Tuesday, July 26, 2016

STOL CH 750, N750AZ: Accident occurred July 24, 2016 near Greene County Airport (KWAY), Franklin Township, Pennsylvania

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


Analysis 

The flight instructor and student pilot were conducting a local instructional flight. Following uneventful touch-and-go-landings and a refueling, the student pilot and flight instructor departed again. Shortly after departure, the engine began to vibrate and lose power. The flight instructor took control of the airplane and landed straight ahead. During landing, the airplane impacted a row of tractor tires.

Postaccident examination of the engine revealed no evidence of mechanical malfunctions or failures that would have precluded normal operation. The atmospheric conditions at the time of the accident were conducive to the accumulation of carburetor icing. The flight instructor stated that he applied carburetor heat once he noted the drop in rpm. After applying carburetor heat and noting the continued loss of rpm, he turned off the carburetor heat to reduce the loss of rpm and to extend the airplane's glide range. Rapid ice accumulation would have required the carburetor heat to be on for a longer period of time to fully melt the ice and restore full power to the engine. Therefore, it is likely that the carburetor accumulated ice during departure, which resulted in the partial loss of engine power and vibration during the subsequent climb. 

Probable Cause and Findings

The National Transportation Safety Board determines the probable cause(s) of this accident to be:
The partial loss of engine power due to carburetor icing.

Findings

Environmental issues
Conducive to carburetor icing - Effect on operation (Cause)

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

Additional Participating Entity:
Federal Aviation Administration / Flight Standards District Office; Pittsburgh, Pennsylvania

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/N750AZ

NTSB Identification: ERA16LA270
14 CFR Part 91: General Aviation
Accident occurred Sunday, July 24, 2016 in Waynesburg, PA
Aircraft: CRAIG D CARTER STOL CH 750, registration: N750AZ
Injuries: 2 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.

On July 24, 2016, about 0915 eastern daylight time, an experimental amateur-built Zenith STOL CH 750, N750AZ, was substantially damaged during a forced landing following a loss of engine power during the initial climb after takeoff from Greene County Airport (WAY), Waynesburg, Pennsylvania. The flight instructor and a student pilot were not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local instructional flight conducted under the provisions of 14 Code of Federal Regulations Part 91.

The purpose of the flight was for the student pilot and flight instructor to practice touch-and-go landings. After about 0.8 hours of touch-and-go landings, they added 8 gallons of fuel. During the ensuing climb, about 1/2-mile beyond the runway at 300 feet, the engine began to vibrate and lose power. The instructor took control of the airplane and decided to land straight ahead. He noted that there was no oil pressure, normal oil temperature, and decreasing engine rpm. He elected to perform a forced landing on the midfield of the Green County Fairgrounds.

During the landing roll, the airplane impacted tractor tires and the landing gear folded back. Examination of the wreckage by a Federal Aviation Administration (FAA) inspector revealed damage to the wing spar and wing struts. Delaminating of the composite propeller, consistent with impact damage, was also noted.

The airplane was equipped with a Continental O-200-A EXP, 100-horsepower engine, which was examined by an FAA inspector. The accessory section, and oil pump was removed for inspection, with no noted anomalies; about 5 quarts of oil was drained from the oil sump. The oil filter was opened and free of debris. The oil pressure sending unit was removed and tested, no malfunction was observed. Thumb compression was obtained on all cylinders. The #2 cylinder had lower compression than the other cylinders. Engine powertrain continuity was established and no anomalies that would have precluded normal operation were observed. Fuel drained from the wing tanks were free of debris or contamination.

The closest weather reporting facility was the about 15 miles north of the accident site. At 1035, the weather conditions reported at Washington County Airport (AFJ) included temperature 29 degrees C; dewpoint 23 degrees C.

According to a statement provided by the flight instructor, the carburetor heat was not used during takeoff, "as recommended in the pilot manual," and "carburetor heat was applied at the first sign of vibration and power reduction." After applying carburetor heat and noting the loss of RPM, the instructor turned the carburetor heat off to get as much power from the engine as possible to extend their glide range.

An FAA carburetor icing probability chart indicated the temperature and dew point conditions were conducive to the formation of serious icing at glide power, and icing at glide and cruise power.

