A detailed investigation into SL-1 determined that one operator (perhaps inadvertently) manually pulled the 84-pound (38 kg) central control rod out about 26 inches rather than the maintenance procedure's intention of about 4 inches.
Detaljnja istraga u SL-1 ustanovila je da je jedan operater (možda nehotice) ručno izvukao 38 kg težak centralni kontrolni štap oko 26 inča više nego što je procedurom održavanja namjeravano oko 4 inča.