COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Cessna 337 Series Aeroplanes AD/CESSNA 337/9 Rear Engine Idle RPM - Adjustment and Placard Installation 8/71 Applicability: All models. Requirement: 1. Readjust 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: TAKE AND TAKE-OFF LEAD WITH REAR ENGINE POWER CHECK RPM AND FUEL FLOW. Note: The operator may make and install a temporary placard, using letters of 1/8" minimum height, until a permanent placard as detailed in Cessna SL No. ME71-21 is obtained from the manufacturer and installed. Compliance: Within 10 hours time in service after 25 August 1971.