Please check my other auctions as well. This is for a Frontier Airlines manual, typically handed out to mechanics as they passed thru a system school. This one is for the Convair 580, powered by the Allison turboprops and deals with all the ins and outs of the fuel system. The manual is in great shape for its age, the covers are a little dirty and the mechanic wrote his name in the top corner as you can see. Thanks for looking and if you have any questions, please ask.