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/8 Engine Mounting Structure Attachment Bolts 10/85 Applicability: All Jetstream Series 3100 with S/Nos. 601 to 607, 609 to 633, 635 to 640 and 649. Requirement: Action in accordance with British Aerospace S.B. 71-JA850625. Compliance: As per Requirement Document. Background: Each engine mounting structure incorporates two special bolts. It has been found that some batches have been insufficiently heat treated during manufacture.