The Boeing 727 acquired a reputation for shedding engines. The process was ice buildup on the right side due to leaking lavatory plumbing, the ice falling off and into the No. 3 engine where it caused damage to the fan blades. The resulting imbalance lead to vibrations, and the engine was designed to shear off in that case.

This New York Times article describes one case where a 727 lost its engine over Florida. The article continues:

Cases of engines falling from airplanes are rare. In 1974 a National Airlines 727 lost an engine near Sierra Blanca, Tex. In 1985 an American Airlines 727 flying from Dallas to San Diego lost an engine near Deming, N.M.

I would expect this happened also to some Russian airplanes, but here the reporting is less up-front, so I know of none.

The Boeing 727 acquired a reputation for shedding engines. The process was ice buildup on the right side due to leaking lavatory plumbing, the ice falling off and into the No. 3 engine where it caused damage to the fan blades. The resulting imbalance lead to vibrations, and the engine was designed to shear off in that case.

This New York Times article describes one case where a 727 lost its engine over Florida. The article continues:

Cases of engines falling from airplanes are rare. In 1974 a National Airlines 727 lost an engine near Sierra Blanca, Tex. In 1985 an American Airlines 727 flying from Dallas to San Diego lost an engine near Deming, N.M.

I would expect this happened also to some Russian airplanes, but here the reporting is less up-front, so I know of none.