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.
|Occurred At||- 12:45|
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Aircraft Details (1 aircraft)
|Canadian Registration||| Flightaware (Registration) | Flightaware (Tracking) | AvHerald|
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