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144 U.S. CIVIL AERONAUTICS AUTHORITY 90° TURNS FOR A LANDING During the early practice of landings the student will have been started on this type of approach but without the spot landing feature. He will have developed some proficiency in judging his glide along the back of the field to insure landing in the proper "lane," and the addition of a spot on this lane is merely another extension of the principles already learned. It is the easiest method of approaching a spot for an accuracy landing since the path may be varied by lengthening or shortening according to conditions as they develop, or [[image]] FIGURE 18. errors of judgement as they are perceived. It may also be varied slightly as explained before, with reference to its relative angle and distance from the back side of the field. This is the easiest method of developing the principles of flight path estimation, and the glide from the "key position" through the 90° turn to the spot is the final part of all accuracy landing maneuvers. From this beginning, other factors are gradually added, until the student is able to make use of the principles involved from practically any position where sufficient altitude will allow such an approach. When the student begins to show signs of comprehending the factors involved in judging his glide and final approach to the spot in this maneuver, he should be advanced to the next extension, the 180° U turn for a spot. All additional accuracy maneuvers will perfect the ability in the 90° approach, since it is the final portion of the more advanced maneuvers.