▁failure ▁in ▁a ▁spin / st all ▁with ▁only ▁ 8 0 ▁flying ▁hours , ▁killing ▁pilot ▁Andrew ▁D . ▁Kno x . ▁This ▁air frame ▁had ▁won ▁the ▁P urs uit ▁Pl ane ▁Race ▁in ▁the ▁ 1 9 2 7 ▁National ▁Air ▁R aces ▁with ▁a ▁speed ▁of ▁ 1 8 9 . 6 0 8   m ph . ▁ 2 1 ▁April ▁A ▁U . S . ▁Army ▁Air ▁Corps ▁Bo eing ▁P W - 9 D , ▁ 2 8 - 0 3 7 , ▁c / n ▁ 1 0 2 2 , ▁coll ided ▁with ▁a ▁Ford ▁ 5 - AT - B ▁Tr im ot or , ▁NC 9 6 3 6 , ▁c / n ▁ 5 - AT - 1 0 , ▁operated ▁by ▁Mad du x ▁Air ▁L ines ▁over ▁San ▁Diego , ▁California , ▁killing ▁all ▁ 6 ▁on ▁board ▁both ▁aircraft . ▁ 1 8 ▁May ▁During ▁the ▁ 1 9 2 9 ▁U . S . ▁Army ▁man eu vers , ▁two ▁Bo eing ▁P - 1 2 s ▁of ▁the ▁ 9 5 th ▁P urs uit ▁Squadron , ▁operating ▁out ▁of ▁N orton ▁Field ▁( the ▁first ▁air field ▁to ▁be ▁built ▁in ▁central ▁Ohio ), ▁col lide ▁over ▁the ▁L inden ▁neighborhood ▁on ▁the ▁north ▁side ▁of ▁Columb us , ▁Ohio , ▁the ▁prop eller ▁of ▁ 2 nd ▁L t . ▁Andrew ▁F . ▁Sol ter ' s ▁XP - 1 2 A , ▁