AKA: D-1;S1035X. Status: operational 1998. Gross mass: 12 kg (26 lb).
The design of the suit was based on the S1035 Advanced Crew Escape Suit (ACES) worn by Shuttle crew-members during launch and re-entry phases of flight, but was upgraded with specific mobility enhancements. The design objective for the D-1 suit was for a predominantly "all-soft" (i.e., fabric) suit system which incorporated minimal bearings and could operate at 3.75 psi pressure. The shoulder joint incorporated a cable-assisted, flat-patterned fabric joint system with an upper arm bearing. The upper arm bearings were the only bearings used in the D-1 suit. The waist/hip joint arrangement was similar in nature to the shoulder joint in the use of a flat-patterned fabric element coupled with a cable-assisted system. The elbow, knee, and ankle joints all utilized fabric, flat-patterned joint elements. The suit incorporated a horizontal, mid-body closure ring for donning and doffing. Additional ancillary items that were representative of an extra- vehicular suit configuration would be integrated into the D-1 configuration. The prototype D-1 suit assembly weighed 12 kg., exclusive of the ancillary extravehicular items.