Textron 172R180HP, Pilot Operating Handbook

Page: 381 / 396

CESSNA
MODEL 172R
SECTION 9 - SUPPLEMENTS
SUPPLEMENT 13 - FAA APPROVED
6. TO/FROM INDICATOR -- Indicates direction of VOA station
relative to the selected course. Displays TO when a LOC
frequency is selected.
7. DUAL GLIDE SLOPE POINTERS -- Displays deviation of
airplane from an ILS glideslope. Full scale deflection of the
glideslope pointers represents ± 0. 7 degrees. Pointers will be
out of view if an invalid glideslope signal is received.
8. GLIDE SLOPE SCALES -- Indicates displacement from glide
slope beam center. A glide slope deviation bar displacement
of 2 dots represents full-scale (0.7
°
) deviation above or below
glide slope beam centerline.
9. HEADING SELECTOR KNOB (Q )-- Positions the heading
bug on compass card by rotating the heading selector knob.
The bug rotates with the compass card.
10. COMPASS CARD -- Rotates to display heading of airplane
with reference to lubber line on HSI.
11. COURSE SELECTOR KNOB
(t
)-- Positions the course
bearing pointer on the compass card by rotating the course
selector knob.
12. COURSE DEVIATION BAR (D-BAR) - The center portion of
the omni bearing pointer moves laterally to pictorially indicate
the relationship of airplane to the selected course. It indicates
degrees of angular displacement from VOA radials and
localizer beams, or displacement in nautical miles from GPS
desired course.
13. COURSE DEVIATION SCALE -- A course deviation bar
displacement of 5 dots represents full scale (VOA = ± 10 °,
LOC
=
± 2-1/2
°
, GPS
=
5nm enroute, GPS APR
=
.3nm)
deviation from beam centerline.
14. HEADING BUG -- Moved by �) knob to select desired
heading.
15. SYMBOLIC AIRCRAFT -- Provides pictorial presentation of the
airplane position and intercept angle relative to selected VOR
Radial or localizer course.
Figure 1. Horizontal Situation Indicator System (Sheet 2 of 2)
Jan 15/99
S13-5