MSG Seal Replacement Mission Scenario Pre-Pack List (SOC OCR – ULF 1.1) MSG Front Window Exchange MSG Glove Rings & Feed- through Install MSG AL Front Door Seal Replacement MSG AL Top Lid Seal Replacement MSG Loading Port Seal Exchange MSG Front Filter Exchange S2,3.1, MSG WV Leak Test Part 1 S MSG WV Leak Test Part 2 S4-5 MLC File Dump TBD Min 55 Min 10 Min 25 Min 40 Min 25 Min 40 Min 35 Min 20 Min Before ULF1.1 Dock During Docked Ops Post Docked Ops Assumptions 1,2 Pre-Pack List Assumption 3 MSG Activation MSG Ground Monitoring – 75 Min More Info

Assumptions Do not pre-pack if InSPACE or PFMI are scheduled for operations increment 12 or increment 13. Payload ops will require MSG facility pre-pack items. You can pre-pack before launch of ULF1.1 with the understanding that a launch scrub may require reinstallation of pre-pack hardware. All seals have been replaced.

Pre-pack List (Investigation Required Items) 2" Feedthrough Type 3 (Video) 2" Feedthrough J403 2" Feedthrough J404 Filter Cap Assy MSG Front Filters (2.003 MSG Front Filter Exchange S1, 3.1, 3.2, and 3.5) 6" Closed Glove Ring Assy Glove Ring Assy - 4" (Size 7) Glove Ring Assy - 4" (Size 9) Glove Ring Assy - 4" (Size 10) Glove Ring Assy - 6" (Size 7) Glove Ring Assy - 6" (Size 9) Glove Ring Assy - 6" (Size 10)

Performed during Docked Ops Remove and temporarily stow MSG Front Glove Ring Assemblies from MSG Front Window Loosen Front Window captive fasteners (24) Remove and temporarily stow old MSG Front Window (stow w/fastener ends away from Crew) Transfer new MSG Front Window w/packing from Shuttle to ISS Install new Front Window Stow old MSG Front Window into new MSG Front Window packing materials Transfer old MSG Front Window from ISS to Shuttle MSG Front Window Exchange MSG Front Window with 24 captive fasteners

Hardware Exchanges Procedures are only provided for activities that are not already covered by skills learned during nominal ground training Left to right - Top row; MSG AL Glove Port Seal (black sleeve extending from outer gloveport must be removed because of new AL Glove Ring design), MSG Blank Glove Ring Assy (4” Glove Ring Closed identical just smaller), MSG Particle Cap with Adapter, 6” Glove Ring Assy (4” Glove Ring Assy identical just smaller) Bottom row; Video Feedthrough, J403 Data Feedthrough, J404 Data Feedthrough, and new MSG Filtercaps.

4.051 MSG Airlock Front Door Seal Replacement Remove AL Front Door (4 latches OPEN) and temporarily stow Remove MSG AL Front Door Seal and replace with new seal (no tools required) MSG AL Front Door Seal shown with seal corner unseated

Remove AL Top Lid (raise to 90°, release from hinge pins) and temporarily stow Remove MSG AL Top Lid Seal and replace with new seal (no tools required) MSG Airlock Top Lid Seal Replacement MSG AL Top Lid Seal shown with Lid removed°

Remove old Seals from MSG Loading Ports Install new Seals in MSG Loading Ports (use non-metal blunt tool if necessary to seat seal) Install MSG Loading Ports into Core Facility MSG Loading Port Seal Exchange MSG Loading Port with 16” Seal exposed

2.003 MSG Front Filter Exchange Access the twelve MSG Front Filters through open, Front Glove Ports – remove and replace with new Filters Open Airlock Door (from the left) and remove the single Front Filter Top – WV Filterbanks (12 filters to be replaced); Bottom – AL Filter (1 to be replaced)

MSG Activation/Deactivation Activation RPC Closed ESEM Cmding Main Power MLC On Fans On √ PNeg √ Health Action RequiredCrew Deactivation Fans Off Lights Off MLC Off STBY Power RPC Open Action RequiredCrew

2.036 MSG Work Volume Leak Test The main objective of the test is to verify MSG’s sealed environment (level of containment). This test is to be performed after all hardware exchanges, seal replacements, and a seal removal have been completed. The test will be accomplished by. –Sealing off the work volume using new flapper bank covers, new MSG Filtercaps, and Kapton™ tape. –Powering AIR CIRC – ON and generating a negative pressure in the 8-10 mbar range. –Powering AIR CIRC – OFF and waiting approx 30 minutes checking for an acceptable pressure decay. Note the new Flapper Bank Covers (3) designed specifically for the MSG WV Leak test. New MSG Filtercaps are used along with Kapton™ tape over the AL air return to ensure no air flow out through the filters or AL inlet.