Sandel
Avionics
SN3308 Navigation Display
Installation Manual
90106-IM-G(4) Installation Manual W SIG.doc
Appendix-A Page 9
9: FCS
CHANGE
KING KI-525
DEFAULT
CURRENT
SIGNAL
DC
DC
HDG DATUM
+RIGHT
+RIGHT
CRS DATUM
+RIGHT
+RIGHT
HDG
V/DEG
00.550 00.550
CRS
V/DEG 00.210 00.210
MIN
VOLTS -09.997 -09.997
MAX
VOLTS
09.996 09.996
REF
VOLTS 00.001 00.001
Purpose
:
Trims the factory defaults for the emulation selected on page 8.
Instructions
:
HDG V/DEG and CRS V/DEG increase or decrease the gain of
the course or heading error relative to the lubber line, and
normally match the Volts/Degree input of the associated
autopilot computer. These values default when the FCS
selection is initially set, but can be adjusted in-flight if necessary,
in VFR conditions, as follows: (Note that prior to Software 1.33
these values were shown in arbitrary units, not in volts/deg).
a) Engage the autopilot in HDG mode. After the aircraft is
established on the desired heading, move the heading bug a
large amount and ensure that the aircraft turns to the heading
bug and rolls out normally without instability, overshooting or
undershooting the desired heading.
To correct for overshooting or instability, reduce the HDG
GAIN appropriately.
To correct for undershooting, increase the HDG V/DEG
appropriately.
b) Engage the autopilot in NAV mode and turn OFF the NAV
receiver to provide a zero course error. Repeat the tests and
adjustments in item ‘a’ above using the course pointer and
CRS V/DEG for adjustment.
c) Use the “offset” adjustment to center the heading rollout if not
precisely on the lubber line. This will rarely be required.
HDG DATUM and CRS DATUM allow the direction sensing to
be reversed during installation. Changing these settings is
identical to reversing H/C on a synchro control transformer.
