(Corrects "casual" to "causal" in 8th par)
LONDON Oct 21 The crew of a helicopter that
crashed in the North Sea near Scotland's Shetland Islands did
not notice the aircraft had been slowing until it was too late,
a British air safety investigation team said.
Four oil rig contractors were killed when a Super Puma L2,
made by EADS's Eurocopter subsidiary, crashed into the
sea off Shetland's rocky southern coast on Aug. 23.
The helicopter, carrying 16 passengers and two crew, was
operated by CHC Helicopter for France's Total
and was heading to Sumburgh airport in Shetland.
In a report published on Friday, the Air Accident
Investigation Branch (AAIB) said the aircraft had reduced its
airspeed during its descent with the intention to maintain it at
a certain level, but the helicopter had continued to lose speed,
which went "unobserved by the crew".
"At some point the commander saw the sea, but he was unable
to arrest the helicopter's descent and it struck the surface
shortly thereafter," the report said.
CHC said that its pilot training followed strict regulations
and industry standards and the airmen involved in the accident
were well-trained and experienced, adding that it would not
speculate on outcomes until the investigation was complete.
"The bulletin tells us what happened but not yet why it
happened. We all want to understand why this happened and this
will be a significant part of the ongoing investigation," CHC's
Vice President of Safety and Quality, Duncan Trapp, said.
The AAIB repeated that it had found no evidence of a causal
technical failure, a statement it first made on Sept. 5, and
said the continuing investigation would focus on the operational
aspects of the flight.
The crash was the fifth accident in four years in the area
involving different models of Super Pumas, including a fatal
crash of an L2 in April 2009 in which 16 people were killed.
(Reporting by Brenda Goh; Editing by David Goodman)