A new report says a leaking O-ring is the reason the pilots of a Sea King helicopter were forced to make a controlled emergency landing last year.

The helicopter landed near a parking lot at a Sobeys in Bedford on Nov. 22, 2012.

Military safety officers say the faulty, dime-sized seal was leaking hydraulic fluid.

Their report says it was the fifth time since 2000 that an O-ring or the packing material beneath it has broken down and started to leak.

Lt.–Col. Jeff Fletcher, the commanding officer of 423 Squadron, said last November that the Sea King helicopter dispatched from CFB Shearwater was returning from a routine training mission to Greenwood when the indicator light showed a problem with the helicopter's hydraulics.

No one was injured in the incident.

With files from The Canadian Press