BENDIX/KING
KCS 55/55A
Rev 11, Apr/2007
©Honeywell International Inc. Do not print without express permission of Honeywell
Page 2-7
4.
Place the aircraft on a West heading and center the com-
pass card West under the lubber line with the manual slave
buttons. Place a non-magnetic blade screwdriver in the E/
W potentiometer on the KA 51/KA 51A and adjust the exter-
nal millivolt meter for 1/2 of the existing meter readout.
As a final check of the KCS 55/KCS 55A System, the aircraft should be positioned
on the compass rose and turned to each of the four cardinal headings while the
KCS 55/KCS 55A System in the "Slaved Gyro" mode. All readings should be within
±
2
o
of those on the compass rose.
Next with the aircraft on a North heading and the KCS 55/KCS 55A System turned
off but all other aircraft systems still on, adjust the KA 51/KA 51A indicator move-
ment via the adjustment in the upper rear of the indicator to zero the slaving indi-
cator. The KA 51/KA 51A can now be reassembled in the aircraft; the alignment is
complete.
2.8.7
KA 52 AND KA 57
NOTE:
The autopilot operation must be confirmed as correct
before the following adjustments are attempted. If
possible, check the autopilot components alignment
on the bench.
Take off the KA 52/57 dust cover by removing the two screws on the side of the unit. The HDG
and CRS potentiometers at the left rear of the printed circuit board (viewing the board from the
connector end) provide the gain adjustments for the course and heading modes of operation. The
following is a procedure for setting the gains for the Mitchell Century II and III autopilots. The vari-
ations in the procedure for setting the gains in other autopilots are given at the end of each section.
NOTE:
On the KA 57 R108, the HDG select gain adjust is lo-
cated near the outside edge of the board. R109, the
CRS datum gain adjust is located toward the center
of the board. On KA 52’s, the adjustments are
marked accordingly.
HDG: With the autopilot off, manually adjust the attitude gyro for +10
o
of offset (the atti-
tude gyro artificial horizon rotated 10
o
counterclockwise from its 0
o
position). Turn
on the autopilot and set it in the Heading mode (Radio Coupler selector switch set
to Heading) and position the KI 525 Heading Select Marker for +10
o
of offset (Mark-
er 10
o
clockwise from lubber line). Adjust the HDG potentiometer until there is no
movement of the control wheel. Check the gain setting by repositioning the control
wheel to the center of its range and observing that there is no movement either
clockwise or counterclockwise.
Next, turn off the autopilot and reposition the attitude gyro for -10
o
of offset (the at-
titude gyro artificial horizon rotated 10
o
clockwise from its 0
o
position). Turn on the
autopilot and slew the Heading Select Marker to -10
o
(Marker 10
o
counterclock-
wise from the lubber line).
RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
UP536434
