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FLIGHT

Section 3221 - Orientation: True Fadeout System (Cont'd.)

9. It is sometimes true, when the 180 degree left turn is completed, that the plane is handed away from the Station as soon as the beam is regained. In some instances, when the turn is only partially made and the "on course" intercepted (Short Turn) the airplane will be headed towards the Station. HOWEVER, THIS RULE CANNOT BE DEPENDED UPON. IN the case of wide quadrants and scissor ranges, or in event of slow reaction to signal changes just at the start of the 180 degree turn, errors will be introduced that will prevent using this turn as a guiding factor in orientation. Wait until a compass course has been established on a beam by means of signal sound and then identify the beam by course and fade or build. Severe wind drift may make identification even by this means a little difficult unless definite fade or build is checked against position of "A" and "N" signals and course held. 

10. This system depends upon being able to obtain a fade or build in order to identify the beam as well as the quadrant. It is possible nevertheless th intersect an "on course" BEFORE flying long enough to prove the identity of the quadrant by a fadeout or build. In such cases this system will place the airplane on the beam in short order, since it is not an absolute requirement that the airplane be on a bisector heading exactly at the time of intersecting a beam. The series of alternate left and right  turns may be started from practically any course heading as long as a prompt reaction is made directly after crossing the "on course".

11. With a big airplane it is obviously undesirable to subject passenger to a continuous series of turns and for that reason the method is not used close to a Station where narrow beams would produce rapid signal changes and corrections. In such instances a Captain receiving rapid signal changes would revert to the Fadeout Parallel System and thus utilize the quadrant identification obtained from the Fade or Build but eliminate the turning features of the True Fadeout System.

6/20/39  
Flight