TM 55-1510-219-10 CHAPTER 1 INTRODUCTION 1-1.  GENERAL. These instructions are for use by the operator(s).  They apply to the RC-12D aircraft. 1-2.  WARNINGS, CAUTIONS, AND NOTES. Warnings,    cautions,    and    notes    are    used    to emphasize  important  and  critical  instructions  and  are used for the following conditions: WARNING An operating procedure, practice, etc. , which  if  not  correctly  followed,  could result in personal injury or loss of life. CAUTION An  operating  procedure,  practice,  etc. , which, if not strictly observed, could result  in  damage  to  or  destruction  of equipment. NOTE An    operating    procedure,    condition, etc.  , which is essential to highlight. 1-3.  DESCRIPTION. This manual contains the best operating instructions   and   procedures   for   the   RC-12D   aircraft under     most     circumstances.          The     observance     of limitations, performance, and weight/balance data provided  is  mandatory.    The  observance  of  procedures is    mandatory    except    when    modification    is    required because   of   multiple   emergencies,   adverse   weather, terrain,  etc.    Your  flying  experience  is  recognized,  and therefore  basic  flight  principles  are  not  included.   THIS MANUAL SHALL BE CARRIED IN THE AIRCRAFT AT ALL TIMES. 1-4.  APPENDIX A, REFERENCES. Appendix A is a listing of official publications cited within  the  manual  applicable  to  and  available  for  flight crews. 1-5.  APPENDIX B, ABBREVIATIONS AND TERMS. Appendix B is a listing of abbreviations and terms used throughout the manual. 1-6.  INDEX. The  index  lists,  in  alphabetical  order,  every  titled paragraph,  figure,  and  table  contained  in  this  manual. Chapter  7,  Performance  Data,  has  an  additional  index within the chapter. 1-7.  ARMY AVIATION SAFETY PROGRAM. Reports    necessary    to    comply    with    the    safety program are prescribed in AR 385-40. 1-8.        DESTRUCTION    OF    ARMY    MATERIEL    TO PREVENT ENEMY USE. For   information   concerning   destruction   of   Army materiel to prevent enemy use, refer to TM 750-2441-5. 1-9.  FORMS AND RECORDS. Army aviators flight record and aircraft maintenance   records   which   are   to   be   used   by   crew members  are  prescribed  in  DA  PAM  738-751  and  TM 55-1500-342-23. 1-10.  EXPLANATION OF CHANGE SYMBOLS. Changes,  except  as  noted  below,  to  the  text  and tables,   including   new   material   on   added   pages,   are indicated by a vertical line in the outer margin extending close    to    the    entire    area    of    the    material    affected; exception:      pages   with   emergency   markings,   which consist of black diagonal lines around three edges, may have the vertical line or change symbol placed along the inner margins.  Symbols show current changes only.  A miniature   pointing   hand   symbol   is   used   to   denote   a change to an illustration.  However, a vertical line in the outer  margin,  rather  than  miniature  pointing  hands,  is utilized when there have been extensive changes made to  an  illustration.    Change  symbols  are  not  utilized  to indicate changes in the following: 1-1