36 Close throttle establish 1.4 V$_{SO}$ Lower partial flaps maintain  1.4 V$_{SO}$ Lower full flaps (as needed) establish 1.3 V$_{SO}$ 45° Base key position Power reduced base leg speed 36 18 90° Close throttle, normal glide speed Medium or steeper bank Downwind leg key position Key position Lower partial flaps, maintain 1.4 V$_{SO}$ Lower full flaps (as needed), establish 1.3V$_{SO}$ Figure 8-27.  180° power-off approach. Figure 8-26.  90° power-off approach. The 180° power-off approach requires more planning and  judgment than the 90° power-off approach. In the execution  of 180° power-off approaches, the airplane is flown on a  downwind heading parallel to the landing runway. The  altitude from which this type of approach is started varies  with the type of airplane, but should usually not exceed  1,000 feet above the ground, except with large airplanes.  Greater accuracy in judgment and maneuvering is required  at higher altitudes. 8-24