Helicopter Westland Whirlwind HAR.3 Serial wa 58 Register XJ394 XD764 used by Fleet Air Arm RN (Royal Navy). Built 1955. Aircraft history and location Aircraft History XD764 Fleet Air Arm Westland Whirlwind HAR.3, c/n WA58, ntu Royal Navy FAA as XD764. [duplicate serial] XJ394 Fleet Air Arm 1955-07-15ff: 15Jul55 del Royal Navy FAA as XJ394, 10Oct57 b/u Farnborough, 19Nov73. Send Updates Use APP to upload photo @ (optional) When Now? / / Send