If the OBS / LEG switch is in the OBS mode, the
pilots course setting knob will control the course for
the KLN 90B. The bottom MFD on the pilots side
provides the selected course to the KLN 90B when it is
in the OBS mode.
(9) Course Sync Button. The center push
button on the course source control is a CRS sync
button. Pressing the CRS sync (Direct-To) button for a
VOR (VHF Omni Range) course source sets the active
sources course to the sources bearing.
(10) CRS 1/2 Button. The CRS 1/2 button
toggles the selected navigation course (selected by
the Course Source Control) between #1 and #2.
(11) ARC Button. The center push button on
the mode selector is an ARC button. Pressing the
ARC button toggles the EHSI display.
1. HSI Mode. Full 360 compass rose or
HSI ARC 80 compass rose.
2. MAP Mode. Map 80 arc or Map full
(12) Range Selector. The inner knob on the
mode selector selects the range for displays where
range is applicable. Available ranges are 2.5, 5, 10,
20, 40, 80, 160, 320, and 640 nm. Range information
is stored in the control panel and defaults to the last
selected value at power up.
(13) MODE Selector. The MODE select knob
is a dual concentric knob with a center push button.
The outer knob allows you to select between HSI and
(14) ADI/PFD Button. The ADI / PFD button
on the display control panel toggles the display
between the basic EADI display and the Primary Flight
(15) Bearing Source Selector. The bearing
(BRG) button selects the navigation source to be
displayed on the EHSI bearing pointer. The aircraft
bearing selections are OFF, FMS 1, FMS 2, VOR 1,
TCN 1, VOR 2, ADF 1, and ADF 2. If a VOR
frequency is tuned on the pilots NAV receiver, the
source becomes VOR 1.
(16) Heading (HDG) Selector. The inner knob
of the data selector is used to position the heading
bug. When the heading knob is moved slowly, a
single click results in one degree heading changes. If
the knob is rotated quickly, the heading setting
changes numerous degrees per click.
(17) HDG SYNC Button. The center push
button on the data selector is a HDG SYNC selection.
Pressing the PUSH SYNC button will automatically
slew the selected heading bug to the lubber line.
When FMS 1 is the selected navigation source and the
PUSH button is pressed, the FMS heading bug is
displayed on the MFD and the navigation source label
FMS changes to FHDG. The FMS heading bug then
syncs to the selected heading.
(18) DATA Selector. The DATA select knob
is a dual concentric blind selector with a center push
button. The outer knob provides sequential selection
of FMS data to include Groundspeed (GS), True
Airspeed (TAS), Time To Go to next waypoint (TTG),
Elapsed Time (ET) from WOW, and off-no data
(CURSOR RST) button resets the cursor to the aircraft
a. Description. The EADI, Figure 3C-6, is an
instrument whose primary function is to display the
aircrafts current attitude. It combines the functions of
many electromechanical indicators into a single
electronic display. This display consists of the Attitude
Display Indicator (ADI) display page and the Primary
Flight Display (PFD). The default display format on
the EADI is the ADI format on powerup.
The ADI presents attitude, comparator warning
annunciations, decision height setting, and rate of turn
indicator. Other parameters that are displayed as a
function of pilot selection are DH annunciation, Radio
Altitude, Rising Runway, Vertical Deviation (GS or
VNAV), Speed Deviation, Flight Director Command
Bars (V Bars), Aircraft Symbol, Lateral Deviation,
Marker Beacons, Flight Director Annunciations, and
Course Source (Location (LOC), VOR, or FMS).
b. ADI Display Symbology.
(1) Pitch and roll attitudes are indicated by
the position of the blue sky and brown ground
relationship. The aircraft symbol is outlined in white
with a black interior. Precise pitch attitude is provided
by the position of the pitch scale with reference to the
nose of the aircraft symbol. Precise roll attitude is
provided by the position of the moving roll pointer with
reference to the roll scale. The pitch scale disappears
behind the roll pointer and the lateral deviation pointer
to prevent interference between the symbols. Roll is a
continuous 360 display and pitch is 90 display.