聽說NASA的太空梭在發射升空階段，如何從技術角度實現大氣層內發射不成功時保證宇航員逃生?的背景很複雜,是不是真的?

逃逸塔聽說發揮過一回作用：

OnlyoneemergencyuseofanLEShasoccurred.ThisoccurredduringtheattempttolaunchSoyuzT-10-1onSeptember26,1983.Therocketcaughtfire,justbeforelaunch,buttheLESwasabletocarrythecrewcapsuleclear,secondsbeforetherocketexploded.Thecrewweresubjectedtoanaccelerationof14to17g(140to170m/s2)forfiveseconds.Reportedly,thecapsulereachedanaltitudeof2,000meters(6,500ft)andlanded4kilometers(2.5mi)fromthelaunchpad.OntheSoyuz,thegridfinsalsodeployonthepayloadfairingtostabilizethecraft.

關鍵詞是：justbeforelaunch。發射前用過。也便是說，真到了挑釁者號那種70多秒的高度和速率，環境到底怎樣還不好說。並且看這段筆墨的意思，從出現非常到火箭爆炸，經歷了好幾秒的時間，這個對付逃逸塔來說，時間算是比較充分了。關於同盟10號的這次發射，細緻見：