It is obvious from the response-mode definitions in Appendix A that none of the described
vehicle failures can be considered as a Mode 1, 2, or 3 response, or a Mode-4 on-trajectory
failure.• Except possibly for (2), it also seems apparent that none can be modeled as either a
rapid tumble or a slow tum.




• Although prompt destruct action during any of the described flights might have resulted in a Mode-4
  classification, the safety officer typically needs several seconds to evaluate data after a malfunction.
  Quick action is contrary to safety philosophy if impact limit lines are not threatened and the destruct •
  system is not at risk, since additional flight time enhances the user's opportunity to pinpoint the
  nature of the problem.


9/10/96                                            5                                                 RTI