Viewing page 86 of 192

This transcription has been completed. Contact us with corrections.

REGULATIONS

FLIGHT

Section 3221 - Orientation" True Fadeout 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 th 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 buil in signal strength, This requires at least 2 minutes of flight, time 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 considerably more may be required to definitely establish a build or fadeout. This is sometimes true even within a few miles of the Station and has misled may 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. Continue bisector heading through "on course" until hearing the opposite signal, then immediately start a standard LEFT TURN, not to exceed 180°, until the beam (on course) is again intercepted.

6. Upon intercepting the beam, not the compass heading and make a continuous RIGHT turn until the "off course" signal is again heard. Keep this signal on the right to assist in keeping track of tights and lofts with relationship to the "A" of "N" signal, note the compass heading and make a continuous LEFT turn back to the "on course"

7. Continue bracketing the beam, noting the compass headings with each signal change and course change and eventually, after a short series of left and right alternate corrections, it will be possible to establish the required compass heading to hold the "on course" of the beam. It is necessary that course corrections be made by signal changes only and to react promptly. Do not follow compass headings and blindly ignore resulting signal changes.

8. AFTER beam has been bracketed and the course established, attempt to identify beam by the course heading with its relationship to a build or fade of signal volume. DO NOT ATTEMPT TO IDENTIFY BEAM before this time or by any other means as it will not be accurate IN ALL CASES.

6/20/39 
Flight