TM 1-1510-224-10 V_s Power off stalling speed or Pressure Altitude Indicated pressure altitude the minimum steady flight corrected for altimeter error. speed at which the aircraft is controllable. SL Sea level. V_so Stalling speed or the mini- Wind The wind velocities recorded mum steady flight speed in as variables n the charts of the landing configuration. this manual are to be under- stood as the headwind or tail- V_ssc The safe one-engine inoperative wind components of the speed selected to provide actual winds at 50 feet above a reasonable margin against runway surface (tower the occurrence of an unintentional winds). stall when making intentional engine cuts. B-3.  POWER TERMINOLOGY. V_yse The best single-engine rate of Cruise Climb Is the maximum power climb speed. approved for normal climb. This power is torque or B-2.  METEOROLOGICAL TERMINOLOGY. temperature (TGT) limited. Altimeter Setting Barometric pressure corrected Ground Fine The region of the power lever to sea level. control which is aft of the idle stop and forward of reversing C Degrees Celsius range where blade pitch angle F Degrees Fahrenheit. and gas generator RPM can be changed. FAT Free air temperature is the free air static temperature, High Idle Obtained by placing the obtained either from ground condition lever in the HIGH meteorological sources or IDLE position. From in-flight temperature Low Idle Obtained by placing the indications adjusted for com- condition lever in the LOW IDLE pressibility effects. position. Indicated Pressure Alti-   The number actually read Maximum Cruise Power Is the highest power rating for tude from an altimeter when, the cruise and is not time limited. barometric scale (Kollsman window) has been set to Maximum Power The maximum power avail- 29.92 inches of mercury able from an engine for use (1013 millibars). during an emergency operation. ISA International Standard Atmo- sphere in which: Normal Rated Climb The maximum power avail- Power able from an engine for a. The air is a dry perfect gas. continuous normal climb operations. b. The temperature at sea level is 59 degrees Fahrenheit, 15 degrees Celsius. Normal Rated Power The maximum power avail- able from an engine for c. The pressure at sea level is 29.92 inches Hg. continuous operation in cruise d. The temperature gradient from sea level to the (with lower TGT limit than altitude at which the temperature is -69.7 degrees normal rated climb power). is -0.003566 Fahrenheit per foot and zero Reverse Thrust Obtained by lifting the power Fahrenheit above that altitude. levers and moving them aft of the beta range. B-2