AC 20-128A (PART-2, APPENDIX), ADVISORY CIRCULAR: DESIGN CONSIDERATIONS FOR MINIMIZING HAZARDS CAUSED BY UNCONTAINED TURBINE ENGINE AND AUXILIARY POWER UNIT ROTOR FAILURE (25-MAR-1997)
AC 20-128A (PART-2, APPENDIX), ADVISORY CIRCULAR: DESIGN CONSIDERATIONS FOR MINIMIZING HAZARDS CAUSED BY UNCONTAINED TURBINE ENGINE AND AUXILIARY POWER UNIT ROTOR FAILURE (25-MAR-1997).