What happened
A Canadian Coast Guard Bell 212 helicopter was conducting a routine mission to resupply the lighthouse keeper's residence on Cabot Island, Newfoundland. The operation involved transporting 40-gallon plastic barrels of fresh water from Newtown to the island using a slung-load method, with the load suspended 120 feet beneath the aircraft.
On the return leg of the mission, the aircraft was carrying a netload of nearly empty barrels. Shortly after departing the island staging area, the aircraft's descent brought the slung load into contact with the water. This contact generated significant drag forces that caused the hook assembly to tear away from the aircraft, disrupting the flight controls. The resulting instability led to mast bumping and the subsequent separation of the main rotor from the mast. The aircraft struck the water, and the pilot sustained fatal injuries. Witnesses on the island observed debris and the barrel load floating near the shore shortly after the impact.
The investigation
The investigation focused on the sequence of events leading to the loss of control and the mechanical failure of the rotor/mast assembly. Investigators examined the flight profile and the physical evidence at the crash site, noting that the location of the main rotor debris suggested the separation occurred at a low altitude.
Technicians and investigators also reviewed the pilot's use of safety equipment and the aircraft's configuration. The investigation noted that the pilot was an experienced professional, proficient in vertical-reference and slung-load operations. However, the inquiry also looked into the lack of an underwater locator beacon, which delayed the recovery of the wreckage, and the limitations of existing safety harnesses and survival equipment regulations for over-water operations.
Findings
- The helicopter descended to an altitude that allowed the slung load to strike the water surface.
- Drag forces from the load/water contact caused the loss of the hook assembly and the disruption of flight controls.
- The sudden impact and subsequent mechanical failures led to mast bumping and main-rotor separation.
- The pilot did not wear a shoulder harness or life jacket because the required equipment interfered with the ability to perform vertical-reference flying.
- The aircraft was not equipped with an underwater locator beacon, which hindered the timely recovery of the wreckage.