wˌɛn ðæt pɹˈɑːdʒɛkt fˈɪnɪʃt, ðə stˈeɪʃən sˈiːst ɹuːtˈiːn ˌɑːpɚɹˈeɪʃənz ɪmˈiːdɪətli ˈæftɚɹ ɐn ˈætməsfˌɪɹ ɛksplˈoːɹɚsˈiː sˈæɾəlˌaɪt pˈæs ˌɔn fˈoːɹ ɑːktˈoʊbɚ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈoːɹ, bˌʌt səfˈɪʃənt kˌeɪpəbˈɪlᵻɾi wʌz ɹᵻtˈeɪnd fɔːɹ wˈʌn fˈaɪnəl mˈɪʃən mˈaɪnəs ðə tɹˈænzsˈoʊlɚɹ ɪnsˈɜːʃən ʌv hˈɛlɪˌoʊzɐ ˌɔn tˈɛn dᵻsˈɛmbɚ nˈaɪntiːnhˈʌndɹɪd sˈɛvənti fˈoːɹ.
When that project finished, the station ceased routine operations immediately after an Atmosphere Explorer-C  satellite pass on 4 October 1974, but sufficient capability was retained for one final mission − the trans-solar insertion of Helios-A on 10 December 1974.