TM 55-1510-222-10 Section II.  OPERATING PROCEDURES AND MANEUVERS 8-5.  OPERATING PROCEDURES AND MANEUVERS. This section deals with normal procedures and includes all  steps  necessary  for  safe  and  efficient  operation  of the  aircraft  from  the  time  a  preflight  begins  until  the flight    is    completed    and    the    aircraft    is    parked    and secured.    Unique  feel,  characteristics,  and  reaction  of the aircraft during various phases of operation, and the techniques   and   procedures   used   for   taxiing,   takeoff, climb,  etc.,  are  described,  including  precautions  to  be observed.        Only    the    duties    of    the    minimum    crew necessary  for  the  actual  operation  of  the  aircraft  are included.  For operation of avionics equipment, refer to the   operating   handbooks   that   accompany   the   aircraft loose tools. 8-6.  SYMBOLS DEFINITION. Items  which  apply  only  to  night  or  only  to  instrument flying  shall  have  an  N  or  I  respectively,  immediately preceding the check to which it is pertinent. The symbol O  shall  be  used  to  indicate  "if  installed."  Those  duties which    are    the    responsibility    of    the    copilot,    at    the command of the pilot, will be indicated by a circle ( 0 ) around  the  step  number,  i.e.,  (4).    Circuit  breakers  In. The star symbol indicates that an operational check is required.        The    asterisk    symbol indicates    that performance  of  a  step  is  mandatory  for  all  thru-flights. The  asterisk  applies  only  to  checks  performed  prior  to takeoff.  Placarded items appear in upper case. 8-7.  CHECKLIST. Normal procedures are given primarily in checklist form and    are    amplified    as    necessary    in    accompanying paragraph    form    when    a    detailed    description    of    a procedure   or   maneuver   is   required.      The   condensed version  of  the  amplified  checklist  is  contained  in  the Operator's  and  Crewmember's  Checklist,  TM  55-1510- 222-CL.    To  provide  for  easier  cross  referencing,  the procedural   steps   are   numbered   to   coincide   with   the corresponding numbered steps in this manual. 8-8.  PREFLIGHT CHECK. The pilot's walk around and interior checks are outlined in  the  following  procedures.    The  preflight  check  is  not intended  to  be  a  detailed  mechanical  inspection.    The steps  that  are  essential  for  safe  aircraft  operation  are included. 8-9.  BEFORE EXTERIOR CHECK. * 1. Publications Check DA Forms 2408-12, -13, -14, and -18, DD Form 365-4, locally required forms and publications,  and  availability  of  operator's  manual  (-10) and checklist (-CL). 2. Oxygen system Check that oxygen quantity is sufficient for entire mission, that crew masks operate normally,  and  that  the  diluter  selector  is  set  at  100%. Refer to Chapter 5 for oxygen requirements. a. Oxygen supply pressure gages Check b. Supply control lever (green) ON. c. Diluter control lever 100% OXYGEN d. Emergency   control   lever   (red)   Set   to   TEST MASK position while holding mask directly away from face, then return to NORMAL. e. Oxygen mask Put on and adjust. f. Emergency  pressure  control  lever  Set  to  TEST MASK  position  and  check  mask  for  leaks,  then  return lever to NORMAL. g. Flow indicator Check.  During inhalation blinker appears, during exhalation blinker disappears.  Repeat a minimum of 3 times. h. Oxygen masks Remove and store. * 3. Flight controls Unlock and checked. * 4. Parking brake Set. CAUTION The elevator trim system shall not be forced    past    the    limits    which    are shown on the elevator trim indicator scale. 5. Elevator trim Set to 0 (neutral). CAUTION Do not cycle landing gear handle on the ground. * 6. GearDN. * 7. Keylock switch ON. 8-2