TM 1-1510-225-10 B-2 V_so Stalling     speed     or     the     minimum steady  flight  speed  in  the  landing configuration. V_sse The    safe    one-engine    inoperative speed selected to provide a reasonable margin against the occurrence  of  an  unintentional  stall when     making     intentional     engine cuts. V_yse The best single-engine rate-of-climb speed is the airspeed which delivers the  greatest  gain  of  altitude  in  the shortest    possible    time    with    one engine  inoperative,  gear  and  flaps up. B-2.  METEOROLOGICAL TERMINOLOGY Altimeter Setting Barometric    pressure    corrected    to sea level. C Degrees Celsius. F Degrees Fahrenheit. FAT Free  air  temperature  is  the  free  air static   temperature,   obtained   either from ground meteorological sources or from in-flight temperature indications adjusted for compressibility effects. Indicated Pressure Altitude The  number  actually  read  from  an altimeter when the barometric scale (Kollsman  window)  has  been  set  to 29.92     inches     of     mercury     (1013 millibars). ISA International  Standard  Atmosphere in which: The air is a dry perfect gas. The   temperature   at   sea   level   is 59 F, 15 C. The pressure at sea level is 29.92 inches Hg. The temperature gradient is -0.003566  F per foot from sea level to the altitude at which the temperature   is      –69.7   F,   and  0 above that altitude. Pressure Altitude Indicated pressure altitude corrected for altimeter error. SL Sea level. Wind The    wind    velocities    recorded    as variables    on    the    charts    of    this manual are to be understood as the headwind or tailwind components of the  actual  winds  at  50  feet  above runway surface (tower winds). B-3.  POWER TERMINOLOGY Beta Range The   region   of   the   POWER   lever control which  is aft of the  IDLE stop and    forward    of    reversing    range where    blade    pitch    angle    can    be changed without changing gas generator speed. Cruise Climb    The  maximum  power  approved  for normal climb.  This power is torque or temperature (ITT) limited. GROUND FINE The   region   of   the   POWER   lever control, which is aft of the IDLE stop and   forward   of    REVERSE   range, where   propeller   blade   pitch   angle and    gas    generator    RPM    can    be changed. Use to provide deceleration  on  the  ground  during landing accelerate-stop conditions. HIGH IDLE The    region    of    CONDITION   lever control placarded as the  HIGH IDLE position.        This    limits    the    power operation  to  a  minimum  of  70%  of N₁ RPM. LOW IDLE The    region    of    CONDITION   lever control placarded as the  LOW IDLE position.        This    limits    the    power operation  to  a  minimum  of  62%  of N₁ RPM. Maximum Cruise Power The  highest  power  rating  for  cruise that is not time limited. Maximum Continuous Power The maximum power available from an engine for use during an emergency operation. Normal Rated  Climb Power The maximum power available from an    engine    for    continuous    normal climb operations. Normal Rated Power The maximum power available from an  engine  for  continuous  operation in  cruise  (with  lower  ITT  limit  than normal rated climb power).