An investigation lasted a month and found that the part that failed had been tested 8,000 times previously without failing, and the Soyuz engine had fired some 2,000 times since 1967, also without a single failure.
التحقيق استمر لمدة شهر وجدت أن الجزء الذي فشل قد تم اختبارها 8000 مره سابقا دون فشل ، سويوز أطلقت بعضها 2000 مرة منذ عام 1967 ، أيضا دون أي فشل.