Simulator regulations are one of the most commonly misunderstood areas in flight training. In this episode of the CFI Bootcamp's Power Hour, we sort out the terminology and the regulations behind Flight Simulation Training Devices, Full Flight Simulators, Flight Training Devices, and Aviation Training Devices. We walk through AC 61-136B, the role of the Letter of Authorization, the specific Part 61 references that govern credit for the private, instrument, commercial, and ATP levels, and how to make correct logbook entries when the flight time columns stay blank. We close with a candid look at device fidelity and where these trainers serve students well and where they mislead. Essential listening for flight instructors, CFI candidates, and pilots using simulation to stay proficient.