# Accident 20100423032969A: Grumman Acf G-164A, Madera, CA, April 23, 2010

- Type: FAA accident report (Accident/Incident Data System), as reported
- Date: April 23, 2010, 13:30 local time
- Place: Madera, CA
- Damage: Substantial damage
- Phase of flight: Cruise/Level Flight
- Operating rules: General operating rules (Part 91)
- Location: 36.9886° N, 120.1122° W: From the FAA
- Nearby events: https://openairdocs.org/map.md?lat=36.9886&lon=-120.1122&mi=10
- Aircraft: N4450, registered now (https://openairdocs.org/aircraft/N4450) (OpenAirDocs)
- Registry model: Grumman Acft ENG Cor-Schweizer G-164A (registry code 3952801, https://openairdocs.org/model/grumman-acft-eng-cor-schweizer-g-164a) (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-164A
- Reported engine: P&W P&W PT6A
- People aboard: 1
- Fatal injuries: 0
- Other injuries: 0
- Pilot certificates: Commercial pilot
- Pilot flight hours: 10,000 total, 500 in this make and model, 40 in the last 90 days
- NTSB investigation: [NTSB WPR10LA214](https://openairdocs.org/ntsb/WPR10LA214) (OpenAirDocs)
- FAA source: FAA Aviation Safety Information Portal (https://asip.faa.gov/)
- Page: https://openairdocs.org/incident/20100423032969A

## Narrative

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

THE AIRCRAFT WAS BEING FERRIED UNDER FAR PART 91 WHEN APPARENTLY LOST ENGINE POWER WHILE AT 1500 FEET AGL AT CRUISE ALTITUDE. AN EMERGENCY LANDING WAS INITIATED AND LANDED IN A PISTACHIO ORCHARD CAUSING SUBSTANTIAL DAMAGE TO THE AIRCRAFT'S WING SPARS, PROPELLER AND ENGINE COMPONENTS.  THERE APPEARS TO HAVE BEEN A LOSS OF OIL PRESSURE BY THE EVIDENCE OF OIL FOUND AROUND THE ENGINE COMPARTMENT.  THE PROPELLERS SUSTAINED DAMAGED TO TWO OF THE THREE PROPELLERS AND ALL PROPELLERS WERE FOUND IN A "FEATHERED" POSITION.  THIS CONDITION INDICATES A LOSS OF OIL PRESSURE.  THE ENGINE WAS INSPECTED INTERNALLY BY A REPRESENTATIVE OF PRATT & WHITNEY AND FOUND NO OBVIOUS REASONS FOR THE LOSS OF ENGINE POWER OR OIL PRESSURE.  ONE IGNITOR HAD EVIDENCE OF A SOOTY OIL BUILD-UP.  THE FUEL SELECTOR VALVE APPEARED TO HAVE DIFFICULTY IN MOVING THE FROM OFF TO ON.

## 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 WPR10LA214](https://openairdocs.org/ntsb/WPR10LA214), Apr 23, 2010: Grumman Acft ENG Cor-Schweizer G-164A (N4450), Madera, CA, substantial damage. Probable cause: A loss of engine power for undetermined reasons.

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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