I think I am correct in saying that the last twelve S76A airframes actually conformed to the S76C airframe standard. 2-BYDF was in that batch. We searched everywhere for just the right airframe for that job. The Starboard Pax door was sealed into place so from the outside she appeared not to have he door (the escape panel window was fitted). For ground handling of VVIP pax this single port door configuration was helpful. When we got her she was an S76A+ only and cleared to 10,500 lb only. BHL did the upgrade to A++ changing a section of skin on either side just by the engine bays and the engines went back to Turbomeca for their upgrade. All came together and we put the light weight dog house on her ( nightmare to fit but worth it) It was a very interesting mod programme. I think we embodied a total of 96 BHL mods (some just a bolt change or addition, others more serious) . She had just 74 hours total when starting to operate for us