Natick Letter with Changes Redacted.pdf

This document is a memorandum from the U.S. Army Natick Soldier Center (NSC) Aerial Delivery Engineering Support Team (ADEST) detailing preliminary changes to Helicopter Sling Load (HSL) Training Blocks and specific requirements for a 4000 lb Training Block. The changes include material modifications for lift eyes (switching from 440C Stainless Steel to 1018 or 1020 Cold Rolled Carbon Steel), adding a surface finish for corrosion resistance, and adjusting construction parameters.

Key design modifications for the 4000 lb block include reducing the length from 138.5 to 95.0 inches, marking sides with 8-inch high black "4000" characters, reducing reflectors from 22 to 16, reducing lateral vertical rebar loops from 23 to 15, and leaving the concrete in its natural color without added dye. The document specifies that these changes are part of creating HSL Training Blocks for various military entities, with the understanding that the information will be passed to contractors. The changes aim to improve the technical specifications and manufacturing standards of the training blocks.