Isolated Masonry Piers 1. You may use hollow core concrete masonry units (concrete blocks) to build isolated masonry piers if the units are at least (â¥) 8 inches thick and not longer than (â¤) 3 times the unit thickness.
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The Sikorsky UH-60 Black Hawk is a four-bladed, single-rotor, medium-lift, utility helicopter. The latest configuration, the UH-60M, is powered by two General Electric T700-GE-701D turboshaft engines with 1,994 shp each.ikorsky delivered the first full rate production UH-60M in December 2007 - preceded by 31 low rate initial production (LRIP) aircraft delivered from 2005-2007. The first U.S. Army HH-60M MEDEVAC helicopter (outfitted with a dedicated clinical cabin) was delivered in August 2008.