AC 20-143, ADVISORY CIRCULAR: INSTALLATION, INSPECTION, AND MAINTENANCE OF CONTROLS FOR GENERAL AVIATION RECIPROCATING AIRCRAFT ENGINES (06 JUN 2000)

AC 20-143, ADVISORY CIRCULAR: INSTALLATION, INSPECTION, AND MAINTENANCE OF CONTROLS FOR GENERAL AVIATION RECIPROCATING AIRCRAFT ENGINES (06 JUN 2000)., A review of service history on engine control installations indicates that a significant percentage of the problems are related to maintenance. Of the control system problems related to maintenance, approximately 75 percent of the problems with these systems result from lack of proper maintenance of airplane manufacturer installed engine controls. The other 25 percent of the service problems originate from a lack of maintenance of the engine manufacturers’ throttle, mixture, and propeller governor levers/linkages. Most airplane or engine maintenance manuals lack detailed information on inspection and installation of engine controls. Therefore, this advisory circular (AC) presents information regarding the inspection, maintenance, and installation of engine controls with emphasis on the airframe portion of these systems. It provides guidance to design and maintenance personnel to reduce the number of airplane accidents and incidents related to the loss of engine power control. This material is neither mandatory nor regulatory in nature and does not constitute a regulation. This AC is provided to supplement, but not replace the procedures in the manufacturers' maintenance manuals. Where the content of this AC differs from, or conflicts with, the manufacturer's maintenance manual, instructions contained in the manufacturer's manual take precedence over the guidelines provided in this AC.