1 3 2 4 Spanwise flow of boundary layer develops at high C$_{L}$ Initial flow separation at or near tip Area of tip stall enlarges Stall area progresses inboard acceleration is to pitch the nose downwards and use gravity.  As such, several thousand feet or more of altitude loss may be  needed to recover completely. The above discussion covers  most airplanes; however, the stall recovery procedures for  a particular make and model airplane may differ slightly,  as recommended by the manufacturer, and are contained in  the FAA-approved Airplane Flight Manual for that airplane. is indicated by aural stall warning devices or activation of  the airplane’s stick shaker. Stick shakers normally activate  around 107 percent of the actual stall speed. In response to  a stall warning, the proper action is for the pilot to apply a  nose-down input until the stall warning stops (pitch trim may  be necessary). Then, the wings are rolled level, followed  by adjusting thrust to return to normal flight. The elapsed  time will be small between these actions, particularly at  low altitude where a significant available thrust exists. It is  important to understand that reducing AOA eliminates the  stall, but applying thrust will allow the descent to be stopped  once the wing is flying again. To the pilot transitioning into jet airplanes, going faster is  seldom a problem. It is getting the airplane to slow down  that seems to cause the most difficulty. This is because of the  extremely clean aerodynamic design and fast momentum of  the jet airplane and because the jet lacks the propeller drag  effects that the pilot has been accustomed to. Additionally,  even with the power reduced to flight idle, the jet engine still  produces thrust, and deceleration of the jet airplane is a slow  process. Jet airplanes have a glide performance that is double  that of piston-powered airplanes, and jet pilots often cannot  At high altitudes the stall recovery technique is the same. A  pilot will need to reduce the AOA by lowering the nose until  the stall warning stops. However, after the AOA has been  reduced to where the wing is again developing efficient lift, the  airplane will still likely need to accelerate to a desired airspeed.  At high altitudes where the available thrust is significantly  less than at lower altitudes, the only way to achieve that  15-14 Drag Devices Figure 15-16.  Sweptwing stall characteristics.