Casualties unknown

Improper Fabric Installation Leads to Loss of Control (N99636)

Oklahoma City, OK, US

On December 21, 1988, an Ercoupe (eng & Research Corp.) 415C (registration N99636) operated by Kautz, James P. was involved in an aviation accident near Oklahoma City, OK. Investigators recorded the probable cause as: Improperly installed wing fabric that detached in flight, leading to a loss of control. 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 2026-06-22Data APIEditorial standards

An aircraft entered a steep banked spiral during flight due to improperly installed wing fabric that detached, resulting in a crash into a garage and the ground.

What happened

During the course of flight, the airplane appeared to enter a steep banked spiral from which it did not recover. The aircraft subsequently struck a two-car detached garage before impacting the ground.

The investigation

A post-accident inspection revealed that the fabric on both wings had been installed improperly. Additionally, part of the fabric on the left wing had come loose during flight.

Findings

The improper installation of the wing fabric contributed to the loss of control.

Probable cause

Improperly installed wing fabric that detached in flight, leading to a loss of control.

Frequently asked questions

What happened in the 21 Dec 1988 Ercoupe (eng & Research Corp.) 415C accident near Oklahoma City, OK?

An aircraft entered a steep banked spiral during flight due to improperly installed wing fabric that detached, resulting in a crash into a garage and the ground.

What aircraft was involved and where did it happen?

The accident on 21 Dec 1988 involved an Ercoupe (eng & Research Corp.) 415C, registration N99636, operated by Kautz, James P., at Oklahoma City, OK.

What was the probable cause of the accident?

Improperly installed wing fabric that detached in flight, leading to a loss of control.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001213X27420. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.