STS-55 Commander Nagel and Pilot Henricks participate in KSC preflight tests

S93-29830 (4 Nov 1992) --- Inside the Spacelab D-2 module in the Operations and Checkout Building high bay, STS-55 Mission Commander Steven R. Nagel (left) and Pilot Terence T. Henricks are participating in a mission sequence test to check out experiment steps and procedures which will be conducted on-orbit. Spacelab D-2, the second German Spacelab, is scheduled to fly on space shuttle mission STS-55 in 1993.