mandag 29. oktober 2012

EC225 - Ikke feilvarsel, men alvorlig design feil

Special Bulletin S6/2012 - EC225 LP Super Puma, G-CHCN

Date of occurrence: 22 October 2012
Summary:
The crew of the helicopter carried out a controlled ditching following indications of a failure of the main gearbox (MGB) lubrication system and, subsequently, a warning indicating failure of the emergency lubrication system. All passengers and crew evacuated the helicopter and were subsequently rescued without injury.
Click to read full details of this incident: http://tinyurl.com/8qjnt4x
Report name:
S6/2012 G-CHCN
Registration:
G-CHCN
Type:
EC225 LP Super Puma
Location:
In the North Sea, approximately 32 nm southwest of Sumburgh, Shetland Islands
Date of occurrence:
22 October 2012
Category:
Commercial Air Transport - Rotorcraft
Summary:
The crew of the helicopter carried out a controlled ditching following indications of a failure of the main gearbox (MGB) lubrication system and, subsequently, a warning indicating failure of the emergency lubrication system. All passengers and crew evacuated the helicopter and were subsequently rescued without injury.
 
Fra rapporten:
 
Preliminary engineering investigation
The main gearbox was drained. An initial visualexamination has identified a 360 degree circumferential crack on the bevel gear vertical shaft, in the vicinity of the weld that joins two sections of the shaft. Therefore, the main and standby oil pump gears were no longer being driven.

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