FAA AMT Airframe Practice Exam 2026 – Complete Exam Prep Guide

A mixing valve is a device that allows for the control and mixing of hot, cool, and cold air in a compressor bleed air air-conditioning system. Its main purpose is to regulate and maintain a desired temperature within the system based on outside air temperature changes. Options B and C are incorrect because they pertain to changing airflow pressure, not temperature regulation. Option D is incorrect because filtering contaminants is not the intended purpose of a mixing valve in this system.