INTRODUCTION
The majority of modern aircraft, primarily the large transport type, are equipped with certain systems that are not necessary for the actual operation and flight of the airplane but are needed for the comfort and convenience of the crew and passengers and may be required by Federal Aviation Regulations (FARs). Some of these systems are important for the safe operation of the aircraft under a variety of conditions, and some are designed to provide for emergencies.
Systems not essential to the actual operation of the aircraft are commonly called auxiliary systems. Among such systems are ice and rain protection, ...