TM 1-1510-218-10 7-6 Decreasing the load and/or fuel. Reducing takeoff weight and using flaps 40%. Delaying    the    departure    for    more    favorable weather conditions. (10)   V1 (Takeoff Decision Speed) / V_r (Rotation Speed).  In the C-12 aircraft V1 and V_r are always the same speed.  Use the tabular data table at the top of Figure  7-18,  Take-Off  Distance,  Flaps  0%  or  Figure 7-21, Take-Off Distance, Flaps 40%. The   takeoff   configuration   for   this   example   is Flaps 0%.  The V1/V_r speed is 103 KIAS. Enter  the  speed,  103  KIAS,  in  the  appropriate block on the TOLD card. (11)   V2 / V_yse.  Use the tabular data table at the top of Figure 7-27. Climb – One Engine Inoperative. In accordance with the ATM, flaps are retracted just after liftoff at 105 KIAS for both a normal takeoff and in the event  of  an  engine  failure  after  V₁.    The  V₂/V_yse  - KNOTS,  Figure  7-27,  is  V_yse  and  is  essentially  the same  speed  as  V₂  for  a  takeoff  with  flaps  at  0%. Consequently, V₂ flaps 0% and V_yse are used as the V₂ speed  for  entry  on  the  TOLD  card.    V2  /  V_yse  for  a 12,400 pound aircraft is 121 KIAS. Enter the speed in the appropriate  block on the TOLD card. (11A) If    conducting    an    obstacle    clearance climb,   use   the   “Vx”   speed   from   the   TAKEOFF DISTANCE – FLAPS APPROACH chart. (12)   Climb   Gradient   Altitude.      This   is   the altitude to which the single engine climb gradient must be  continued  as  specified  in  the  applicable  DP.    The information is advisory and intended as a reminder to the crew of the altitude to which they must climb at V2 / V_yse in order to clear obstacles. For  this  example,  the  DP  specified  climbing  to 5000 feet MSL. Enter  the  altitude,  5000  feet,  in  the  appropriate block on the TOLD card. NOTE Items 13 through 17 are initially calculated at  takeoff  weight  as  a  contingency  for  a necessary return to the takeoff airport right after  departure.    The  items  must  be  re- calculated for the arrival at the destination. (13)   Runway  Length  Available.    This  is  the runway length available for landing. For this example, the runway length is 6000 feet and    there    is    no    displaced    threshold    or    other information  limiting  the  useful  landing  distance  of  the runway. Enter  the  length,  6000  feet,  in  the  appropriate block on the TOLD card. (14)   Landing  Weight.    For  the  takeoff  TOLD card, landing  and takeoff weights are  the  same.    For arrival  at  the  destination  the  TOLD  card  must  be  re- calculated  to  reflect  actual  aircraft  weight  and  airport conditions. For  this  example,  takeoff  and  landing  weight  is 12,400 pounds. Enter    the    weight,    12,400    pounds,    in    the appropriate block on the TOLD card. (15)   V_ref Speed.  This speed is 1.3 times V_so at the   intended   landing   weight   if   the   landing   will   be accomplished   using   Flaps   DOWN   (100%).      If   the landing will be accomplished with the Flaps at 40%, or any  setting  greater  than  APPROACH  but  less  than 100%,  then  V_ref  is  1.3  times  V_s1  (the  stall  speed  for FLAPS 40%).  Use Figure 7-9, Stall Speeds – Power Idle to determine applicable stall speeds. For  this  example,  the  landing  weight  (assuming an   emergency   return   to   the   departure   airport)   is 12,400   pounds   a   landing   with   the   Flaps   DOWN (100%) is planned.  The V_so for a 12,400 pound aircraft is  74.8  KIAS.    Therefore,  V_ref  is  1.3  times  75  =  97.5 and is rounded up to 98 KIAS. There is another method to determine V_ref when the   landing   will   be   accomplished   with   the   Flaps DOWN.      Subtract   5   KIAS   from   the   APPROACH SPEED ~ KNOTS obtained from the tabular data table at  the  top  of  Figure  7-30,  Landing  Distance  Without Propeller Reversing, Flaps 100%.  For a 12,400 pound aircraft the given APPROACH  SPEED is  103  KIAS  – 5 KIAS = 98 KIAS. As another example, if the landing was planned using   the   Flaps   at    APPROACH   (40%),   or   any intermediate setting short of DOWN (100%), then the V_ref   speed   would   be   1.3   times   V_s1   (the   FLAPS APPROACH  stall  speed).    FLAPS  APPROACH  stall speed   for   a   12,400   pound   aircraft   is   84.8   KIAS. Therefore, the V_ref speed is 1.3 times 85 = 110.5 and is rounded up to 111 KIAS.