COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES British Aerospace BAe 3100 (Jetstream) Series Aeroplanes AD/JETSTREAM/33 Inhibition of TTL Test and Stall Protection Test Functions During Flight Applicability: As listed in Requirement Document. Requirement: Action in accordance with British Aerospace SB 24-JM7657A. Compliance: Prior to 31 August 1989. 6/89 Background: This AD is raised to ensure that inadvertent selection of the TTL or stall protection test switches during flight will not result in an unsafe condition.