Helicopter Rockfall Protection 1
ฝัง
- เผยแพร่เมื่อ 9 ก.ย. 2014
- Midwest Helicopter Airways, Inc, hanging rockfall protection netting on the side of a quarry wall in the Chicagoland area. At times netting reached nearly 300' in length and the helicopter had to descend below the quarry wall to properly hang the net.