Cessna 177RG N2108Q accident near Black River Falls, Wisconsin

Probable cause

The loss of engine power during cruise due to the number two cylinder piston connecting rod failure for undetermined reasons.

NTSB analysis

The pilot reported that he noticed the engine oil temperature indicator read too high during cruise. He opened the cowl flaps, reduced engine power, and enriched the mixture. He stated that the oil temperature decreased. However, he determined that it was still too high for safety purposes. The engine stopped and oil covered all but the far left side of the windshield. He declared an emergency, started gliding, and lowered the gear on approach. He said, “On final it became clear that I had circled to[o] wide to make the runway, but maintained best glide until striking the garage.” An examination of the airplane indicated that the number two cylinder piston connecting rod failed and fractured the top of the engine case. The cause of the piston rod failure was not determined.

Text from the NTSB. Open the NTSB docket for CEN09LA487 for the full record.