FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

The primary purpose of the crossfeed system is to allow the feeding of any engine from any tank. This system provides flexibility in case one fuel tank runs low or encounters a problem, enabling the aircraft to transfer fuel from one side to the other to maintain proper balance and operation of the engines. Option A, to extinguish engine fires, is not the primary purpose of the crossfeed system. Option B, to cool the fuel, is not a typical function of the crossfeed system. Option D, to improve fuel efficiency, is not the main purpose of the crossfeed system either.