In 2006, there was an accident involving a helicopter called Mercy Air. The helicopter was flying in the sky and carrying some people who needed medical help. But something went wrong and the helicopter crashed, which means it fell down very fast and hit the ground.
The accident happened because the pilot of the helicopter couldn't see where he was going. You know how when you're in the car and it's really foggy outside, and you can't see very well? Well, it was like that for the pilot. He couldn't see very well because of the clouds. They were really low and thick, so he made a mistake and didn't fly the helicopter the right way.
Because of the crash, some people on the helicopter were hurt really badly and some even died. This was really sad for their families and friends. When something like this happens, people want to find out how to stop it from happening again in the future. So the people who investigate accidents (like detectives but for accidents instead of crimes) looked into what happened.
They found out that there were some things that could have been done better to keep everyone safe. For example, they said the helicopter should have had some special equipment to help the pilot see better in bad weather. Also, they said the crew on the helicopter should have made sure they knew exactly where they were flying and how they were going to land.
After the accident, people worked hard to improve safety for helicopter flights, so that accidents like this one won't happen again. They made new rules and guidelines to make sure that everyone involved in flying knows what to do to stay safe.