COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 336 Series Aeroplanes AD/CESSNA 336/7 Rear Engine Idle Rpm - Adjustment and Placard Installation 3/72 Applicability: All models. Requirement: 1. Adjust the rear engine idle setting from 600 + 25 RPM to 650 + 25 RPM and readjust the idle mixture accordingly. 2. Install a permanent placard adjacent to the tachometer as follows: TAXI AND TAKE-OFF LEAD WITH REAR ENGINE POWER CHECK RPM AND FUEL FLOW. Note: A suitable placard is detailed in Cessna SL ME71-21. Compliance: Within 100 hours time in service after 31 March 1972.