TM 1-1510-224-10 NOTE Use of these graphs for flight conditions  other  than  14,000  pounds gross weight may introduce errors. (a) Cruise   speeds.      Enter   the   Normal Cruise  Speeds  at  1500  RPM  graph  at  25,000  feet,  and read the true airspeeds for ISA -6C and ISA +5C: Cruise True Air Speed (ISA -6C)..............262 KTAS Cruise True Air Speed (ISA +5C).............254 KTAS (b) Cruise    power    setting.        Enter    the Normal Cruise Power at 1500 RPM graph at 25,000 feet, and  read  the  recommended  torque  settings  for  ISA  -6C (-34C IFAT) and ISA +5C (-25C IFAT): ISA -6C (-350C IFAT) .......... 70% torque per engine ISA +50C (-250C IFAT) ......... 63% torque per engine NOTE For  flight  planning,  enter  the  Cruise Power    graphs    at    the    forecast    ISA condition; for enroute power settings, enter the graphs at the actual IFAT. (c) Cruise   fuel   flow.      Enter   the   Fuel Flow  At  Normal  Cruise  Power  at  1500  RPM  graph  at 25,000  feet,  and  read  the  fuel  flow  for  ISA  -6C  IFAT) and ISA +5C (-24C IFAT): ISA -6C (-35C IFAT) Fuel Flow Per Engine...................... 392 lbs/hr Total Fuel Flow .................................. 784 lbs/hr ISA +5C (-24C IFAT) Fuel Flow Per Engine...................... 359 lbs/hr Total Fuel Flow ............................... 718 lbs/hr Time  and  fuel  used  were  calculated  at  normal cruise power at 1500 RPM as follows: Time = distance/ground speed Fuel used = (time)(total fuel flow) (7) Flight planning results.    Refer  to  table  7-3 for an example of the flight planning procedure. NOTE For   flight   planning,   enter   the   Fuel Flow    graphs    at    the    forecast    ISA condition; for enroute fuel flow, enter the graphs at the actual IFAT. Refer  to  table  7-4  for  an  example  of  the  total flight planning results. (a) Reserve  fuel.    Reserve  Fuel  is  the amount  of  fuel  required  to  fly  at  cruise  altitude  for  45 minutes    at    maximum    range    power.        This    example assumes  the  average  cruise  weight  while  using  reserve fuel to be 15,000 pounds. Enter  the  Maximum  Range  Power  at  1500  RPM tables  for  ISA  and  for  ISA  +10C  and  interpolate  to  find the  total  fuel  flow  for  25,000  feet  at  16,000  pounds  and 14,000   pounds.      Interpolate   between   these   values   for 15,000 Table 7-3.  Example Cruise Results ROUTE SEGMENT ¹DISTANCE NM ESTIMATED GROUND SPEED KNOTS ²TIME AT CRUISE ALTITUDE MIN ³FUEL USED FOR CRUISE LBS BIL-SHR 43 278 9.3 120.34 SHR-CZI 57 318 10.8 139.5 CZI-CPR 20 279 4.3 51.3 TOTAL 120 --- 24.4 311.14 1 Distance required to climb or descend has been subtracted from segment distance. 2 Time =Distance divided by Ground Speed. 3 Fuel Used =Distance divided by Ground Speed, multiplied by total Fuel Flow. BT05790 7-15