paris french investigators prepare intricate operation repatriate air france airbus a380 passenger jet force make emergency land canada one engines come apart mid-flight people familiar maneuver say airbus superjumbo divert goose bay labrador sept. 30 one four engines explode greenland send front part engine include 3-metre-wide fan ice sheet 37,000 feet 500 passengers crew report bang vibration pick two replacement jet wait hours onboard due problems accommodate world large airliner remote military airport aircraft remain strand french-led investigators collect evidence develop plan return france make roughly 2,300 nautical mile 4,260 km trip need switch engines help mammoth jet fly smoothly first rump break engine take wing fly wales manufacturer general electric examine cardiff repair workshop people say spare engine mount right wing out position damage one use balance weight flight engine operable people decline quote plan yet announce france bea accident agency decline comment operation fetch double-decker jet challenge errand trigger mid-air explosion part engine retrieve helicopter greenland oct. dispatch bea headquarter paris investigators still face tricky search uncertain weather condition try find miss elements bury snow although nobody injure engine break-up lead could lengthy investigation ensure aircraft expose risk damage high-speed engine debris experts say incidents rare however gp7200 engines use air france a380s make engine alliance co-owned ge pratt whitney 2010 qantas a380 engine build uk rival rolls-royce blow shortly take-off investigators cite poorly manufacture part damage a380 fly france investigate engine blast