The pilot reported that, while the Ryan Navion was on short final to the runway in Fresno, Calif., he increased power to maintain the glideslope and then heard a muffled “bang or chug,” followed by the engine sounding “as if it were drowning.”
The airplane started to descend, and the pilot executed an off-airport landing.
During the landing, the left wing hit a fence. The airplane then crossed a median and came to rest against a second fence.
The NTSB determined the probable cause as a partial loss of engine power for reasons that could not be determined.
NTSB Identification: WPR14LA337
This August 2014 accident report is provided by the National Transportation Safety Board. Published as an educational tool, it is intended to help pilots learn from the misfortunes of others.