Alex,
Frequent references to Capt Walter C. Kennedy here
http://www.gotech.at/lale9/langenlebarn_9_1.html but no mentioning of a crash on 7 July 1951 in otherwise very detailed history.
There was one on 6 Aug 50 with L-5 42-99357 (Major Harold Bergmann, hospitalized).
Kennedy's L-5 accident was in 44-99282, still in service in 1952 according above website.
Regards,
Leendert