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REGULATIONS
FLIGHT
Section 3261.                            VHF RECEIVERS 
 
1. Flight on 1-101C Indicator
    The use of the 1-101C indicator on the BC-733-D receiver allows the pilot an improved method of accurate flight path control, reputedly much freer from interference due to static or distraction due to other necessary aural signals.
   This is now available on 6 frequencies U, V, W, X, Y and Z for localizer use and U, V, W, for the few VHF ranges in our present receivers.
   There are two manners of flight practice both easily understood.
   The usage of 1-101C indicator target, as in the SGS-51 localizer system, where a round circle is considered as the permissible limit of deviation from course.
   The target is considered as the aircraft and for inbound flights on localizer the target and aircraft are moved toward needles at all times. (Both localizer and glide-path.)
   The blue sector of the localizer leg is always on the right side inbound when making an approach, On outbound flights through the localizer, as in missed approach procedure, the localizer needle continues to indicate in the same manner. 
   On opposite courses, i.e., 224[degrees] on LG, the indicator needle gives the reverse correction, but is always in the correct color quadrant. In this case you must fly away from the needle. At all times, care must be taken to avoid excessive course changes.

2. VHF- Visual Aural Ranges
   For VHF range flying it is only necessary to use the vertical needle, and with reference to the range chart determine on which side the color quadrants lie. The needle always points to the correct color quadrant.
   As there are two other signals given aurally, attention must be given to the identification signal which, as in LF ranges identify the stations and the usual A and N signals which are now always in 180 [degrees] sectors. Bi-signal zones at comfortable volume levels, are quite sharp and relatively narrow.
   The aural on course is approximately 2 and 1/2[degrees] wide so descent and flight by this path is practical. The visual course is somewhat wider on VHF ranges however, so attention to fairly close on course indications should be made. This should result in as accurate a path as the aural HF range when flown closely. As an automatic volume control feature is installed in this receiver, very little change of signal volume (fade-buildup) will be noticed as compared with HF ranges where signal volume changes are a basic part of procedure practices.

2/1/47.                                      FLIGHT