The Trauma One helicopter was responding to a three-vehicle crash on the I-95y, according to Action News Jax, but was unable to take off again.
The helicopter got 20 feet into the air, according to News4Jax, before the pilot realized there was a mechanical problem and landed again.
Police on the scene said they heard a humming sound coming from the helicopter and grounded it for three hours as a precaution.
Trauma One flight services manager Chad Mcintyre said later the humming was caused by a plastic bag entering the air intake system.
The two people extricated from the car crash were instead transported to the hospital by an ambulance, where they are in serious condition.
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