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Agcat Spray Plane Noses Over During Forced Landing After Engine Failure (N6774Q)

Quincy, WA, US

On August 11, 2001, a Grumman G-164B (registration N6774Q) was involved in an aviation accident near Quincy, WA. Investigators recorded the probable cause as: The failure of the impeller assembly as a consequence of impeller rub and binding within the impeller collector case for undetermined reasons. 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

An Agcat spray plane experienced engine power loss and oil spray after takeoff. The pilot dumped the chemical load and executed a forced landing in a field, during which the aircraft nosed over. Post-accident engine examination revealed metal contamination and impeller damage.

Accident Summary

Just as the Agcat spray plane broke ground during takeoff, the engine experienced a power loss, with an oil spray appearing on the windscreen. The pilot reacted by dumping the chemical load and continuing straight ahead, performing a forced landing in an agricultural field. During the landing, the aircraft nosed over.

Investigation

The accident investigation included a post-accident examination of the engine. This examination revealed substantial metallic particles in the oil filter and on the magnetic sump chip detector. Further disassembly of the engine disclosed substantial rubbing and abrasion damage to the engine impeller. The impeller and its associated collector case were sent to the Engineering Branch Laboratory of the Canadian Transportation Safety Board for a detailed metallurgical analysis. The laboratory examination found no signs of any progressive failure mechanism; the degree of damage was so extensive that a conclusive determination of the initiating event could not be made.

Frequently asked questions

What happened in the 11 Aug 2001 Grumman G-164B accident near Quincy, WA?

An Agcat spray plane experienced engine power loss and oil spray after takeoff. The pilot dumped the chemical load and executed a forced landing in a field, during which the aircraft nosed over. Post-accident engine examination revealed metal contamination and impeller damage.

What aircraft was involved and where did it happen?

The accident on 11 Aug 2001 involved a Grumman G-164B, registration N6774Q, at Quincy, WA.

What was the probable cause of the accident?

The failure of the impeller assembly as a consequence of impeller rub and binding within the impeller collector case for undetermined reasons.

More accident analyses

Investigation report by the U.S. National Transportation Safety Board (NTSB) historical archive. Original record: https://carol.ntsb.gov/event/20010815X01693. This page is a structured re-presentation; facts and quotes are in the National Transportation Safety Board (NTSB), United States.