According to the FAA Pilot's Handbook of Aeronautical Knowledge, carburetor ice occurs due to the effect of fuel vaporization and the decrease in air pressure in the carburetor's venturi, which can cause a sharp temperature decrease in the carburetor. If water vapor in the air condenses when the carburetor temperature is at or below freezing, ice may form on the internal surfaces of the carburetor, including the throttle valve. This then restricts the flow of the fuel/air mixture and reduces engine power. Generally, the first indication of carburetor icing in an airplane with a fixed-pitch propeller is a decrease in engine rpm, which may be followed by engine roughness. Under certain conditions, carburetor ice can build unnoticed until power is added.

The handbook further described that carburetor heat is an anti-icing system that preheats the air before it reaches the carburetor, and is intended to keep the fuel/air mixture above the freezing temperature to prevent the formation of carburetor ice. Carburetor heat can be used to melt ice that has already formed in the carburetor if the accumulation is not too great, but using carburetor heat as a preventative measure is the better option.

NTSB Identification: ERA16LA270
14 CFR Part 91: General Aviation
Accident occurred Sunday, July 24, 2016 in Waynesburg, PA
Aircraft: CRAIG D CARTER STOL CH 750, registration: N750AZ
Injuries: 2 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 July 24, 2016, about 1030 eastern daylight time, an experimental, amateur-built Zenith STOL CH 750, N750AZ, operated by a private individual, was substantially damaged during a forced landing, following a loss of engine power during the initial climb after takeoff from Greene County Airport (WAY), Waynesburg, Pennsylvania. The flight instructor and a student pilot were not injured. Visual meteorological conditions prevailed, and no flight plan was filed for the local instructional flight conducted under the provisions of 14 Code of Federal Regulations Part 91.

The purpose of the flight was for the student pilot and flight instructor to practice touch-and-go landings. The student pilot stated that they had completed a touch-and-go landing, when during the ensuing climb, the engine began to vibrate and lose power. They noted that there was no oil pressure and decreasing engine rpm, and elected to perform a forced landing straight ahead, on the midfield of the Green County Fairgrounds.

During the landing roll, the airplane impacted tractor tires and the landing gear folded back.

Examination of the wreckage by a Federal Aviation Administration inspector revealed damage to the wing spar.


The airplane was equipped with a Continental O-200, 100-horsepower engine, which was retained for further examination.













AIRCRAFT: 2014 Zenith CH-750 N750AZ Home Built Experimental, s/n: 75-8188, 75 TOTAL HOURS* (estimated)

ENGINE:   Continental 0-200A, s/n: 65743-6-A.  Accessory case has been removed for inspection.  75 TOTAL HOURS*

PROPELLER:   Catto

AVIONICS: Dynon Skyview MFD PFD including SVXPNDE 262 remote mount transponder, Garmin SL30 Garmin GMA 340

DESCRIPTION OF ACCIDENT:  Loss of engine power resulting in forced landing

DESCRIPTION OF DAMAGES:    Firewall, Propeller, Lower Cowling, both wings destroyed. Landing Gear ripped from fuselage

LOCATION OF AIRCRAFT:  Greene County Airport, Waynesburg, PA       

REMARKS: Times are approximate as aircraft is not equipped with hobbs meter*

Read more here:  http://www.avclaims.com


FRANKLIN TWP. (KDKA) — Two men were able to walk away unhurt after their small plane crashed in Greene County.

According to the Observer-Reporter,  it happened Sunday morning at the Greene County Fairgrounds.

The 71-year-old pilot, Daniel Dean Smith, and 71-year-old co-pilot, Paul Henry Dawson, were flying the fixed-wing airplane when they had to perform an emergency landing.

“I just started flying, we were taking off and landing in the grass,” Smith said. “The engine was running rough so I turned to Paul and said ‘what’s going on?'”

“We noticed we had lost all oil pressure,” said Dawson, the more experienced flier, who took over controls when trouble began.

Dawson thought putting the plane down at the fairgrounds would be smooth, but it didn’t go as planned.

The aircraft hit a large tire while landing, causing damage to the landing gear.

“I think we were a little bit in shock, at least I was. He said ‘you okay?’ I said ‘I’m okay,'” Smith said. “He [Dawson] did a great job.”

Story and video:   http://pittsburgh.cbslocal.com

Two men escaped injury when their small, fixed-wing airplane crashed while making an emergency landing Sunday morning at the Greene County Fairgrounds in Franklin Township.

State police in Waynesburg said Daniel Dean Smith, 71, of New Freeport, and Paul Henry Dawson, 71, of Greensburg, were operating the airplane when they had to execute the emergency landing about 9:30 a.m. 

The airplane hit a large tire while landing, causing damage to the landing gear. The airplane came to rest in a grassy area.

The Federal Aviation Administration is investigating.

No comments: