TM 1-1510-225-10 7-1 CHAPTER 7 PERFORMANCE DATA 7-1.  INTRODUCTION TO PERFORMANCE. The  graphs  and  tables  in  this  chapter  present performance   information   for   takeoff,   climb,   landing, and  flight  planning  at  various  parameters  of  weight, power, altitude, and temperature. Examples explaining appropriate use are provided for performance graphs. 7-2.  HOW TO USE GRAPHS. a.   All  airspeed  and  references  to  airspeeds  in this chapter are indicated airspeeds unless otherwise noted. b.  A   reference   line   indicates   where   to   begin following    the    guidelines.        Always    project    to    the reference  line  first,  then  follow  the  guidelines  to  the next    item    by    maintaining    the    same    proportional distance     between     the     guideline     above     and     the guideline below the projected line.  For instance, if the projected line intersects the  reference line in the ratio of  30%  down/70%  up  between  the  guidelines,  then maintain this same 30%/70% relationship between the guidelines all the way to the next item. c.   The Airspeed Calibration  - Normal System  – Takeoff  Ground  Roll  graph  was  used  to  obtain V₁ and V_r   Indicated   Airspeeds   (IAS).      All   other   indicated airspeeds    were    obtained    by    using    the    Airspeed Calibration - Normal System graph. d.  In   addition   to   presenting   the   answer   for   a particular  set  of  conditions,  the  example  on  a  graph also presents the order in which the various scales on the  graph  should  be  used.    For  instance,  if  the  first item in the example is Outside Air Temperature (OAT), then  enter  the  graph  at  the  known  OAT.    In  some cases, performance planning may require entering the chart at one point in order to establish a baseline and then  entering  the  chart  at  another  point  in  order  to obtain    the    answer.        Follow    the    sequence    of    the example, or establish the necessary baseline and then follow the sequence of the example. e.   The associated conditions define the specific conditions  from  which  performance  parameters  have been  determined.    They  are  not  intended  to  be  used as instructions; however, performance values determined  from  charts  can  be  achieved  only  if  the specified conditions exist. f.    Notes have  been  provided  on  various  graphs and tables to approximate performance with ice vanes extended.        The    effect    will    vary,    depending    upon airspeed, temperature, altitude, and ambient conditions.  At lower altitudes, where operation on the torque limit is possible, the effect of ice vane extension will be less, depending upon how much power can be recovered after the ice vanes have been extended. 7-3.  EXAMPLES. The following example presents the performance decision making process for correct flight planning and completion  of  the  Takeoff  and  Landing  Data  (TOLD) card.        Weather    conditions    for    the    departure    and destination airports are given to illustrate the impact on performance  planning  and  mission  capabilities.    The example mission is from Airport Alpha (AAA) to Airport Bravo  (BBB).    The  en  route  distance  is  700  nm.    The planned cruise altitude is FL240. a.     Conditions.   At Airport Alpha (AAA): OAT . . . . . . . . . . . . . . . . . . . . . . . . 85°F (+30°C) Field Elevation  . . . . . . . . . . . . . . . . . . .3800 feet Altimeter Setting. . . . . . . . . . . . . . . . 29.72 in. Hg Wind  . . . . . . . . . . . . . . . . . . . . .330° at 10 knots NOTE Do not use headwinds for takeoff performance planning. Runway 35 Length  . . . . . . . . . . . . . . . .6000 feet Weather  . . . . . . . . . . . . . . . . . .400 feet overcast Visibility . . . . . . . . . . . . . . . . . . .1 mile, rain/haze b.    Other  Than  Standard  Takeoff  Minimums and/or (Obstacle) Departure Procedures.   At Airport Alpha: Takeoff Minimums. . . . . . . . . . . . Rwy 35, 500-2* *Or  standard  with  minimum  climb  of  250/NM  to 5000.