Helicopter Bell D-250 / YHO-4 Serial 4 Register 62-4202 used by US Army Aviation Army. Built 1962. Aircraft history and location Aircraft History 62-4202 US Army Aviation Bell 206/YHO-4 cn4, ff:08Dec62 del US Army as YHO-4 62-4202, 1963 redesig YOH-4, 1963 wfu & presumed scr, unk. Send Updates Use APP to upload photo @ (optional) When Now? / / Send