6 9 2 , ▁was ▁turned ▁over ▁to ▁the ▁Naval ▁A ircraft ▁Factory ▁at ▁Philadelphia , ▁where ▁it ▁operated ▁from ▁Must in ▁Field ▁until ▁it ▁was ▁dam aged ▁in ▁a ▁crash ▁landing ▁this ▁date ▁and ▁struck ▁off ▁charge ▁the ▁same ▁month . ▁ 1 0 ▁March ▁Lock he ed ▁Y 1 C - 1 7 , ▁ 3 1 - 4 0 8 , ▁V ega ▁Model ▁D L 1 B ▁Special , ▁c / n ▁ 1 5 9 , ▁assigned ▁at ▁Bol ling ▁Field , ▁Washington , ▁D . C ., ▁cra cks ▁up ▁during ▁forced ▁landing ▁at ▁Tol u , ▁Kentucky ▁during ▁attempted ▁trans cont inental ▁record ▁flight ▁by ▁Capt . ▁Ira ▁C . ▁E aker , ▁pilot ▁unh urt . ▁Spe cially ▁rig ged ▁gas ▁lines ▁had ▁le aked ▁air ▁which ▁shut ▁off ▁fuel ▁flow ▁to ▁engine . ▁W reck age ▁taken ▁to ▁Wright ▁Field , ▁Ohio , ▁scra pped ▁ 2 2 ▁April ▁ 1 9 3 1 . ▁Was ▁the ▁fast est ▁USA AC ▁aircraft ▁of ▁its ▁time ▁at ▁ 2 2 1   m ph . ▁Total ▁air frame ▁flight ▁time ▁ 3 3 ▁hours . ▁ 1 5 ▁April ▁Ke yst one ▁X OK - 1 , ▁Bu No ▁A - 8 3 5 7 , ▁dis integr ates ▁in ▁d ive ▁during ▁tests ▁this ▁date , ▁during ▁a ▁demonstr ation ▁before ▁naval ▁officials ▁when ▁a ▁piece ▁of ▁its ▁N AC A - style ▁engine ▁cow ling ▁det ached ▁itself , ▁sm ashed ▁into ▁the