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be selected as soon as it switched to Nav mode.
If the heading source in use should fail, the FMS will automatically
switch to the next available source according to the priority list and
the appropriate message (IRS # HEADING FAIL, AHRS # HEADING
FAIL, or ANALOG HEADING FAIL) will become active on the
message page. The system will not, however, automatically switch
away from a heading source that has been manually selected, even
if that source should fail. Also, the system will never automatically
switch to either another FMS or the MAN heading input mode in
search of a valid heading source. These choices do not appear on
the automatic selection priority list above and must be manually
selected if desired. The pilot should check the HDG SRC (source)
menu for possible valid selections. The NO HEADING message will
become active whenever the system does not have a valid heading
input.
Section VII
Sensors & Interfaces
7-52 2423sv602
Change 1
Manual Heading Source Selection
A manually selected heading source will not be automatically
changed. To select a heading source:
1. Access DATA pages 4 (General Data) by repeatedly pressing
the DATA function key. The current HDG (heading) source is
listed in parentheses.
2. Access the HDG SRC page by using the [HDG] line select key
to position the cursor on the HDG entry field and then pressing
the LIST key.
3. Use the line select keys to select the desired heading source.
Manual Heading Input
In the unlikely event that all other heading sources have failed, the
following procedure may be used to manually enter a heading.
NOTE: In the event a Laser-type IRS must be selected to
ATTITUDE on the IRS Mode Selector Unit (MSU), the
heading for that unit can be manually set. Refer to
INERTIAL REFERENCE SENSORS (IRS), this section,
for the correct procedure.
1. Access DATA page 4 (General Data) by repeatedly pressing the
DATA function key. The current HDG (heading) source is listed
in parentheses.
2. Press the [HDG] line select key to position the cursor on the
HDG entry field.
3. Enter the desired heading. When the heading is entered, (MAN)
will be displayed to indicate that HDG is a manual input.
Section VII
Sensors & Interfaces
2423sv602 7-53
Change 1
MAGNETIC VARIATION
The VAR WARNING message is displayed when operating above
72 degrees 45 minutes north latitude or below 59 degrees 45
minutes south latitude. This message occurs 15 minutes latitude
prior to leaving the valid region for the magnetic variation model.
This gives the crew time to enter a manual variation or take other
action if operating an aircraft without a true heading source.
Manual Variation Input
1. Access DATA page 4 (General Data) by repeatedly pressing the
DATA function key.
2. Press the [VARIATION] line select key to position the cursor on
the VARIATION entry field.
3. Enter the desired variation. If required, use the ± key to change
the E/W prefix prior to making the entry. When the variation is
entered, (MAN) will be displayed to indicate that VARIATION is a
manual input.
Cancel Manual Variation Input
1. Access DATA page 4 (General Data) by repeatedly pressing the
DATA function key.
2. Press the [VARIATION] line select key to position the cursor on
the VARIATION entry field.
3. Press the BACK and then ENTER keys to cancel the manual
variation and to return to automatic computation of variation.
Section VII
Sensors & Interfaces
7-54 2423sv602
Change 1
RADAR/MFD INTERFACE
The FMS and RADAR/MFD interfaces have been accomplished in
such a manner that the FMS's flight plan waypoints and legs may be
selected for display on the weather radar display. When the FMS is
interfaced with Collins Pro Line 4 Avionics System, unique
operational differences exist which are discussed in the applicable
Pro Line 4 Supplement.
Radar Waypoints
With the mode selector switch on the RADAR/MFD control unit in the
Nav position, the "joystick" on the display unit may be used to
position the cursor to any point on the RADAR/MFD display where a
radar waypoint is desired. For example, a radar waypoint may be
desirable to the side of any on-course CB activity. Pressing the
ENTER key on the RADAR/MFD control unit will then define a radar
waypoint <R1> in the FMS. Up to 25 radar waypoints, <R1> thru
<R25>, may be defined.
Radar waypoints must be selected from a list, which is accessed
from either the Flight Plan page or the Direct to page by pressing the
LIST function key.
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