TM 1-1510-223-10 Change 3        B-3 Reverse Thrust Obtained by lifting the power levers and moving them aft of the beta 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     limita- tions. Takeoff Power The maximum power avail- able from an engine for take- off, limited to periods of five minutes duration. B-4.   CONTROL AND INSTRUMENT TERMINOLOGY. Condition Lever (Fuel Shut-off Lever) The fuel shut-off lever actu- ates a valve in the fuel con- trol  unit  which  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 genera- tor with 100% representing a gas    generator    speed    of 37,500 RPM. Power Lever (Gas Generator N₁ RPM) This  lever  serves  to  modu- late  engine  power  from  full reverse thrust to takeoff. The position  for  idle  represents the    lowest    recommended level of power for flight op- eration. Propeller Control Lever ^(N2 RPM) This lever requests the con- trol to maintain RPM at a se- lected value and in the maxi- mum  decrease  RPM  posi- tion, feathers the propeller. Propeller Governor This Governor will maintain the selected propeller speed requested  by  the  propeller control lever. Torquemeter 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 dif- ferential  pressure  from  the outlets. Turbine Gas Tempera- ture (TGT) Two   gages   on   the   instru- ment panel indicate the tem- perature between the com- pressor and power turbines. B-5.   GRAPH AND TABULAR TERMINOLOGY. AGL Above ground level. Best Angle of Climb The best angle-of-climb speed is the airspeed which delivers the greatest gain of altitude in the shortest pos- sible horizontal distance with gear and flaps up. Best Rate of Climb The best rate-of-climb speed is the airspeed which delivers the greatest gain of altitude in the shortest pos- sible time with gear and flaps up. Clean Configuration Gear and flaps up. Demonstrated Cross- wind The   maximum   90   cross- wind  component  for  which adequate control of the air- craft during takeoff and land- ing    was    actually    demon- strated   during   certification tests. Gradient The  ratio  of  the  change  in height to the horizontal dis- tance, 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 air- craft before engine start. In- cluded is the takeoff weight plus   a   fuel   allowance   for start, taxi, run-up and take- off ground roll to lift-off.