# Accident 20100811042329A: Grumman Acf G-164B, Tracy, CA, August 11, 2010

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: August 11, 2010, 07:13 local time
- Place: Tracy, CA
- Damage: Substantial damage
- Phase of flight: Takeoff: Climb Out
- Operating rules: Agricultural (Part 137)
- Operator: MBNG
- Location: 37.7572° N, 121.3308° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=37.7572&lon=-121.3308&mi=10
- Aircraft: N6781K, a cancelled registration (https://openairdocs.org/deregistered/N6781K-2022-07-02) (OpenAirDocs)
- Registry model: Grumman Acft ENG Cor-Schweizer G-164B (registry code 3952802, https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164b) (OpenAirDocs)
- Registry engine: Pratt & Whitney R1340 series (registry code 52016, https://openairdocs.org/engine/pratt-whitney-r1340-series) (OpenAirDocs)
- Reported make and model: GRUMMAN ACF G-164B
- Reported engine: P&W R1340 MODIFIED
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot
- Pilot flight hours: 3,280 total, 2,200 in this make and model, 200 in the last 90 days
- NTSB investigation: [NTSB WPR10LA396](https://openairdocs.org/ntsb/WPR10LA396) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20100811042329A

## Narrative

As the FAA filed it, in capitals; the FAA replaces private details with ^PRIVACY DATA OMITTED^.

PILOT HAD DEPARTED THEIR PRIVATE AIRSTRIP FOR HIS SECOND APPLICATION FLIGHT OF THE DAY. SHORTLY AFTER TAKEOFF AT APROX 200 FEET AGL PILOT HEARD A LOUD "BANG" FROM THE ENGINE FOLLOWED BY A VIOLENT AND CONTINUOUS SHAKING OF THE ENGINE. AT THIS POINT THE ENGINE WAS NO LONGER DEVELOPING POWER SO THE PILOT DUMPED THE LOAD (250 GALLONS) TO REDUCE WEIGHT IN PREPARATION FOR A FORCED LANDING. PILOT LANDED IN A THREE POINT ATTITUDE IN A GRASS PASTURE BUT WAS UNABLE TO STOP THE AIRCRAFT BEFORE STRIKING AN EARTHEN DITCH WHICH CAUSED THE AIRCRAFT TO PITCH OVER ITS NOSE COMING TO REST INVERTED.

## The NTSB's investigation of this event (1)

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

- [NTSB WPR10LA396](https://openairdocs.org/ntsb/WPR10LA396), Aug 11, 2010: Grumman G164 (N6781K), Tracy, CA, substantial damage. Probable cause: A total loss of engine power while maneuvering due to an internal catastrophic failure to the master rod and piston connecting rod links.

## Other reports on N6781K (2)

Matched to the same aircraft by N-number and date.

- [Accident 20160702013599A](https://openairdocs.org/incident/20160702013599A), Jul 2, 2016: Grumman Acft Eng Cor-Schweizer G-164B (N6781K), Laurel, DE, Substantial damage. At the finish of the last pass of spraying a field in sussex county Delaware, pilot reports hearing a loud bang followed by loss of engine power. Aircraft was…
- [Incident 19880518037929I](https://openairdocs.org/incident/19880518037929I), May 18, 1988: Scwzer G164B (N6781K), Morganza, LA, Substantial damage. Struck a levee during a swath run and landed minus the gear. Blamed dirty windshield and blind by morning sun.

From the FAA Accident/Incident Data System. Reports are matched to registry aircraft by N-number and event date, checked against the reported make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model. For accidents, the NTSB's own investigation is the fuller record.

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