english: Actually the critical point was in 1989, when we demonstrated the stability of this vehicle -- how completely stable it was in all circumstances, which is of course very critical.
non_english: Aslında 1989 dönüm noktasıydı,... ...bu aracın dengesini her koşulda tamamen... ...sabit olarak dengede tutabildiğimizi ispatlamış olmak,... ...tabiki çok ciddiydi.