PT6A-15AG Engines: Need an engine replacement or upgrade for your Ag aircraft? Pratt & Whitney Canada has some 0 TSO PT6A-15AG PT6A-15AG PT6SMART(SM) engines available. Fly with the Eagle. Explore the available options for new and used engines and make your business “PT6SMART (SM)”. Email email@example.com or call 450-647-3682.