Norway H225 crash report recommends changes to Super Puma type design - Vertical Mag
EC225 Main Rotor Head and Main Gear Box Design - Aerossurance
Planetary bearing defect detection in a commercial helicopter main gearbox with vibration and acoustic emission - Faris Elasha, Matthew Greaves, David Mba, 2018
Norway: Was EC225 Gear Failure Detectable? - Rotor & Wing International
Eurocopter EC225 Super Puma - Wikipedia
EC225 crash near Bergen, Norway April 2016 - Page 9 - PPRuNe Forums
Accidents investigations hi-res stock photography and images - Alamy
A study on helicopter main gearbox planetary bearing fault diagnosis - ScienceDirect
Super Puma Epicyclic Gear Health Monitoring Background - Aerossurance
Eurocopter AS332 Super Puma - Wikipedia
Gearbox of 'copter which killed 13 men broken after falling from lorry before crash - Daily Record
Unexpected - Flight Safety Foundation
Puerto Rico Super Puma Overhauled
Aviation Investigation Report A09A0016 - Transportation Safety Board of Canada
Super Puma Second Stage Planet Gear Background - Aerossurance
Helicopter Main Gearbox Test Stand - YouTube
A study on helicopter main gearbox planetary bearing fault diagnosis - ScienceDirect
![EC225 crash near Bergen, Norway April 2016 [Archive] - Page 7 - PPRuNe Forums](http://www.aereo.jor.br/wp-content/uploads//2014/04/novo-projeto-do-eixo-do-EC225-EC725-recorte-2-a-partir-de-imagem-Airbus-Helicopters-c%C3%B3pia.jpg "EC225 crash near Bergen, Norway April 2016 [Archive] - Page 7 - PPRuNe Forums")
EC225 crash near Bergen, Norway April 2016 [Archive] - Page 7 - PPRuNe Forums
HavKar : How The Main Gearbox (MGB) Of A Helicopter Works
Unexpected - Flight Safety Foundation
Investigators Recommend Main Gearbox Changes in Wake of 2009 Super Puma Fatal Accident | Business Aviation News: Aviation International News
Report: Gearbox From Super Puma Accident In Norway Was Damaged In Road Accident | Aero-News Network
