 They were upgraded to 525 hp Packard 2A-1500 engines, and sported a row of hooks on the bottom of the axle, used to guide the plane via cables on the deck.The FB-5 first flew October 7, 1926 and was delivered to the Navy beginning in the following January, carried on barges in Puget Sound from Boeing's factory to "Langley" anchored in Seattle's harbor.Hoisted aboard, their first official flights were from the carrier's deck.