A spokesman for Idlewild and SoakZone amusement park near Ligonier (lihg-uh-NEER') says the boy was injured Thursday while riding the attraction with his brother.
A county dispatcher says the boy fell off the ride. But the park hasn't provided details on what happened.
Officials say the boy was conscious when he was airlifted to a hospital. The boy's name, age and condition haven't been released.
The Rollo Coaster opened in 1938 and takes riders up, down and around a wooded hillside. It doesn't require seat belts. It passed an inspection Saturday but will stay closed until an investigation ends.
On Sunday, a boy was decapitated riding a waterslide at a Kansas water park.
Gruesome details revealed in boy's water slide death at Kansas water park
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The Associated Press contributed to this report.