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/42 Hydraulic Power - Emergency Hydraulic Hand Pump 4/91 DM Applicability: Jetstream Series 3100 Aircraft construction number 601 to 646, 648 to 655, 658 and 660. Requirement: Inspect and/or modify subject aircraft in accordance with British Aerospace Service Bulletin, CAA (UK) Mandatory, 29-JM 7360 Revision 1. Compliance: As specified in the Requirement Document but with a revised effectivity date of 18 April 1991 for Australian registered aircraft. Background: Cases have been reported of difficulty in gaining access to the emergency hydraulic hand-pump following hydraulic systems failures.