TM 1-1510-223-10 Change 3          1-1 CHAPTER 1 INTRODUCTION 1-1. GENERAL. These  instructions  are  for  use  by  the  operator(s). They apply to the RC-12N aircraft. 1-2. WARNINGS, CAUTIONS, AND NOTES. Warnings, cautions, and notes are used to emphasize important and critical instructions. Explanatory examples are as follows: 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. a.   This manual contains the best operating instruc- tions and procedures for the RC-12N aircraft under most circumstances.  The  observance  of  limitations,  perfor- mance, and weight/balance data provided is mandatory. The  observance  of  procedures  is  mandatory  except when modification is required because of multiple emer- gencies, adverse weather, terrain, etc. Your flying experi- ence is recognized, and therefore, basic flight principles are not included. THIS MANUAL SHALL BE CARRIED IN THE AIRCRAFT AT ALL TIMES. b.   The RC-12N is a pressurized, low wing, all metal aircraft and is powered by two turboprop engines. The basic mission of the aircraft is radio reconnaissance. 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,  titled  para- graphs, figures, and tables contained in this manual. 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 PRE- VENT ENEMY USE. For information concerning destruction of Army mate- riel to prevent enemy use, refer to TM 750-244-1-5. 1-9. FORMS AND RECORDS. Army aviators flight record and aircraft maintenance records which are to be used by crew members are pre- scribed  in  DA  PAM  738-751  and  weight  and  balance manual TM 55-1500-342-23. 1-10.   EXPLANATION OF CHANGE SYMBOLS. Except as noted in this paragraph, changes 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. Excep- tion: 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 minia- ture pointing hand symbol is used to denote a change to an illustration. However, a vertical line in the outer mar- gin, rather than miniature pointing hands, is utilized when there have been extensive changes made to an illustra- tion. Change symbols are not utilized to indicate changes in the following: a.   Introductory material. b.   Indexes and tabular data where the change cannot be identified. c.   Blank space resulting from the deletion of text, an illustration or a table. d.   Correction of minor inaccuracies, such as spelling, punctuation, relocation of material, etc., unless correc- tion changes the meaning of instructive information and procedures. 1-10.1    EFFECTIVITY CODES. The designator symbol   CA   is used throughout this manualtoidentifytext,illustrations,andperformancedata