Casualties unknown

Tow Plane and Glider Collide with Trees After Power Loss During Takeoff (N5506S)

Easton, WA, US

On August 14, 1986, a Cessna 188 (registration N5506S) was involved in an aviation accident near Easton, WA. Investigators recorded the probable cause as: A one-inch piece of Teflon tape blocking the intake side of the fuel pump. 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 2026-06-10Data APIEditorial standards
Aircraft registered N5506S
Aircraft registered N5506S. Photo: Bill Larkins / CC BY-SA 2.0, via Wikimedia Commons

During takeoff, a tow plane lost power at about 50 feet AGL; after releasing the glider, both aircraft landed but collided with trees. Investigation found Teflon tape blocking the fuel pump.

Accident Sequence

A tow plane, while towing a glider, experienced a loss of engine power during takeoff. The power loss occurred at about 50 feet above ground level. In response, the tow pilot signaled the glider pilot to release the tow line. After the release, both pilots executed landings on the remaining runway. The tow plane, after landing, skidded off the end of the runway and into trees. Simultaneously, the glider, while attempting to land, also collided with trees.

Investigative Findings

Following the accident, an investigation was conducted. It was determined that a one-inch piece of Teflon tape was obstructing the intake side of the fuel pump.

Probable cause

A one-inch piece of Teflon tape blocking the intake side of the fuel pump.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X34637. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.