Under which ATA chapter would you classify environmental control systems?

Environmental control systems are classified under chapter 28 of the ATA (Air Transport Association) specifications. This chapter specifically deals with the various aspects of aircraft electrical power systems, including environmental control systems which encompass heating, ventilation, air conditioning (HVAC), and oxygen systems.

By being classified under chapter 28, environmental control systems are highlighted as critical components necessary for maintaining a safe and comfortable environment for crew and passengers. These systems are vital for ensuring the overall operational efficiency of the aircraft while adhering to safety standards and regulations.

In contrast, other chapters mentioned focus on different systems: chapter 21 pertains to air conditioning and pressurization, chapter 32 relates to landing gear, and chapter 36 discusses autopilot systems. None of these options accurately encapsulate the full scope and functionality of environmental control systems in relation to electrical and power systems aboard the aircraft.