page_title: TDRS-4
hierarchical_section_title: TDRS-4
caption_attribution_description: English: Deployment of the fourth Tracking and Data Relay Satellite during STS-29.
context_page_description: TDRS-4, known before launch as TDRS-D, is an American communications satellite, of first generation, which was operated by NASA as part of the Tracking and Data Relay Satellite System from 1989 until 2011. It was constructed by TRW, based on a custom satellite bus which was used for all seven of the first generation TDRS satellites.
context_section_description: TDRS-4, known before launch as TDRS-D, is an American communications satellite, of first generation, which was operated by NASA as part of the Tracking and Data Relay Satellite System from 1989 until 2011. It was constructed by TRW, based on a custom satellite bus which was used for all seven of the first generation TDRS satellites.
caption: TDRS-D being deployed from Discovery
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