Broken gears inside ulykkeshelikopterets gearbox and a support rod that apparently are broken across, is among the wreckage Accident Investigation Board will investigate.
– this should not be seen as the source or cause of the accident. We have throughout the period sought in the sea to find the parts that we are missing and we are still missing important parts, says Department of Aviation Kåre Halvorsen Accident Investigation Board.
18 May starting new searches in the sea at the crash site on Turøy.
– We are looking specifically for a plate that holds gear in the gearbox. That is what we have the greatest hope of finding and it is important because it can provide a more complete picture of the extent of damage, says Halvorsen.
FINDINGS: The exploration area is divided into zones and crawled to land and water. Among other divers from the Navy and Bergen fire participated.
Graphics: Øyvind EnganIt is applied on land and in the sea since shortly after the accident. Portions are found over a wide area. Parts of the gear is found not far from where the main wreckage was hoisted up. Parts of the rotor blades is found several hundred meters from the crash site.
Complicated job
Yesterday set aviation experts in Havarkommisjonen in meetings with key partners, including both French- and English-speaking . Kåre Halvorsen describes the work as complicated and said that they are in the initial phase.
How long they will need before they can determine the cause of the dramatic helikopterstyrten two weeks ago, will not branch director speculate.
13 people died when a Super Puma helicopter crashed on its way from the Gullfaks B platform to Flesland Bergen.
– We have collected and sorted parts, but not progressed far enough we have started to dismantle some of what we found. Now some of the things we have found packed and sent to including manufacturer Airbus and the British and French AIBN. We send the parts there with our own employees, because the best tool and test equipment for this work exists in France and England, says Kåre Halvorsen.
Right now, the Commission has focused on examining the support braces, main gearbox and the rotor head on the helicopter, they write in the preliminary investigation report.
ON LAND AND SEA: These are parts that are found after the crash. Something is found on land. The parts that were recovered by divers marked already by rust.
Photo: Trond Solberg VGin 2009 overthrew an older variant of the Airbus-manufactured Super Puma helicopter in the sea off Scotland. Just like in the 2009 accident, it is now proven broken-called planetary in the upper part of ulykkeshelikopterets gearbox.
The time loosened rotor of the helicopter outside Peterhead in Scotland. 16 people lost their lives when the helicopter body crashed into the sea.
Over the major part of the main gearbox is that two teams of eight so-called planetary in each. The job of these make is to further reduce the speed of the motor up to the rotor. A crack in the ring which surrounds the planetary were later detected in the 2009 accident. It was then discovered that this fracture was caused by fatigue.
AIBN stated in its preliminary report they have found about half of the total of 16 planetary (gears) in accident helicopter. At least two of these were damaged or broken.
Jacks struts
Also three struts which are attached between the gearbox over and the helicopter’s body was shown in the interim report from the Accident Investigation Board.
the two rear was apparently undamaged. AIBN also displayed bolts and fasteners to these. Also they apparently undamaged out.
The AIBN also shows parts of the third and front support bar. The pictures show a jack top portion of the strut with a seemingly full bolt and a cotter pin.
Torn: Three strut connects the helicopter body and gearbox. The two rear struts are found throughout. Of the frontal, slightly thicker strut is only found a bolt, an “eye” to three bolt through and the upper part of the strut. Why this is broken across, is one of the issues they are working with.
Photo: AIBNSo far, neither Accident Investigation Board found evidence of so-called stress fractures.
Retired engineer Jan Erik Syljeset has worked with utmattingsproblematikk in former Kværner Brug, and later in Aker Solutions.
He has good knowledge of the mistakes that have previously caused fatal accidents, especially in the British sector of the North Sea with Super Puma helicopters.
– AIBN must finanalysere tensions on the eye that is broken. It is unfavorable designed. The factory must make a three-dimensional stress analysis. The same violations on both sides testify that violations are started from surface to bolt, said Syljeset.
The rotor of the accident helicopter by Turøy loosened not alone from the helicopter body. A portion of the fastening device for the gear and one of the rear support braces following too. It was found 3-400 meters from the crash site.
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