paris france air accident investigation agency say tuesday would lead probe engine explosion prompt emergency land air france a380 superjumbo canada 500 people board saturday reuters report monday canada france unite state debate lead investigation accident take place high greenland decision hand control bea mean investigators begin plan unusual search potentially inhospitable terrain find miss 3-metre- 9.8-foot -wide fan rip engine midair nobody injure incident air france flight 66 originate paris bind los angeles declare mayday divert goose bay labrador bea confirm engine main fan inlet become detach plan danish help search miss part envisage depend snow condition bea spokesman say preliminary read plane data recorder canada identify search area bea say damage limit right-outer no.4 engine immediate surround boost chance aircraft fly back europe examination a380 world large airliner european icon history attract debate high public profile start probe appear exception aviation law job investigate belong denmark since blowout happen greenland part denmark self-government domestic affairs three major aviation nations involve equip sophisticate test equipment denmark exercise right delegate main role people brief talk say take days agree take place canada see keen keep control case aviation experts say france priority plane build design register operate canadian investigators remain involve along counterparts unite state france denmark whose expertise need track miss fan help airbus u.s. engine maker engine alliance co-owned general electric pratt whitney experts say engine accidents rare must investigate thoroughly significant damage cause 2010 qantas a380 make emergency land singapore rolls-royce engine explode shortly take-off investigators blame badly manufacture part france lead investigation a380 engine explosion