The Extravehicular Activity Development Flight Test - 05 consists of the payload bay hardware elements of Detailed Test Objective (DTO) 671, EVA Hardware for Future Scheduled Extravehicular Missions. EDFT - 05's main objective is to demonstrate International Space Station (ISS) on-orbit, end-to-end EVA assembly and maintenance operations. The other DTO's included in this test are DTO 672, Extravehicular Mobility Unit (EMU) Electrical Cuff Checklist and DTO 833, EMU Thermal Comfort and EVA Worksite Thermal Environment. Another objective is to expand the EVA experience base for ground and flight crews. Two EVA's will be performed on this mission to accomplish these DTO's.
The portside-mounted EDFT-05 hardware is in bay 7 and consists of the Orbital Replacement Unit (ORU) Transfer Device (OTD), a Pitch/Yaw Worksite Interface (WIF) Fitting, and Flight Support Equipment (FSE) to the sidewall carrier.
The starboard-mounted EDFT-05 hardware consists of bay 2 Portable Work Platform (PWP) components including the Articulating Portable Foot Restraint (APFR), Temporary Equipment Restraint Aid (TERA), and Work Station Stanchion (WSS). Bay 7 contains the ORU Simulator and Carrier Assembly (OSCA) consisting of a Battery ORU Simulator attached to the Cargo Handling Interface Assembly (CHIA), and the Dry Carrier (DCC) Simulator. Bay 8 houses an adapter plate with WIF's and a mounting location for the cable caddy.
During launch and landing EVA equipment stowage requires orbiter middeck locker space and the starboard Portable Stowage Assembly (PSA).
Prior to scheduled EDFT - 05 activities, orbiter cabin pressure will be lowered to 10.2 psi and the standard EVA prebreathe protocols started. EDFT - 05 activities require two crew members to perform two full-duration EVA's and one crew member to provide Intravehicular Activity (IVA) support.