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of the DIST and COURSE displays on the HSI and VNAV computer/controller
display can be controlled by the DIM knob.
(22) Radio Altitude Test Switch
When the radio altitude test (TEST RA) switch is pressed, a test
sequence is initiated on the RAD ALT and DH displays.
The RAD ALT display initially shows four eights (8888) during the
test, then changes to four dashes and finally changes to the test
altitude. The test altitude remains on the RAD ALT display until the
test switch is released and then the actual altitude is displayed.
The DH display initially shows three eights (888) during the test and
then reverts to the currently set DH value for the remainder of the
test.
The test sequence is inhibited after the ADI GS mode annunciator comes
on (APR CAP engage).
SECTION 4
Page 14
Oct 03/83
chanenqer
OPERATING MANUAL
(23) Decision Height Display
The three-digit incandescent DH display shows preselected decision
height between 0 and 990 feet as set by the DH SET knob. When the
aircraft is at or below the preselected decision height, the DH
annunciator lights come on to alert the pilot.
B. Horizontal Situation Indicator (Figure 4)
The horizontal situation indicator combines numerous inputs to provide a
map-like display of the aircraft position. The indicator displays aircraft
displacement relative to VOR radials, localizer, and glideslope beam.
Relative radio bearing is also displayed. The HSI is shown in Figure 4
(Sheet 1) and described in paragraphs (1) through (17).
For aircraft 1021 and subs,
The HSI is shown in Figure 4 (Sheet 2) and described in paragraphs (1)
through (22), except for paragraphs (12), (13) and (14) which are not
applicable.
(1) Aircraft Symbol
A fixed miniature aircraft symbol corresponds to the longitudinal axis
of the aircraft and lubber line markings. The symbol shows aircraft
position and heading with respect to the rotating heading dial. The
symbol also shows the aircraft position in relation to a radio course.
(2) Heading Dial
Displays gyro stabilized magnetic compass information on a dial which
rotates with the aircraft throught 360 degrees. The azimuth ring is
graduated in 5-degree increments. Fixed heading marks are at the fore
and aft lubber lines.
(3) Heading Bug
The notched orange heading bug is positioned on the rotating heading
dial by the remote heading knob to select and display preselected
compass heading. The bug rotates with the heading dial to indicate
that the difference between the bug and the forward lubber line index
is the amount of error applied to the flight director computer.
(4) Heading Flag
The HDG flag is in view when the heading signal from the directional
gyro becomes invalid, primary power to the ADI is lost, or the error
between the displayed heading and the received heading signal exceeds
8 + 2 degrees.
SECTION 4
Page 15
Oct 03/83
cacntiaadiiaeinr tjer
OPERATING MANUAL
DISTANCE
DISPLAY
COURSE
DISPLAY
VERTICAL MODE
ANNUIMICIATOR
COURSE
DEVIATION BAR
VERTICAL
WARNING FLAG
COURSE
.SELECT
POINTER
RNAV MODE
' ANNUNCIATOR
- TO FROM POINTER
(NAV MODE ANNUNCIATOR)
. ALERT ANNUNCIATOR
-AFT LUBBER USE
BEARING POINTER
ANNUNCIATOR
RECIPROCAL
COURSE
POINTER
BEARING SELECT
PUSHBUTTONS
EFFECTIVITY: A/C 1004 TO 1020
Horizontal Situation Indicator
Figure 4 (Sheet 1)
SECTION 4
Page 16
Oct 03/33
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OPERATING MANUAL
HEADING
DIAL
COURSE FORE TRUE HEADING
SELECT LUBBER HEADING WARNING
POINTER LINE ANNUNCIATOR FLAG
DISTANCE
DISPLAY
NAVIGATION
SOURCE
ANNUNCIATORS
WAYPOINT
ANNUNCIATOR
VERTICAL
DEVIATION
POINTER
VERTICAL
WARNING
FLAG
COURSE
DEVIATION
COURSE
DISPLAY
BEARING
POINTER
HEADING
BUG
BEARING
SELECT
PUSHBUTTON
NAVIGATION
WARNING FLAG
COMPASS
SYNC
ANNUNCIATOR
AIRCRAFT RECIPROCAL AFT RECIPROCAL TO-FROM
SYMBOL BEARING LUBBER COURSE ANNUNCIATOR
POINTER LINE POINTER
EFFECTIVITY: A/C 1021 & SUBS
Horizontal Situation Indicator
Figure 4 (Sheet 2)
SECTION 4
Page 17
Oct 03/83
chanenQer
OPERATING MANUAL
(5) Course Select Pointer
The yellow course pointer is positioned on the rotating heading dial
by the remote course knob to select a magnetic bearing that coincides
with the desired VOR radial or localizer course. The course pointer
　
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