NTSB Identification: CEN10IA372
Nonscheduled 14 CFR Part 135: Air Taxi & Commuter
Incident occurred Sunday, July 04, 2010 in Dayton, OH
Probable Cause Approval Date: 04/07/2011
Aircraft: EUROCOPTER AS365N3, registration: N520CF
Injuries: 3 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

The emergency medical services transport helicopter sustained minor damage when a door window separated in-flight. The pilot dropped a flight manual during cruise flight that impacted the right center door jettison handle, allowing the window to separate and impact the horizontal stabilizer. The required jettison handle guard was not installed. The helicopter’s maintenance manual directs that the crew and passenger doors be checked every 600 hours of flight time or every two years. The manual requires the following steps to reinstall the doors, "Install the Plexiglas protective cover." Subsequent to the accident, the helicopter manufacturer issued Safety Information Notices which described the incident and reminded mechanics that while performing routine maintenance procedures, in particular assembly procedures, “it is important to strictly comply with all applicable maintenance procedures, including the most basic and simple ones, to ensure proper helicopter performance and flight safety.”

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

The unintentional movement of the jettison handle in-flight due to the pilot’s dropping of a manual that impacted the handle and released the door window, which then impacted the horizontal stabilizer. Contributing to the accident was the jettison handle guard not being installed by maintenance personnel.

Full narrative available

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