Three Pinal County Sheriff's Office employees escaped injury after the helicopter they were in made an emergency landing after losing power.
Sheriff's spokeswoman Tamra Ingersoll says the helicopter landed safely around 7 a.m. Tuesday just north of Interstate 8.
She says the sheriff's office Raven 1 helicopter was on a routine maintenance flight operation when the pilot began having engine problems.
The pilot was able to make an emergency landing on a dirt field, missing nearby high-tension power lines.
Ingersoll says a tactical flight officer and another aviation unit deputy also were aboard the helicopter.
She says all three men received precautionary medical evaluations at a nearby medical facility.
The Federal Aviation Administration and the National Transportation Safety Board are investigating the incident.
The Associated Press contributed to this report.
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