25-301B. Note: FAA AD 82-01-05R2 also refers. Compliance: Within 220 hours time in service after 28th February 1986 and thereafter at every 220 hours time in service. Background: Faulty accelerometers or an improperly wired stall warning system when coupled with an inadvertent stick pusher operation during cruise flight could present control forces and flight upset beyond the capability of the crew to recover.