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March 21, 2014
(30 June 2011) --- NASA astronauts Mike Fossum (left) and Ron Garan, both Expedition 28 flight engineers, perform in-flight maintenance in the Harmony node of the International Space Station. The maintenance involved removing and replacing the failed Common Cabin Air Assembly (CCAA) heat exchanger in the P3 Midbay with a new spare Heat Exchanger Orbit Replaceable Unit (HX ORU) and lines.

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