Canadian authorities say Sikorsky-92 A helicopters need gearbox part replaced . FAA to issue emergency directive for repair , Canadian safety regulator says . Four British Army helicopters are in Scotland to replace a part . Sikorsky-92 A crashed last winter off Newfoundland ; 17 people died .
Canadian authorities warn Sikorsky-92 A helicopters need gearbox part replaced . FAA to issue emergency directive ordering repair , Canadian safety board says . Four British Coastguard helicopters grounded in Scotland to replace a part . Sikorsky-92 A crashed last week off Newfoundland ; 17 people died .