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The General Aviation and Commercial Division located in Washington, DC provides for the evaluation and approval of ATDs. Advisory Circular AC 61-136, FAA Approval of Aviation Training Devices and Their Use for Training and Experience provides the criteria for ATD approvals and use, and further divides them into two categories; Basic or Advanced ATD approvals (BATD/AATD). The letter of authorization provided by the FAA to the manufacturer specifies the training credits or experience requirements that can be acquired using that model trainer. These training devices are predominately used by general aviation flight schools providing flight training under 14 CFR part 61 or part 141 regulations. ATDs cannot be used for airman practical tests or type rating training requirements. 

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