Summary
On July 30, 2019, a Piper PA28 (N6754J) was involved in an incident near Fairhope, AL. All 2 people aboard were uninjured. The aircraft sustained substantial damage.
The National Transportation Safety Board determined the probable cause of this incident to be: Failure of the No. 3 exhaust valve and the subsequent loss of engine power due to engine operation with an excessively lean fuel mixture over a period of time.
On July 30, 2019, about 1630 central daylight time, a Piper PA28-140 airplane, N6754J, conducted a forced landing after departing the H L Sonny Callahan Airport (CQF), Fairhope, Alabama. The flight instructor and student pilot were not injured, and the airplane sustained substantial damage. The airplane was registered to and operated by Lightning Aviation, LLC under the provisions of Title 14 Code of Federal Regulations Part 91 as an instructional flight. The flight instructor reported that he was preparing the student pilot for his private pilot check ride and they had finished several touch-and-go landings. After the final landing, they planned to return to the Foley Municipal Airport (5R4). Shortly after take-off, the engine started a severe vibration, and then lost power.
This incident is documented in NTSB report CEN19LA265. AviatorDB cross-references NTSB investigation data with FAA registry records to provide comprehensive safety information for aircraft N6754J.
Accident Details
Probable Cause and Findings
Failure of the No. 3 exhaust valve and the subsequent loss of engine power due to engine operation with an excessively lean fuel mixture over a period of time.
Aircraft Information
Registered Owner (Historical)
Analysis
On July 30, 2019, about 1630 central daylight time, a Piper PA28-140 airplane, N6754J, conducted a forced landing after departing the H L Sonny Callahan Airport (CQF), Fairhope, Alabama. The flight instructor and student pilot were not injured, and the airplane sustained substantial damage. The airplane was registered to and operated by Lightning Aviation, LLC under the provisions of Title 14 Code of Federal Regulations Part 91 as an instructional flight.
The flight instructor reported that he was preparing the student pilot for his private pilot check ride and they had finished several touch-and-go landings. After the final landing, they planned to return to the Foley Municipal Airport (5R4). Shortly after take-off, the engine started a severe vibration, and then lost power. The instructor then preformed a forced landing in a cornfield, about two miles from the airport.
An examination of the airplane by a Federal Aviation Administration inspector, found damage to the airplane's left wing and engine mount. Further examination of the engine's No. 3 cylinder revealed a failed exhaust valve. The examination also found extensive erosion on the No. 4 cylinder exhaust valve. He also noted that the engine had 2,600 hours since the last overhaul, adding that the engine manufacturer's recommended overhaul is 2,000 hours, and the flight school consistently ran the engines past the recommended overhaul time.
Figure 1: Failed Exhaust valve FAA photo
The flight instructor reported that the leaning technique used while on the ground, was to lean during taxi or engine idle. For the engine runup, they would go to a full rich mixture. He added that during flight maneuvers at or below 3,000 ft msl, they would not lean the mixture.
Data Source
Data provided by the National Transportation Safety Board (NTSB). For more information on this event, visit the NTSB Records Search website. NTSB# CEN19LA265