Liquid nitrogen lines are being used to freeze portions of Space Shuttle Atlantis' hydraulic lines leading to and from the Power Drive Unit (PDU) to prevent air intrusion during its removal. PDU replacement is expected to occur without impacting the April 24 launch date on mission STS-101. (Photo Release Date: 04/11/2000 )

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STS-101 KSC Photo IndexNext Image KSC-00PP-0489

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