Part Number O540B4B5-9491-R Engine Reman in stock with ready to ship. Get an instant quote for Cessna Aircraft Company part number O540B4B5-9491-R by filling form below with your desired order quantity, targeted price and the expected order-fulfilment date. Get instant quote for O540B4B5-9491-R. Our dedicated account manager will get back to you within 15 minutes.