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RELEASED FOR THE EXCLUSIVE USE BY: AIRCRAFT ELECTRONICS ASSOCIATION
BENDIX/KING
INSTRUMENT AND GYRO REPAIR MUST BE
ACCOMPLISHED BY A HONEYWELL AP-
PROVED INSTRUMENT SERVICE CENTER.
WARRANTY IS VALID ONLY WHEN THE
DUST COVER SEAL IS IN CONTACT.
2.8.6
ALTERNATE METHOD OF COMPENSATION ADJUSTMENTS FOR KMT 112
AND KA 51/KA 51A
The small slaving indicator in the KA 51/KA 51A, although shielded, is still susceptible, to magnetic
and electrical interference occurring in and around the aircraft instrument panel. This interference,
depending upon the KA 51/KA 51A's location in the instrument panel, can cause an observable
indicator needle offset in the compass system during power on and/or power off conditions. The
following adjustment procedures should be used to align the compass system more accurately.
Remove the KA 51/KA 51A from its housing and connect a digital millivolt meter to the rear of the
slaving indicator, black wire to the common and red wire to the positive connection of the millivolt
meter.
A.
KMT 112 Alignment
With the complete KCS 55/KCS 55A System operating and synchronized, position
the aircraft on a compass rose and turn it to each of the four cardinal headings.
Place the KA 51/KA 51A in the "Free Gyro" mode and zero the external millivolt
meter with the manual slave buttons on the KA 51/KA 51A at each of these head-
ings. Record the error, as a signed number, e.g. (-4), between the compass rose
and heading on the KI 525/KI 525A. Add the errors algebraically and divide by four
to obtain the index error. Loosen the mounting screws on the KMT 112 and rotate
the unit an amount equal and opposite to the index error to cancel out the index
error. Retighten the mounting screws.
B.
KA 51/KA 51A Adjustment
With the complete KCS 55/KCS 55A System operating and the KA 51/KA 51A in
the "Free Gyro" mode; position the aircraft on a compass rose and adjust the com-
pensation as follows:
1.
2.
3.
Page 2-6
©Honeywell International Inc. Do not print without express permission of Honeywell
CAUTION:
Place the aircraft on a North heading and center the com-
pass card North under the lubber line with the manual slave
buttons. Place a non-magnetic blade screwdriver in the N/
S potentiometer on the KA 51/KA 51A and zero the external
±
millivolt meter. (0VDC
Place the aircraft on an East heading and center the com-
pass card East 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 zero the external
±
millivolt meter. (0VDC
Place the aircraft on a South heading and center the com-
pass card South under the lubber line with the manual slave
buttons. Place a non-magnetic blade screwdriver in the N/
S potentiometer on the KA 51/KA 51A and adjust the exter-
nal millivolt meter for 1/2 of the existing meter readout.
50mV)
50mV)
KCS 55/55A
Rev 11, Apr/2007
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