Helicopter Sikorsky H-19D Chickasaw Serial 55-834 Register 54-1420 used by US Army Aviation Army. Built 1955. Aircraft history and location Aircraft History 54-1420 US Army Aviation 1955-01-24Sikorsky S-55 c/n 55-834, ff:? del US Army as H-19D, 54-1420, 24Jan55. Send Updates Use APP to upload photo @ (optional) When Now? / / Send