Wednesday, October 25, 2017

Schweizer G-164B, N8494K, owned and operated by Haley Flying Service Inc: Accident occurred October 24, 2017 in Tracy, San Joaquin County, California -and- Accident occurred February 23, 2010 in Byron, Contra Costa County, California

The National Transportation Safety Board did not travel to the scene of this accident.

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Oakland, California

Aviation Accident Preliminary Report - National Transportation Safety Board: https://app.ntsb.gov/pdf

Haley Flying Service Inc:  http://registry.faa.gov/N8494K

NTSB Identification: WPR18LA015
14 CFR Part 91: General Aviation
Accident occurred Tuesday, October 24, 2017 in Tracy, CA
Aircraft: SCHWEIZER AIRCRAFT CORP G 164B, registration: N8494K
Injuries: 1 Uninjured.

This is preliminary information, subject to change, and may contain errors. Any errors in this report will be corrected when the final report has been completed. NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

On October 24, 2017, about 1000 Pacific daylight time, a Schweizer Aircraft Corp G-164B, N8494K,was substantially damaged due to impact with terrain during the landing roll at a private airstrip near Tracy, California. The airplane was owned and operated by Haley Flying Service of Tracy. The commercial pilot, the sole occupant, was not injured. The familiarization flight was being operated in accordance with 14 Code of Federal Regulations Part 91, and a flight plan was not filed. Visual meteorological conditions prevailed at the time of the accident. The flight departed the private airstrip about 0900.

In a telephone interview with the National Transportation Safety Board (NTSB) investigator-in-charge shortly after the accident, the pilot said this was his first flight in the make and model of the accident airplane. The pilot stated that after making a smooth touchdown, during which he thought he had hit a bump on the runway, the airplane veered to the left. The pilot opined that he attempted to correct back to the right by using right rudder and then right brake, each of which was ineffective in stopping the airplane from veering further to the left. The airplane subsequently exited the left side of the runway and collided with a ditch, which resulted in the airplane spinning around to the left. A postaccident examination of the airplane revealed that both the upper and lower right wing panels had sustained substantial damage, and that the right main landing gear had collapsed. The pilot stated that while trying to correct back to the right, the right brake seemed "mushy". The airplane has been recovered and secured for further examination.

Aviation Accident Final Report - National Transportation Safety Board:  https://app.ntsb.gov/pdf

Investigation Docket - National Transportation Safety Board:  https://dms.ntsb.gov/pubdms

Aviation Accident Data Summary - National Transportation Safety Board: https://app.ntsb.gov/pdf

NTSB Identification: WPR10LA125
14 CFR Part 137: Agricultural
Accident occurred Tuesday, February 23, 2010 in Byron, CA
Probable Cause Approval Date: 07/18/2011
Aircraft: Schweizer Aircraft Corp G164B, registration: N8494K
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

After an aerial application flight, the pilot initiated a turn back toward the airstrip. The airplane's engine started to run rough and lose power. The pilot turned the airplane into the wind and initiated a forced landing into a deeply furrowed field. As the airplane touched down the landing gear sunk into the soft ground and the airplane nosed over, coming to a rest inverted. Postaccident examination of the airframe and an engine test run revealed no anomalies. The nearest weather reporting station reported a temperature of 9 degrees Celsius (C) and a dew point of 7 degrees C at the time of the accident. Review of the carburetor icing probability chart revealed that this temperature and dew point were conducive to serious icing at cruise power.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
A loss of engine power due to carburetor icing as a result of the pilot's failure to use carburetor heat.

On February 23, 2010, about 1330 Pacific standard time, a Schweizer Aircraft Corporation G-164B, N8494K, experienced a loss of engine power near Byron, California. Haley Flying Service, Inc., operated the airplane under the provisions of 14 Code of Federal Regulations Part 137 as an agricultural crop dusting operation. The airplane sustained substantial damage after making a forced landing on a soft dirt field and nosing over onto its back. The commercial pilot, the sole occupant, was not injured. Visual meteorological conditions were prevalent in the area, and no flight plan had been filed.

The pilot reported that after finishing the application flight he initiated a turn towards the airstrip when the engine started to run rough and lose significant power. The pilot turned the airplane into the wind and initiated a forced landing into a deeply furrowed field. As the airplane touched down, the landing gear sunk into the soft ground and the airplane nosed over, coming to rest inverted. 

Postaccident examination of the airframe and engine revealed substantial damage to three of the four airplane’s wings, along with the vertical stabilizer and rudder. No visual anomalies were observed with the engine. The spark plugs were removed and appeared normal. The fuel system was examined and found to be clear of water and debris. The engine was started and no anomalies were noted. 

The nearest weather reporting station was located at Livermore Municipal Airport, Livermore, California, about 12 nautical miles southwest of the accident site. At 1253 it reported, overcast skies at 400 feet; light rain showers; temperature 9 degrees Celsius (C); dew point 7 degrees C; and an altimeter setting of 30.19 inches of mercury. 

Review of the carburetor icing probability chart revealed that the temperature and dew point at the time of the accident were conducive to serious icing at cruise power.

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