Air NZ traces cause of second Dreamliner alert

Air NZ has traced a problem that forced a Dreamliner to return to Auckland Airport. Emergency services were scrambled Saturday after reports of a smell ''like electrical burning.'' Flight NZ103 was bound for Sydney before it had to return shortly after take-off. A spokeswoman said the smell on the aircraft was caused by an issue with part of the air conditioning system. The aircraft returned to service later the same day. That incident followed a problem July 12 when another Sydney-bound Air NZ Dreamliner flight was aborted shortly before take-off. Air NZ chief flight operations and safety officer David Morgan said then that following extensive testing it was determined what was being observed was a normal vapour which is released by this model of engine. <br/>