Discussion on Common Issues in the Maintenance of the Boeing 737NG Flight Control Cable System

Zhen Liu （ Engineering Technology Branch of China Southern Airlines Co., LTD, Zhengzhou, Henan 450014, China ）

Abstract

This paper aims to systematically examine the common issues encountered in the routine maintenance, scheduled inspection, and troubleshooting of the flight control cable system of the Boeing 737NG. It first outlines the basic configuration and operating principles of the 737NG cable system, and then provides an in-depth analysis of typical failure modes—including cable wear, corrosion, abnormal tension, pulley seizure, loosened fittings, and improper lubrication—focusing on their causes, inspection methods, and potential risks. On this basis, targeted preventive maintenance strategies, recommendations for the application of advanced inspection technologies, and optimization measures for personnel training are proposed. The study indicates that by strengthening refined, life-cycle-oriented management of the cable system, strictly implementing maintenance manual procedures, and actively introducing predictive maintenance concepts, the reliability of this critical system can be significantly enhanced, thereby providing solid assurance for the safe and efficient operation of the 737NG fleet.

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