TM 1-1510-225-10 5-15 (d)  Flight   Duration.      All   missions   with over  12,500  pounds  GTOW  shall  have  a  minimum duration of 60 minutes unless restricted by Air Traffic Control (ATC), turbulence, other weather conditions, or emergencies. (e)  Takeoff.  All takeoffs with over 12,500 pounds GTOW shall be accomplished from a smooth, paved runway.  Takeoffs shall not be performed with a tailwind. (2)  Maximum Weight Operation. (a)  Takeoff.      Maximum   gross   takeoff weight is 14,000 pounds. (b)  Landing.      Maximum   gross   landing weight is 12,500 pounds. (c)  Maximum  Ramp  Weight.    Maximum ramp weight is 14,090 pounds. (d)  Maximum Zero Fuel Weight. Maximum zero fuel weight is 11,000 pounds. 5-19.  CABIN AIRSTAIR DOOR WEIGHT LIMITATION. The maximum weight that may be placed on the steps of the cabin airstair door is 300 pounds. 5-20.  TOILET WEIGHT LIMITATION. The maximum weight of a person occupying the toilet   during   takeoff   or   landing   shall   not   exceed 238 pounds. Section V.  AIRSPEED LIMITS, MAXIMUM AND MINIMUM 5-21.  AIRSPEED LIMITATIONS. All  placarded  airspeeds  and  airspeed  indicator readings contained in procedures, text, and illustrations   throughout   this   Operator's   Manual   are given  as  Indicated  Airspeed  (IAS)  unless  otherwise noted. 5-22.  MAXIMUM ALLOWABLE AIRSPEED. The  maximum  allowable  airspeed  is  259  KIAS below 11,500 feet, and M_mo of 0.52 Mach as indicated by   the   maximum   allowable   airspeed   pointer   (red striped) between 11,500 feet and 35,000 feet. 5-23.  LANDING GEAR EXTENSION/EXTENDED SPEED. The airspeed limit for extending the landing gear and   for   flight   with   the   landing   gear   extended   is 181 KIAS. 5-24.  LANDING GEAR RETRACTION SPEED. The airspeed limit for retracting the landing gear is 163 KIAS. 5-25.  WING FLAP EXTENSION SPEEDS. The  airspeed  limit  for  APPROACH  extension, 40%, of the wing flaps is 200 KIAS.  The airspeed limit for  flap  positions  beyond  APPROACH  is  157  KIAS (V_fe)_.   If wing flaps are extended above these speeds, the   flaps   or   their   operating   mechanisms   may   be damaged. 5-26.  MINIMUM SINGLE ENGINE CONTROL AIRSPEED (V_mca). The   minimum   single   engine   control   airspeed (V_mca) at sea level standard conditions is 86 KIAS. 5-27.  MAXIMUM DESIGN MANEUVERING SPEED. The   maximum   design   maneuvering   speed   is 181 KIAS. 5-28.  TIRE LIMITATION. a.  Tire    limitation    for    high    flotation    gear    is 139 knots (160 mph). b.  Standard  Gear.    Tire  limitation  for  standard gear is 156 knots (180 mph). Section VI.  MANEUVERING LIMITS 5-29.  MANEUVERS. a.  The following maneuvers are prohibited. (1)  Spins. (2)  Aerobatics of any kind. (3)  Abrupt maneuvers above 181 KIAS.