No fatalities

Helicopter Engine Failure Leads to Forced Landing and Skid Collapse (N86198)

Seattle, WA, US

On August 18, 1993, an Enstrom F-28C (registration N86198) was involved in an aviation accident near Seattle, WA. No fatalities were reported. Investigators recorded the probable cause as: One magneto condenser shorted-out by arcing over its insulator base, and the second condenser shorted-out where the lead wire was exposed through its insulation. 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 helicopter experienced a complete loss of power at 800 feet AGL. The pilot performed an autorotation to a confined grassy area, maneuvering to avoid a person. The aircraft touched down, bounced, and suffered a skid collapse on the second touchdown. Inspection revealed two shorting magneto condensers.

Loss of Power

While en route at approximately 800 feet above ground level, the helicopter suffered a complete loss of engine power. The exact circumstances leading to the power loss were not immediately apparent, but the pilot initiated an emergency procedure.

Autorotation and Landing

The pilot executed an autorotation to a confined grassy area. During the descent, just prior to touchdown, the pilot had to maneuver the aircraft to avoid a person who was in the area of the intended landing spot. The helicopter touched down, bounced, and then experienced a skid collapse when it touched down a second time. The sequence of events following the power loss resulted in damage to the landing gear.

Inspection Findings

Following the incident, an inspection of the engine components was conducted. The examination revealed that one magneto condenser was shorting-out by arcing over its insulator base. Additionally, the second condenser was shorting-out where the lead wire was exposed through its insulation. These findings indicate the condition of the ignition system components at the time of the power loss.

Probable cause

One magneto condenser shorted-out by arcing over its insulator base, and the second condenser shorted-out where the lead wire was exposed through its insulation.

Frequently asked questions

What happened in the 18 Aug 1993 Enstrom F-28C accident near Seattle, WA?

A helicopter experienced a complete loss of power at 800 feet AGL. The pilot performed an autorotation to a confined grassy area, maneuvering to avoid a person. The aircraft touched down, bounced, and suffered a skid collapse on the second touchdown. Inspection revealed two shorting magneto condensers.

Were there any fatalities in the 18 Aug 1993 Enstrom F-28C accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 18 Aug 1993 involved an Enstrom F-28C, registration N86198, at Seattle, WA.

What was the probable cause of the accident?

One magneto condenser shorted-out by arcing over its insulator base, and the second condenser shorted-out where the lead wire was exposed through its insulation.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001211X13256. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.