Helicopter Sikorsky H-19D Chickasaw Serial 55-646 Register N91AS 52-7618 used by US Army Aviation Army. Built 1954. Aircraft history and location Aircraft History 52-7618 US Army Aviation 1954-02-18Sikorsky S-55 c/n 55-646, ff:? del US Army as H-19D, 52-7618, 18Feb54. N91AS - Westec Air Inc at Mesa, AZ Jan86-Sep13, expired 2015-01 Jan15 stored/derelict GABS blue white c/s without rotors and with N68397 Send Updates Use APP to upload photo @ (optional) When Now? / / Send