Grumman Acft Eng Cor-Schweizer G-164B N8422K

Summary

On 19 July 2021 at about 19:10 local time, a Grumman Acft Eng Cor-Schweizer G-164B registered N8422K, operated by Thompson Aero Inc, was involved in an accident near Amana, Iowa, 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

19 July 2021 at 19:10

Classification

Accident

Location

Amana, Iowa, United States

Nearest airport

Amana (C11)

Coordinates

41.7947, -91.8650

Aircraft

Grumman Acft Eng Cor-Schweizer G-164B

Registration

N8422K

Category

Airplane

Year built

1976

Engines

1

Operator

Thompson Aero Inc

Operating rule

Part 137: Agricultural

Purpose of flight

Aerial Application

Phase of flight

Not recorded

Aircraft damage

Substantial

Weather

VMC

Light

Day

NTSB number

CEN21LA329

Nobody was injured.

The loss of engine power for reasons that could not be determined.

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

Read the full NTSB narrative

The pilot of the agricultural airplane reported that the airplane’s engine lost power shortly after takeoff. The airplane settled into the corn field off the departure end of the runway and nosed over. The airplane sustained substantial damage to its left wing and fuselage. All three propeller blades exhibited aft bending, bending opposite rotation, twisting toward low pitch and chordwise/rotational scoring predominately on the camber side which was consistent with impact at low power. Examination of the engine revealed a discontinuity in the drive system consisting of a broken torsion shaft. The broken torsion shaft is indicative of the engine operating at the time of impact. Examination of the fuel control unit and the propeller governor did not reveal any anomalies. No anomalies were found with respect to the engine, propeller, fuel control unit, or propeller governor that would explain the reported loss of engine power. Based on the results of testing and examination, the reason for the reported loss of engine power could not be determined.

Quoted verbatim from the NTSB record.