T-34C INSTRUMENTS CHG 1
The IND350 shows the aircraft's actual course of flight in relation to a selected course. The
selected course is set with the OBS knob. The course deviation indicator (vertical bar) will be
centered if the aircraft is actually on the selected course. For an off course condition the bar will be
displaced to one side or the other. The TOFROM indicator shows whether the selected course, if
flown, will take you TO or FROM the station. The VOR/TACAN switch enables the pilot to select
VOR or TACAN information for display on the CDI. The IND350 provides an immediate and
simple presentation of course deviation and is an excellent reference for maintaining desired course.
Its use is highly recommended for tracking along airways or on approaches. If both the IND350
and the RMI are operating and a course discrepancy is noted between them, the RMI indication is
more reliable. (See Figure 47 for an illustration of the IND350)
Figure 4-7 IND-350
With a VOR frequency selected in the VOR and the IND350 selected to the "VOR" position, each
"mark" indicates 2º of deviation with a full scale deflection of + 10º from CDI centerline. With an
ILS/Localizer frequency selected in the VOR and the IND350 selected to the "VOR" position, each
"mark" indicates 1/2º of deviation with a full scale deflection of + 2½º from CDI centerline.
If there is a discrepancy between the RMI and CDI needles, rely on
the RMI needle.
4-10 INTRODUCTION TO RADIO INSTRUMENTS