National Aeronautics and Space Administration Microgravity Science Glovebox (MSG) Seal Exchange Overview February 2, 2006

( 2 ) MSG Seal Exchange Overview  All refurbishable parts to be pre-packed prior to ULF-1.1 except window  Descent manifest updated via CEF R0832  Metal parts that are cost prohibitive to replace, contain a replaceable expired rubber seal  Pre-pack should be scheduled to protect potential investigation operations  PFMI and InSPACE  All replacement parts manifested and at KSC  Window to be exchanged during docked operations  55 minutes of crew time required for complete window exchange  Remaining parts installed and stowed after ULF-1.1  Disposable parts to be trashed after replacement  Removable seals and filter cap with adapter  On-Orbit Leak Test performed to recertify MSG for sealed mode containment  Cartridge Adapter will eliminate need for Scavenge Pump and its resupply

( 3 ) Considerations for Return Plan  Minimize impact to on-orbit stowage  Optimize use of crew time  Minimize use of joint-ops crew time  Maintain a recovery plan in case of shuttle delay  Do not preclude reinstalling old parts  Refurbishable parts returned for use as future spares  Non-reusable parts to be discarded  Minimize impact to investigation operations

( 4 ) MSG Facility Items for ULF-1.1 Descent Descent Items Page 1 of 2

( 5 ) MSG Facility Items for ULF-1.1 Descent Descent Items Page 2 of 2  Most items are not installed on MSG Facility  64 Items to be returned  38 items can be pre-packed immediately with no impact to potential payload ops  25 items can be pre-packed with coordination with PromISS, PFMI, and InSPACE  1 item (window) is not pre-packed  10 Items will be removed and discarded after ULF-1.1 undock  Non-refurbishable items

( 6 ) Ascent Plan  All items required for seal replacement on manifest  Additional non-seals related items also manifested  All replacement parts manifested  R Add MSG PFMI Tapes to ULF-1.1  R MSG Manifest Change to ULF-1.1 Ascent/ Descent  Add Cartridge Adapter, Remove scavenge pump supplies, return scavenge pump  R Add spare front filters to ULF-1.1  R Add MSG Window, Filters, and supplies to ULF1.1 Ascent  R0776A - Update MSG Resupply on ULF1.1 Ascent  R0752- Additional MSG Resupply for ULF1.1 Ascent

( 7 ) MSG Facility Items for ULF-1.1 Ascent Ascent Items Page 1 of 2

( 8 ) MSG Facility Items for ULF-1.1 Ascent Ascent Items Page 2 of 2

( 9 ) Considerations for Window Exchange  Window Exchange plan presented at 10/26/05 PCB  PCB Chair directed exchange during docked ops  Optimize use of crew time  Splitting exchange into removal and installation increases crew time  Stow/Destow activities would be repeated, nearly double crew time  Stow/Destow activities are most significant crew time contributors  Minimize impact to on-orbit stowage  Avoid leaving window and packaging on orbit until next shuttle flight  Reuse ascent window packaging for return of old window

( 10 ) Transportation Packaging for Window

( 11 ) Window Exchange Procedure  MSG Front Window Exchange MGUEMSGN034  To be baselined by ECR E  Informally reviewed by crew office and ESA prior to ECR submission  Validated using Engineering Unit  Basic Steps  Retrieve tools and new window  Loosen 24 front window captive fasteners  Remove old window and temporarily secure  Remove new window from packaging and position onto MSG  Install four captive fasteners in center, then torque all fasteners  Label old window with IMS sticker and stow in packaging from new window  Stow tools  Uses ISS Standard Tools

( 12 ) Window Replacement Twenty four captive fasteners around the perimeter of the frame hold the window in place. An ISS 3mm hex head and driver is used to loosen fasteners. The same 3mm head is used with a torque driver to tighten the fasteners on the new window.

( 13 ) Window Size  Window size  7.70 kg  ~25” by 35”  Easily handled by one crew member  Window exchanged by one person on ground The MSG Front Window Assembly is shown during inspection at KSC.

