Incident at ST. JOHN'S INTL NL (CYYT)


2003-08-21: TSB Update - 2003-08-20 - A03A0098:The Cougar Helicopters Sikorsky S61, registration FTIG, was en route to an oil rig platform on the Grand Banks of Newfoundland. At approximately 20 nautical miles south of St. John's International airport the crew declared an emergency due to hydraulic problems. They isolated the aux hydraulic system, returned to St. John's and landed uneventfully at 1029 NDT while AFF crews stood by. Maintenance inspected the hydraulic system and found a leak in the aux filter bowl area. The leak source was traced to an o-ring that had been damaged. The hydraulic system had undergone maintenance the previous night which included servicing the aux filter. During reassembly a new o-ring and Teflon backing ring were installed. A moto-gen was completed which provides hydraulic system pressure for the purpose of leak a check; however, no leaks were found. It is suspected that the o-ring was damaged during re-assembly after the filter was reinstalled but the leak did not begin until after the aircraft was started for the incident flight.
2003-08-19: CHI51 a Cougar S61 Helicopter was 20 miles south of St. John's bound for the Glomar Rig when it decared an emergency due to a hydraulic problem. The helicopter returned to St. John's, requested CFR on standby, and landed at 1259Z without further incident.


CADORS Number 2003A0483
Occurrence Type Incident
Reported By NAV CANADA
Occurred At 2003-08-19 - 12:45
Day or Night? Day-time
Fatalities 0
Injuries 0
Aerodrome ID CYYT
Aerodrome Name ST. JOHN'S INTL NL (CYYT)
Geographic Location Newfoundland and Labrador, Canada, North America, Atlantic Region, St. John's
TSB Occurrence Number A03A0098
TSB Class of Investigation Class 5
AOR Number 31736
Reported By NAV CANADA
Categories System/component failure or malfunction [non-powerplant],Other

Aircraft Details (1 aircraft)

Type Helicopter
 Silhouette image of Helicopter
Canadian Registration FTIG | Flightaware (Registration) | Flightaware (Tracking) | AvHerald
Foreign Registration
Country of Registration Canada
Occurrence Type Incident
Owner VIH Aviation Group Ltd
Operator COUGAR HELICOPTERS INC. (4791) Commercial
Make  Silhouette image of SIKORSKY
Model S61N
Year Built 1972
Engine Type Turbo shaft
Engine Model CT58-140-1
Gear Type
Private No
Amateur Built No
Flight Number CHI51
Flight Rule
CARS Subpart
Phase of Flight Cruise
Damage Unknown
Fatalities 0
Injuries 0
Events Diversion,Declared emergency/priority,Hydraulic problem

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