Casualties unknown

Pilot Wipes Dew from Helicopter Bubble, Strikes Wires During Departure (N1309X)

Sonoma, CA, US

On February 20, 1995, a Bell 47G-5 (registration N1309X) operated by North Coast Helicopter Service was involved in an aviation accident near Sonoma, CA. Investigators recorded the probable cause as: the pilot's failure to maintain an adequate visual lookout for obstructions during initial climb. Factors which contributed to the accident were the pilot's inadequate preflight inspection, and his decision to fly with an inadequately cleaned bubble which… This summary draws on records from the U.S. National Transportation Safety Board (NTSB) historical archive.

Sourcesthe U.S. National Transportation Safety Board (NTSB) historical archivePrimary reportUpdated 2026-07-04Data APIEditorial standards

A pilot reported that during preflight, he wiped dew from the helicopter bubble with his hands. Distracted by approaching bystanders, he took off and flew into telephone wires, with sun glare further restricting visibility.

Incident Overview

A helicopter pilot encountered restricted visibility during a preflight inspection due to moisture (dew) accumulated on the aircraft's bubble. Lacking towels, the pilot attempted to clear the bubble by wiping it with his hands.

Departure and Obstacle Strike

As the pilot prepared to depart, he observed bystanders approaching the aircraft. To avoid them, he initiated a takeoff in a direction away from their position. During the departure, the helicopter flew into telephone wires. The pilot also noted that the sun was positioned directly in front of him, further limiting his ability to see the wires.

Contributing Factors

While the pilot's report does not assign specific causes, the sequence of events highlights the challenges of preflight preparation, environmental conditions, and decision-making during takeoff. The presence of moisture on the bubble, the lack of appropriate cleaning materials, and the need to maneuver away from bystanders combined with sun glare created a situation where the pilot inadvertently struck the wires.

Frequently asked questions

What happened in the 20 Feb 1995 Bell 47G-5 accident near Sonoma, CA?

A pilot reported that during preflight, he wiped dew from the helicopter bubble with his hands. Distracted by approaching bystanders, he took off and flew into telephone wires, with sun glare further restricting visibility.

What aircraft was involved and where did it happen?

The accident on 20 Feb 1995 involved a Bell 47G-5, registration N1309X, operated by North Coast Helicopter Service, at Sonoma, CA.

What was the probable cause of the accident?

the pilot's failure to maintain an adequate visual lookout for obstructions during initial climb. Factors which contributed to the accident were the pilot's inadequate preflight inspection, and his decision to fly with an inadequately cleaned bubble which partially obstructed his vision. Sun glare was an additional…

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001207X02997. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.