Which ATA chapter is associated with environmental control within the cabin?

Which ATA chapter is associated with environmental control within the cabin?

• A. ATA 12 Servicing - Routine Maintenance
• B. ATA 22 Auto Flight
• C. ATA 23 Communications
• D. ATA 21 Air Conditioning and Pressurization

Answer: (D)

Cabin environmental control is the function that manages air temperature, pressure, and ventilation inside the aircraft. The chapter that covers this area is Air Conditioning and Pressurization, which includes the systems and components responsible for conditioning cabin air and maintaining the proper cabin pressure. That’s why this option is the best match: it directly addresses the environmental control within the cabin, including elements like air conditioning packs, pressure regulators, and outflow valves. The other topics correspond to different areas—servicing deals with routine ground servicing, auto flight covers automated flight control systems, and communications handles onboard radios and data links—so they do not specifically address the cabin’s environmental control.

Cabin environmental control is the function that manages air temperature, pressure, and ventilation inside the aircraft. The chapter that covers this area is Air Conditioning and Pressurization, which includes the systems and components responsible for conditioning cabin air and maintaining the proper cabin pressure. That’s why this option is the best match: it directly addresses the environmental control within the cabin, including elements like air conditioning packs, pressure regulators, and outflow valves. The other topics correspond to different areas—servicing deals with routine ground servicing, auto flight covers automated flight control systems, and communications handles onboard radios and data links—so they do not specifically address the cabin’s environmental control.