The suspected gearbox problem is related to the MAYDAY call made by the crew on RTB.
http://www.tc.gc.ca/aviation/applica...asp?Position=1
Record #7 Cadors Number: 2009A0212
Reporting Region: Atlantic
Occurrence Information Occurrence Type: Accident
Occurrence Date: 2009/03/12 Occurrence Time: 1215 Z
Day Or Night: day-time Fatalities: 1 Injuries: Canadian Aerodrome ID: Aerodrome Name: Occurrence Location: 472605N515658W
Province: Country: CANADA World Area: North America
Reported By: NAV CANADA AOR Number: 105029-V1
TSB Class Of Investigation: 3
TSB Occurrence No.:
Event Information
Engine oil problem/Forced landing/Collision with terrain/Diversion
Aircraft InformationFlight #: CHI91 Aircraft Category: Helicopter
Country of Registration: CANADA Make: SIKORSKY Model: S92A
Year Built: 2006
Amateur Built: No Engine Make: GENERAL ELECTRIC Engine Model: CT7-8A Engine Type: Turbo shaft Gear Type: Land Phase of Flight: Cruise
Damage: Destroyed Owner: COUGAR HELICOPTERS INC. Operator: COUGAR HELICOPTERS INC. (4791)Operator Type: Commercial Detail InformationUser Name:MacQuarrie, JackDate:2009/03/12 Further Action Required:Yes O.P.I.:Maintenance & Manufacturing
Narrative:CHI91, S92, enroute from St. John's (CYYT) to the Hibernia Oil Platform at 12:15Z, declared MAYDAY due to a main gear box oil pressure problem and requested to return to St. John's. Air Traffic Control cleared the flight as requested. At 12:25Z aircraft ditched at position 472605N515658W.