TM 1-1510-223-10 8-2           Change 3 Section  II. OPERATING PROCEDURES AND MANEUVERS 8-5. OPERATING    PROCEDURES    AND    MANEU- VERS. This  section  deals  with  normal  procedures  and  in- cludes all steps necessary for safe and efficient opera- tion 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 taxing, 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 pre- ceding the check to which it is pertinent. The symbol (O) shall  be  used  to  indicated  “if  installed.”  Those  duties which are responsibility of the copilot, at the command of the pilot, will be indicated by a circle around the step num- ber, i.e.,  4.   Circuit Breakers — In. The star symbol in- dicates   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 ap- pear 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 proce- dure or maneuver is required. The condensed version of the amplified checklist is contained in the Operator’s and Crewmember’s  Checklist,  TM  1-1510-223-CL.  To  pro- vide for easier cross referencing, the procedural steps are numbered to coincide with the corresponding num- bered steps in this manual. 8-8. PREFLIGHT CHECK. The pilot’s walkaround and interior checks are out- lined 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 in- cluded. 8-9. BEFORE EXTERIOR CHECK. 1.   GPU — Connect as required. * 2.   Publications  —  Check  DA  Forms  2408-12, -13, -14, and -18, DD Form 365-4, locally re- quired forms and publications, and availability of operator’s manual (-10) and checklist (-CL). 3.   Oxygen system — Check that oxygen quantity is  sufficient  for  the  entire  mission,  that  crew masks operate normally, that the diluter selec- tor is set at 100%. 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 NOR- MAL. g.   FLOW indicator — Check. During inhala- tion  blinker  appears,  during  exhalation blinker disappears. Repeat a minimum of 3 times. h.   Oxygen masks — Remove and store. CAUTION If high or gusty winds are present, and the flight controls are unlocked, control surfaces may be damaged by buffeting. * 4.   Flight controls — Unlock and check. * 5.   PARKING BRAKE — Set. CAUTION The elevator trim system shall not be forced past the limits which are shown on the PITCH TRIM indicator scale. 6.   Elevator trim — Set to 0 (neutral).