XA/EVA Project Office Weekly Activity Report May 10, 2001

Concept Review for Possible Retrieval of the Upper Atmosphere Research Satellite (UARS)

EVA Project Office personnel supported a concept review for the possible Space Shuttle retrieval of the UARS on May 3, 2001. At this point, several different options are still under consideration. The mission would require at least one scheduled EVA to secure various deployable components on the spacecraft. UARS was originally designed to be compatible with EVA operations, so most of the tasks appear to be feasible. An EVA splinter meeting is scheduled for May 10, 2001, to further discuss the EVA requirements for this proposed mission.

Space Station Remote Manipulator System (SSRMS) Latching End Effector (LEE)/Joint Flight Support Equipment (FSE) Neutral Buoyancy Laboratory (NBL) Verification Test

The EVA Project Office participated in the SSRMS LEE/FSE NBL Verification Test that occurred April 23-26, 2001. The test evaluated LEE/Joint worksite access from the 7A.1 Integrated Cargo Carrier (ICC) and from a Flight Releasable Attachment Mechanism (FRAM) on a Crew Equipment Translation Aid (CETA) cart. 7A.1 LEE/Joint objectives included evaluating access to the LEE EVA latch override, the FSE hook drives, the Expandable Diameter Fasteners (EDF’s) and mating the LEE/Joint with the lug/clevis interface. The final results will be published in the Test Report.

ISS EVA PLAN

The ISS EVA Plan is being updated to reflect the Assembly Sequence (Rev. G) currently being developed by the Assembly Sequence Working Group. The Assembly Sequence (Rev. G) will incorporate changes to flight manifests, launch dates, and the crew rotation plan. The ISS EVA Plan will be presented to the EVA CCB on June 1, 2001 for approval, and provided to the Program Office for use in updating the Multi-Increment Manifest (MIM) document. The ISS EVA Plan will be available on the EVA Project Office home page after its approval by the EVA CCB.

8A Acceptance Review Board

The EVA Project Office endorsed acceptance of the S0 Truss Segment and Mobile Transporter (MT) during the 8A Acceptance Review Board on May 3, 2001. The review assessed the technical risk associated with 1257 open items, of which eleven belong to the EVA Subsystem. All but one were deemed low risk and are expected to close without issue after completion of scheduled fit checks, limit load verification, and on-orbit constraints testing. The one exception acknowledged potential on-orbit interference between the Module-to-Truss Structure and the EVA Pistol Grip Tool. This issue was categorized as medium risk since it carries a design threat in the event that S0 torque requirements cannot be relaxed or accommodated with alternate EVA tools. Resolution is in work through the 8A EVA IPT. Overall, requirements compliance for S0 and the MT has been fully established through seven years of neutral buoyancy development testing and human thermal vacuum testing. Particular attention has been paid to verification of fit and function to enable on-orbit connection of multiple rigid structures between S0 and the pressurized elements.

Original signed by:

G. Allen Flynt

Acting Manager