Helicopter Westland Wessex HAS.1 Serial wa259 Register XS879 used by Fleet Air Arm RN (Royal Navy). Built 1966. Aircraft history and location Aircraft History XS879 Fleet Air Arm Westland HAS.1, c/n WA259, f/f: ? del Royal Navy as XS879, 03/02/1966 w/o 09/08/1967. 1967-08-09 A Subic Bay Harbour off Subic Bay 826Sq/342-H by spring 1966. Ditched and sank off HMS Hermes while operating off Subic Bay, Philippines on 9 Aug 1967. Send Updates Use APP to upload photo @ (optional) When Now? / / Send