Aviation Machinist Mate (AD) Week 1 Practice Test 2026 – Comprehensive Exam Prep

The turbine section’s main job is to extract energy from the high-energy gases that exit the combustion chamber and use that energy to turn a shaft that drives the compressor and engine accessories. As the hot, fast gases flow over the turbine blades, they impart momentum to the blades, causing the turbine rotor to spin. That mechanical work is what powers the compressor (and any engine-driven accessories) so the engine can keep drawing in air, compressing it, and continuing the cycle.

This isn’t about compressing air or mixing fuel and air—that happens in other sections of the engine. Nor is it primarily about cooling exhaust; the turbine’s purpose is energy extraction to provide shaft horsepower to drive the compressor and accessories.