The question that should be asked is the qualifications of both pilots. Both were very young and with little experience.  To assume fault lies with the flight school's maintenance of these two planes is premature at best. For all we know, the first pilot that crashed in Moanalua may have caused the plane to go down by turning the engine off inadvertently with no time to or ability to restart the engine.  The pilot who died was not experienced in flying in Hawaii and was relatively new as well.  Flying at the end of the day and in to the night is a very dangerous time.  Just look at the deaths of John Kennedy and Gary Galiher.  Both of them had significantly more experience and flying time, but made fatal mistakes.  Accidents do happen and pilots do make errors.