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REGULATIONS FLIGHT Section 3261 VHF RECEIVERS PROCEDURES FOR VISUAL-AURAL RANGES 4. ORIENTATION: #1. Place receiver on proper channel, identify station. #2. Observe visual signal (Yellow or Blue). #3. Listen carefully and observe aural signal (A or N) #4. Identify quadrant by color and aural signal. #5. Proceed as follows: [[image]] Limit of max deflection BLUE N YELLOW N Position #1 Bi-Signal Zone Position #2 Bi-sectors like legs of range are always 90* apart. BLUE A Position #3 YELLOW A Position #1. Assume a heading parallel to the bi-sector. Fly this heading until either: (a) Visual indicator swings off limit stop indicating nearness to visual leg. At the middle position approximately 3 dots lead the needle with sufficient course correction to enter target range of indicator nearly on course, use regular bracketing procedure to station. Leave volume control sufficiently high to insure identification of position over station (reversal of aural signal). Some stations will have a Z marker installed. (b) The aural bi-signal is entered. Observe rate of approach to leg and avoid excessive course changes while bracketing aural course to station; course is very sharp. Observe visual signal change over station. Position #2. Assume bi-sector heading and intercept aural leg; proceed as in (b) above. Position #3. Assume bi-sector heading and intercept visual leg; proceed as in (a) above. 2/1/47 FLIGHT