Friday, July 28, 2017

Cessna 170A, N5596C: Accident occurred July 27, 2017 at Calaveras County Airport (KCPU), San Andreas, California

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

NTSB Identification: GAA17CA445 
14 CFR Part 91: General Aviation
Accident occurred Thursday, July 27, 2017 in San Andreas, CA
Probable Cause Approval Date: 11/14/2017
Aircraft: CESSNA 170, registration: N5596C
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot of the tailwheel-equipped airplane reported that he landed on the main wheels, and while waiting for the tailwheel to drop, the “tailwheel jammed.” He added that, when the tailwheel touched down, the airplane was difficult to control and veered to the left. He corrected for the veer, but the airplane veered to the right. He then conducted a go-around; however, once airborne, the airplane “did not appear to be producing proper power.” He then aborted the go-around and opted to land on the remaining runway. About 25 ft above the runway, he set the airplane up for a wheel landing and descended. When the airplane was about 5 to 10 ft above the runway, the airplane “abruptly” sank and landed hard, and the main landing gear collapsed. Subsequently, the airplane came to rest nose down on the runway.

The airplane sustained substantial damage to the fuselage.

During a telephone interview, the pilot reported that he believed the tailwheel had jammed before touchdown and that he had previously redesigned and altered the tailwheel. Further, the airplane produced insufficient power during the go-around. He reported that the tailwheel was mechanically “okay” when examined after the accident.

Additionally, an airframe and powerplants mechanic reported that he examined the tailwheel assembly after the accident and found no defects and no binding.

The pilot reported that the weather at the accident airport, about the time of the accident, was wind from 320° at 10 knots, gusting to 12 knots. The pilot landed on runway 31.

Photographs taken at the accident site showed torsional twisting of the propeller, consistent with the engine producing power at the time of impact. The National Transportation Safety Board did not examine the engine.

The National Transportation Safety Board determines the probable cause(s) of this accident as follows:
The pilot’s improper landing flare during an aborted go-around in gusting wind conditions, which resulted in a hard landing.

Federal Aviation Administration / Flight Standards District Office; Sacramento, California

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

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

http://registry.faa.gov/N5596C

NTSB Identification: GAA17CA445
14 CFR Part 91: General Aviation
Accident occurred Thursday, July 27, 2017 in San Andreas, CA
Aircraft: CESSNA 170, registration: N5596C
Injuries: 1 Uninjured.

NTSB investigators used data provided by various entities, including, but not limited to, the Federal Aviation Administration and/or the operator and did not travel in support of this investigation to prepare this aircraft accident report.

The pilot of the tailwheel-equipped airplane reported that, he landed on the main wheels, and while waiting for the tailwheel to drop, the "tailwheel jammed." He added, that when the tailwheel touched down, the airplane was difficult to control, and veered to the left. He corrected for the veer, but the airplane veered to the right. He then did a go-around, however, once airborne the airplane "did not appear to be producing proper power." He then aborted the go-around, and opted to land on the remaining runway. About 25 ft. above the runway, he set the airplane up for a wheel landing and descended. When the airplane was about 5-10 ft. above the runway, the airplane "abruptly" sank, landed hard and collapsed the main landing gear. Subsequently, the airplane came to rest nose down on the runway.

The airplane sustained substantial damage to the fuselage.

During a telephone interview, the pilot reported that he believed the tailwheel had jammed prior to touchdown, and that he had previously re-designed and altered the tailwheel. Further, the airplane produced insufficient power during the go-around. He reported that, the tailwheel was mechanically "okay" when inspected after the accident.

Additionally, an airframe and powerplant mechanic reported that he inspected the tailwheel assembly after the accident, and found no defects and no binding.

The pilot reported the weather at the accident airport, about the time of the accident to be, wind from 320° at 10 knots, gusting to 12 knots. The pilot landed on runway 31.

Photographs taken at the accident site showed torsional twisting of the propeller, consistent with the engine producing power at the time of impact. The National Transportation Safety Board did not examine the engine.

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