A newly released preliminary investigation has found cracks in hardware meant to hold the left engine to the UPS cargo plane that crashed, killing and injuring dozens of people in Louisville.

The Kentucky Lock Addition Project – a more than $1.5 billion federal construction effort led by government contractors and U.S. Army Corps of Engineers (USACE) workers – aims to solve a logjam on Tennessee River by doubling the length of the lock that flows resources and products to 20 states.