tˈɛstɪŋ ɔnðə ɡɹˈaʊnd hæd ʃˈoʊn ðætðə sˈɜːvɪs pɹəpˈʌlʃən sˈɪstəm ˌɛspˌiːˈɛs ˈɛndʒɪn hæd ɐ smˈɔːl tʃˈæns ʌv ɛksplˈoʊdɪŋ wɛn bˈɜːnd fɔːɹ lˈɔŋ pˈiəɹɪədz ʌnlˈɛs ɪts kəmbˈʌstʃən tʃˈeɪmbɚ wʌz "kˈoʊɾᵻd" fˈɜːst baɪ bˈɜːnɪŋ ðɪ ˈɛndʒɪn fɚɹə ʃˈɔːɹt pˈiəɹɪəd.
Testing on the ground had shown that the service propulsion system (SPS) engine had a small chance of exploding when burned for long periods unless its combustion chamber was "coated" first by burning the engine for a short period.