The airline transport pilot reported that, during a formation flight, the Yak 52’s engine started to run rough. Unable to maintain level flight, he detached from the formation to troubleshoot the problem.
He noted there were about 29 gallons of useable fuel onboard and all other indications were normal. The engine continued to lose power, and about 500′ above the ground, he elected to land in a vineyard in Porterville, California. [Read more…]