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Thu, May 12, 2011

NTSB Names Pilot Error As Cause Of Florida EMS Helo Accident

Fortunately, All Three Aboard The Helicopter Survived

The NTSB has determined that pilot error caused an Emergency Medical Services helicopter to go down in the Gulf of Mexico near Captiva Island on August 17th, 2009. The good news is, all three people who were on board at the time of the accident were able to exit the aircraft and survived. In this case, a cockpit distraction resulted in "controlled flight into terrain."

NTSB Identification: ERA09LA464
14 CFR Part 91: General Aviation
Accident occurred Monday, August 17, 2009 in North Captiva Island, FL
Probable Cause Approval Date: 04/28/2011
Aircraft: EUROCOPTER DEUTSCHLAND GMBH EC-145, registration: N911LZ
Injuries: 3 Uninjured.

The emergency medical services (EMS) helicopter was on a night, over-water flight in visual meteorological conditions when the accident occurred. The pilot and two medical crewmembers were en route to pick up a patient on a barrier island. The pilot flew over the water with the autopilot engaged (altitude acquisition mode), at an altitude of 1,000 feet. While en route, the pilot unsuccessfully attempted to contact the fire department on the island to obtain landing zone information. When the helicopter was approximately 3 minutes from landing, the pilot selected 500 feet using the autopilot and the helicopter initiated a descent to that altitude. Unable to contact the fire department, the pilot likely became preoccupied with the task as well as the visual acquisition of the landing. The descent-power setting, which was manually controlled by the pilot, was not adequate to capture the selected altitude, and maintain 60 knots. As designed, the helicopter likely continued its descent with the autopilot engaged until it impacted the water. The pilot observed an amber indication on the primary flight display just before impact, which indicated the autopilot was engaged, and confirmed this most likely scenario.

A post-accident examination of the helicopter revealed no pre-impact mechanical anomalies. After the impact, the dispatcher initiated a re-boot of her computer, rather than a search for the helicopter, when the helicopter's movement stopped on her screen. However, the fire department on scene initiated a search, and the crewmembers were rescued within a short timeframe. Had the crewmembers sustained serious injuries during the accident, the dispatcher's failure to initiate a search may have reduced the survivability of the accident.

The National Transportation Safety Board determines the probable cause(s) of this accident to be the pilot's failure to arrest the helicopter's descent, which resulted in controlled flight into terrain.

FMI: www.ntsb.gov

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