Casualties unknown

Engine Failure After Fuel Strainer Safety Wire Missing Leads to Forced Landing (N3663S)

Grundy Center, IA, US

On May 31, 1991, a Cessna 172E (registration N3663S) operated by Robert Willett was involved in an aviation accident near Grundy Center, IA. Investigators recorded the probable cause as: FAILURE BY OTHER MAINTENANCE PERSONNEL TO INSTALL A SAFETY WIRE AND FUEL EXHAUSTION. 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 single-engine airplane lost engine power after the fuel strainer bowl was found without safety wire, causing fuel stains along the fuselage. The pilot landed in a farm field.

Incident Overview

Approximately 30 minutes after takeoff on a cross-country flight, the pilot of a single-engine airplane reported that the engine began sputtering. He promptly contacted an approach control facility and received guidance to the nearest airfield. However, before reaching the airfield, the engine lost all power, forcing the pilot to execute a landing in a farm field.

Wreckage Examination

Post-accident examination of the wreckage revealed fuel stains along the lower fuselage, extending from the firewall aft. The stains originated at the fuel strainer. Upon inspection, the strainer bowl was found to have no safety wire installed.

Conclusion

The investigation documented the absence of safety wire on the fuel strainer bowl and the resulting fuel leakage. No other contributing factors were identified in the source material.

Frequently asked questions

What happened in the 31 May 1991 Cessna 172E accident near Grundy Center, IA?

A single-engine airplane lost engine power after the fuel strainer bowl was found without safety wire, causing fuel stains along the fuselage. The pilot landed in a farm field.

What aircraft was involved and where did it happen?

The accident on 31 May 1991 involved a Cessna 172E, registration N3663S, operated by Robert Willett, at Grundy Center, IA.

What was the probable cause of the accident?

FAILURE BY OTHER MAINTENANCE PERSONNEL TO INSTALL A SAFETY WIRE AND FUEL EXHAUSTION.

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20001212X16970. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.