Helicopter Westland Wessex HAS.1 Serial wa 20 Register XM839 used by Fleet Air Arm RN (Royal Navy). Built 1960. Aircraft history and location Aircraft History XM839 Fleet Air Arm Westland Wessex HAS.1, c/n WA020, f/f:? del Royal Navy as XM839, 23/03/1961 w/o 22/09/1961. 1961-09-22 Accident 700Sq(H)Sq/512 by Mar 1961, ditched and sank off Falmouth 22 Sep 1961, recovered to Lee for AIU. soc Oct 1961. Fleetlands dump by Aug 1965. Send Updates Use APP to upload photo @ (optional) When Now? / / Send