NASA – Live Spacewalk, Pump repair

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Crew Conducts Second Spacewalk to Replace Coolant Pump

ISS024-E-007122: Soyuz TMA-19 and ISS Progress 37 Image above: The Soyuz TMA-19 spacecraft (foreground), docked to the Rassvet Mini-Research Module 1, and ISS Progress 37 resupply vehicle, docked to the Pirs Docking Compartment, are featured in this image photographed by an Expedition 24 crew member on the International Space Station. Credit: NASA

Expedition 24 Flight Engineers Doug Wheelock and Tracy Caldwell Dyson switched their spacesuits to battery power at 8:27 a.m. EDT, signaling the start of the second of three spacewalks focused on removing the ammonia pump module that failed July 31 and putting its replacement in place. Today’s spacewalk is expected to last about six hours.

This is the fifth spacewalk for Wheelock, who is wearing the suit bearing the red stripes, and the second for Caldwell Dyson, who is wearing the unmarked suit.

The spacewalkers will isolate the Loop A ammonia cooling line upstream from the fourth and final fluid line connector by closing quick disconnect valves, then will use a tool to vent residual ammonia from the failed pump module before the final cooling line is disconnected. That will lead to the disconnection of five electrical and data cables and four bolts from the old pump so it can be extracted from the truss through the use of a grapple bar and parked on a payload bracket on the station’s Mobile Base System.

If all goes as planned, the spare pump will be installed during the third spacewalk targeted for no earlier than Sunday.

Expedition 24 Spacewalk Briefing
08.02.10

Courtenay McMillan, Expedition 24 Flight Director

Worksite Overview

Worksite Overview
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S1 Location Bay 7

S1 Location Bay 7
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Replacement Pump Module Location on ESP-2

Replacement Pump Module Location on ESP-2
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Spare Pump Module

Spare Pump Module
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