McALESTER, Okla. — The pilot of a medical transport helicopter that crashed near Eufaula Thursday night encountered a lowering cloud ceiling and was attempting to turn the aircraft when the fatal crash happened, according to a federal official.

National Transportation Safety Board Investigator Tom Latson and a team of experts are investigating the deadly crash of an EagleMed air ambulance helicopter in rugged, remote terrain west of Eufaula. The pilot, Matt Mathews, was killed. Two crew members, Kim Ramsey and Paramedic Ryan Setzkorn, survived.

Latson said the crew had just transported a McAlester teen who had been critically injured in a vehicle accident to St. Francis Health System in Tulsa and was on a return flight back to the McAlester Regional Airport at the time of the 11:25 p.m. crash.

"While enroute (back to McAlester), the helicopter encountered lowering clouds, and the pilot had made the decision to return to Tulsa because of the lowering clouds," Latson said. "The lowering ceiling, (the clouds were) going from high to low."

The helicopter crashed during what Latson described as a left turn.

"During their left turn to return to Tulsa, they impacted trees and rocky terrain due eastbound," Latson said. "The wreckage distribution was from west to east.

"The helicopter was technically destroyed by the impact," Latson said. "The rotor blades impacted trees, the fuselage impacted trees. The tail boom was separated from the aircraft and found less than 100 feet from the main wreckage. The front-end of the helicopter was separated from the main fuselage.”

Latson said the main fuselage came to rest on its side.

"One of the crew members on board used a cell phone to notify his home base of his location and extracted the other person from the wreckage,” Latson said. “They waited for rescuers."

Latson said a thorough investigation will seek to identify a cause of the crash. When asked if the lowering cloud cover encountered by the pilot played a role in the crash, Latson said it was not his job to offer an opinion on what caused the crash but instead to discern as many facts as possible about the tragedy. Those facts will then be forwarded to the National Transportation Safety Board for a full review.

"The main reason we do an exceptionally thorough and sometimes painfully long investigation is to determine the facts of the accident and make recommendations," Latson said.

On the night in question, a storm front that brought an exceptional amount of rain to southeast Oklahoma on Friday was slowly moving into the area. However, an informal check of Oklahoma Mesonet weather observations performed by the News-Capital shows in the Eufaula area there was zero rain and maximum wind gusts readings of only 11 miles per hour around the time of the crash. The temperature was in the 50s.

"Our NTSB meteorology specialist is also doing a complete meteorology study of weather conditions as they existed before and during the time of the accident," Latson told the newspaper. "And we have an NTSB air traffic control specialist (to analyze) FAA air traffic control data and radar data."

A spokesman for EagleMed declined to comment on this story, citing the ongoing investigation.

Latson said Mathews did do a diligent review of weather conditions that evening.

“There is evidence that the pilot did a thorough weather check before departure from McAlester and before departure from St. Francis,” Latson said. “They also have on board...access to graphical radar such as graphical radar reports. They don't have access to radar but they do have through an onboard computer the ability to look at it.”

Latson said an inspection of the aircraft will include an examination of the aircraft’s engine along with a search for any equipment that would record flight data.

The crash is the fourth for EagleMed in Oklahoma in recent years and the second fatal flight of an EagleMed helicopter based out of McAlester. On June 11, 2013, an EagleMed chopper based at MRHC crashed shortly after takeoff from the Choctaw National Indian Health Care Center in Talihina. A patient picked up at the facility died in the crash.

“This is one of the moderately-large air ambulance companies,” Latson said. “The employees in the McAlester area are very proud of ...the job they do for the public. The coworkers of the people injured and killed are emotionally devastated, and the assistance and understanding of your readers is needed.”

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Puit and Dishman write for McAlester News Capital, a CNHI News Service publication.

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