COMMONWEALTH OF AUSTRALIA CIVIL AVIATION ORDERS CIVIL AVIATION SAFETY AUTHORITY PART 105 SCHEDULE OF AIRWORTHINESS DIRECTIVES GULFSTREAM (GRUMMAN) G.159 SERIES AEROPLANES AD/G159/16 Engine Breather Overheat Detector - Max Setting 11/71 Applicability: All models. Requirement: Set engine breather overheat detector setting to operate at a temperature not exceeding 260oC. Note: Rolls Royce Notice to Operators No. 1018, Issue 3 also refers to this subject. Compliance: Before 30 November 1971.