Grumman G-164B N6774Q

Summary

On 11 August 2001 at about 14:20 local time, a Grumman G-164B registered N6774Q was involved in an accident near Quincy, Washington, United States. One person was on board and nobody was injured. The aircraft was substantially damaged. The NTSB has published a probable cause for this accident; it is quoted in full below.

Date

11 August 2001 at 14:20

Classification

Accident

Location

Quincy, Washington, United States

Coordinates

47.1708, -119.7991

Aircraft

Grumman G-164B

Registration

N6774Q

Category

Airplane

Engines

1

Operator

Not recorded

Operating rule

Part 137: Agricultural

Purpose of flight

Aerial Application

Phase of flight

Not recorded

Route

Quincy → Unknown

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

SEA01LA149

Nobody was injured.

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

Quoted verbatim from the NTSB record. This site does not paraphrase or interpret it.

Read the full NTSB narrative

Just as the "Agcat" spray plane broke ground, the engine bogged down and an oil spray appeared on the windscreen. The pilot dumped the chemical load and continued straight ahead executing a forced landing in an agricultural field during which the aircraft nosed over. Post-accident examination of the engine revealed substantial metal in the oil filter and on the magnetic sump chip detector. Further examination revealed substantial rubbing and abrasion damage to the engine impeller. The impeller and associated collector case were examined by the Engineering Branch Laboratory of the Canadian Transportation Safety Board. The examination of the impeller and case revealed no signs of any progressive failure mechanism and the degree of damage was to such an extent as to prevent a conclusive determination of the initiating event.

Quoted verbatim from the NTSB record.