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REGULATIONS
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FLIGHT
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[[underline]] Section 3211 - Orientation: 90-Degree System [[/underline]]

1. Tune in radio range signal and identify the Station being received by both the Station identification signal and the frequency dial setting. Determine type of signal being received, - that is, pure "A", pure "N" or bisignal indication.

2. From the radio range chart determine the two bisector headings which are at RIGHT ANGLES to the bisectors of the quadrant the airplane is now in. In other words, if the airplane is in an "N" quandrant select the "A" bisectors as the course to be considered.

3. Observe the present course heading of the airplane and use the direction of the above chosen bisectors which is closest to the present heading. In that way the desired course can be reached with the minimum amount of turn and the problem started in the shortest possible time. (Certain types of terrain may make this procedure inadvisable due to higher obstructions such as mountains, large bodies of water or congested areas. In such cases pilots generally fly bisector heading in only one direction to avoid the interference or fly away from it, thus a great margin of altitude clearance is obtained.) Make a turn to the required bisector heading and fly it. While flying this bisector heading it should be noted that two of the beams of the Station have been eliminated from the problem thus far, due to the direction of the flight relative to the bisectors and quadrants. Thus only [[underline]] two possible beams [[/underline]] remain, [[underline]] one [[/underline]] of which will be intercepted.

4. Determine whether the airplane is approaching or leaving a beam by the SIGNAL CHANGE. If the airplane is leaving a [[underline]] bisignal zone [[/underline]], make a 180 degree left or right turn and fly the reciprocal heading toward the beam. (This is to avoid crossing an open quadrant.)

5. Continue this heading toward the beam and through the "on course" until the [[underline]] first [[/underline]] "off course" indication on the far side of the beam has been received.

6. Upon crossing the beam make a [[underline]] 90-degree Right Turn [[/underline]]. This new course will be one of the bisector headings. Find it on the chart [[underline]] before [[/underline]] making the turn, so that the new required heading will be determined in advance and confusi8on or mental calculation eliminated at the moment of making the turn.

7. Make certain the airplane is [[underline]] leaving [[/underline]] a beam on this new heading. In 50% of the cases the beam will be crossed twice before definitely leaving it. In the other 50% of the cases the beam will only be crossed once at this point. Care must be exercised here as drift, severe cases, might result in misleading signal changes. By definitely determining that the airplane is [[underline]] leaving [[/underline]] a beam after completing the 90-degree turn this possibility of drift error will be eliminated. 

6/20/39                 Flight