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REGULATIONS FLIGHT Section 3241 - Orientation: Fadeout Parallel System 1. Tune in radio range signal and identify station being received by both the station identification signals and the frequency dial setting. Determine type of signal being received; that is, pure "A", pure "N" or bisignal indication. Having decided on signal being received, fly a course parallel to the bisector of the quadrant the plane is in and closest to the initial heading (unless terrain influences this direction). 2. Tune down the volume to a minimum signal to determine a fade or build in signal strength. This requires at least 2 minutes of flight, timed on a clock. If a fadeout is received make a 180 degree turn either left or right and fly the reciprocal course of this bisector heading. Check for a buildup in volume to confirm the direction of the Station as being ahead. (Frequently as much as 10 minutes or considerable more may be required to definitely establish a build or fadeout. This is sometimes true even withina few miles of the Station and has misled many experienced instrument pilots.) 3. Identify the quadrant from the buildup or fade relative to the bisector heading being flown. 4. Continue to fly the bisector heading until the beam is intercepted. This beam will be one of the two and only two beams that can be intercepted by flying this bisector heading in this quadrant. 5. Upon reaching a beam, assume a course heading PARALLEL TO THE UNDESIRED BEAM at the moment of entering the "on course". 6. At this point one of two things will happen. The plane will either remain "on course" (or very close to it) and continue to receive a buildup of volume, OR will go "off course" very rapidly into an open quadrant, with a rapid signal change. 7. If the plane remains "on course" (or very close to it) the beam has been identified as being the one which is parallel to the present heading. If the plane goes "off course" very rapidly into an open quadrant, with a rapid signal change, the desired beam has been intercepted and the plane is headed away from it. 8. In case number one merely adjust the course heading to properly bracket the beam and continue towards the Station. In the second case make a turn away from the Station, (unless signals have changed slowly to indicate that the position is a considerable distance from the Station, having also reckoned the wind) and assume either the recriprocal of the present course, or a bisector heading that will carry the plane back into the beam required. The bisector of the quadrant will most generally be adequate to regain the beam from such a position, but this depends upon the amount of "off course" indication being received. 6-20-30 Flight