( 14 ) Window Captive Fasteners The protruding threads of the captive fasteners are recessed in the window frame.

( 15 ) Exchange and Installation of Remaining Parts  Old Seals removed and marked for discard  2 Loading Port Seals  1 Airlock Top Lid Seal  1 Airlock Front Door Seal  1 Airlock Glove Ring Seal  Seals installed on Facility  2 Loading Port Seals  1 Airlock Top Lid Seal  1 Airlock Front Door Seal  13 Front Filters  3 Feedthroughs  All other parts placed in stowage

( 16 ) On-Orbit Leak Test  Verifies the containment provided by a physical barrier  Containment dependent upon properly functioning seals  Single method of containment for sealed mode  One of the two methods of containment for normal mode  Successful completion of test is basis for recertification of containment  Performed with MSG Facility Hardware

( 17 ) Development of Leak Test on EU  Development Test on EU  TPS #EI52-MSG-FU-032; results documented in TR05-MSG-003  Replicated Qualification Test run on FU prior to flight  MSG-BE-PR-0040  Test amended to minimize additional HW required on orbit  Test Results show EU’s old Norsorex seals failing leak test  Test Results also show EU’s new EPDM seals passing leak test  Newly-developed leak test was validated on EU

( 18 ) Leak Test Procedure Overview  Seal off Work Volume  Install Flapper Bank Covers  Install 6” Closed Glove Rings on Side Ports  Install Glove Rings with Glove Port Plugs on front  Install Filter Caps  One Filter Cap remains loose to allow AHU fans to lower WV pressure  Tape over AL Inlet  Pump down Work Volume  AHU Fans lower pressure in the work volume  WV pressure between 8 and 10 mbar below cabin pressure  Last filter cap is tightened and last glove port plug is installed  Monitor Differential Pressure from ground  Evaluate pressure decay against pass/fail criteria

( 19 ) Test Procedure Hardware This picture shows two of the three flapper banks covers installed. The flapper banks are the vents which allow air to return into the work volume. This picture shows the taped Airlock inlet and the installed filter caps.

( 20 ) MSG Cartridge Adapter vs. Scavenge Pump  Scavenge Pump used to clean up spilled liquids  Provides suction through an optional hose to Filter Cartridge  Filter Cartridge absorbs 20 ml of liquid  Scavenge Pump requires regular resupply  Replacement of limited-life o-ring and battery  Extension Hose has limited-life o-ring  Nitrile o-rings good for 3 years  Battery shelf life of 2 years  Cartridge Adapter allows alternate means of suction  Connects Filter Cartridge to Filter Cap with Adapter Hose  Uses suction provided by Work Volume Air Handling Unit fans  Filter Cap with Adapter Hose already used with Particle Catchers for cleaning up particulates  Cartridge Adapter requires no resupply

( 21 ) Logistics and Stowage Comparison Scavenge Pump Assembly P/N MSG1144 Extension Hose P/N MSG1045 Battery Cartridge Adapter P/N 96M Cartridge Adapter 0.03 kg 16 cm 3 Scavenge Pump 0.36 kg 436 cm 3 Extension Hose 0.11 kg 692 cm 3 Battery 0.15 kg 10 cm <<

( 22 ) MSG Cartridge Adapter Installation Filter Cap with Adapter Cartridge Adapter Filter Cartridge

( 23 ) MSG Cartridge Adapter Description  Materials already used elsewhere in Work Volume  Aluminum Alloy  Hard Black Anodize per MIL-A-8625  O-Ring made from V0747 Viton  Anodized Aluminum and Viton compatible with spilled materials  Hard Black Anodize provides standard material compatibility  Viton O-Ring compatible with all materials expected in Work Volume  Lifetime of Viton o-ring will outlast the MSG Facility itself  Adapter performance verified using Filter Cartridge  Picked up 20 ml of DI Water in Engineering Unit testing  Per MSG System Specification MSG-RIBRE-SPE-0001 Issue 4