When filling out AF Form 487, which documentation are you checking for currency?

In the context of filling out AF Form 487, the correct choice focuses on essential documentation that ensures a thorough understanding of equipment operation and safety protocols. The generator training letter, one-line diagram, and operating instructions provide critical information necessary for the proper operation and maintenance of the generator system.

The generator training letter typically confirms that operators have received the necessary training, ensuring they are competent in safely handling the equipment. The one-line diagram is vital for understanding the electrical layout and system design, which aids in recognizing how different components interact. Operating instructions provide step-by-step guidance on how to use the generator effectively, ensuring that operators know how to start, shut down, and troubleshoot the equipment.

Ensuring that these documents are current is crucial for maintaining operational safety and efficiency. They directly relate to the training and procedural compliance required for safe generator operation and maintenance, which is why this option is the most appropriate answer for checking currency on AF Form 487.