TM 1-1510-225-10 B-3 Reverse Thrust The   region   of   the   POWER   lever control  that  is  aft  of  the  Beta  and GROUND  FINE  range  and  controls engine    power    through     GROUND FINE and  REVERSE range. RPM Revolutions Per Minute SHP Shaft horsepower.  The horsepower imparted to the propeller shaft. Static Power     The  power  which  must  be  available for takeoff without exceeding engine limitations. Takeoff Power The    maximum    power    permissible for a takeoff. B-4.  CONTROL AND INSTRUMENT TERMINOLOGY CONDITION Lever (Fuel Shut-off Lever) The   fuel   shut-off   lever   actuates  a valve   in   the   fuel   control   unit   that controls  the  flow  of  fuel  at  the  fuel control    outlet    and    regulates    the IDLE range from LOW to HIGH. N₁ Tachometer (Gas Generator RPM) The  tachometer  registers  the  RPM of    the    gas    generator    with    100% representing a gas generator speed of 37,500 RPM. POWER Lever (Gas Generator N₁ RPM) The POWER lever serves to modulate    engine    power    from    full reverse     thrust     to     takeoff.          The position    for    IDLE    represents    the lowest recommended level of power for flight operation. Propeller Control Lever (N₂ RPM) The propeller control lever is used to control     the     RPM     setting     of     the propeller   governor.      Movement   of the  lever  results  in  an  increase  of decrease in propeller RPM. Propeller  feathering  is  the  result  of lever movement beyond the detents at  the  low  RPM  (high  pitch)  end  of the lever travel. Propeller Governor The propeller governor senses changes  in  RPM  and  hydraulically changes   propeller   blade   angle   to compensate     for     the     changes     in RPM.      Constant   propeller   RPM   is thereby  maintained  at  the  selected RPM setting. Torque- meter The torquemeter system determines the    shaft    output    torque.        Torque values  are  obtained  by  tapping  into two   outlets   on   the   reduction   gear case  and  recording  the  differential pressure from the outlets. Interstage Turbine Temperature (ITT) The temperature of the gases present    between    the    compressor turbine and power turbine. B-5.  GRAPH AND TABULAR TERMINOLOGY AGL Above ground level Best Angle- of-Climb The best angle-of-climb speed is the airspeed   that   delivers  the  greatest gain     of     altitude     in     the     shortest possible     horizontal     distance     with gear and Flaps up. Best Rate- of-Climb The  best  rate-of-climb  speed  is  the airspeed  that  delivers  the  greatest gain     of     altitude     in     the     shortest possible time with gear and flaps up. Clean Configu- ration Gear and FLAPS UP. Demon- strated Crosswind The maximum 90 crosswind component for which adequate control  of  the  aircraft  during  takeoff and landing was actually demonstrated during certification tests. Gradient The ratio   of the change in height to the horizontal distance, usually expressed in percent. Landing Weight The  weight  of  the  aircraft  at  landing touchdown. Maximum Zero Fuel Weight Any  weight  above  the  value  given must be loaded as fuel. MEA Minimum Enroute Altitude Ramp Weight The    gross    weight    of    the    aircraft before engine start.  Included is the takeoff  weight  plus  a  fuel  allowance for   start,   taxi,   run-up   and   take-off ground roll to lift-off. Route Segment A  part  of  a  route.    Each  end  of  that part   is   identified   by   a   geographic location or a point at which a definite radio fix can be established.