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.