Slaving Meter (Ka 51B); Kmt 112 Magnetic Slaving Transmitter; Kg 102A Directional Gyro - Honeywell Bendix/King KFC 225 Pilot's Manual

KCS 55A Compass System
Compass Warning Flag - A red flag
labeled "HDG" becomes visible in
the upper right quadrant of the dis-
play whenever the electrical power is
inadequate or the directional gyro is
not up to speed. Compass failures
can occur which will not be annunci-
ated by the "HDG" flag. Therefore,
periodic comparison with the
standby compass is advised.
NAV Warning Flag - A red flag
labeled "NAV" becomes visible in the
upper left quadrant of the display
whenever a usable signal is not
being received.

Slaving Meter (KA 51B)

This meter indicates any differ-
ence between the displayed heading
and the magnetic heading. Right or
up deflection indicates a clockwise
error of the compass card. Left or
down deflection indicates a counter-
clockwise error of the compass card.
Whenever the aircraft is in a turn and
the card rotates, it is normal for this
meter to show a full deflection to one
side or another.
NOTE: During level flight it is normal
for the meter needle to continuously
move from side to side and to be
fully deflected during a turn. If the
needle stays fully deflected, left or
right, during level flight, the free gyro
mode can be used to center it, as
follows:
30
KFC 225 AUTOMATIC FLIGHT CONTROL SYSTEM
+
AUTO MAN
CCW CW
KA 51B Slaving Meter
Slave and Free Gyro Switch - When
the switch is in the AUTO position,
the system is in the slaved gyro
mode. When the switch is in the
MAN position, the system is in the
free gyro mode.
Clockwise Adjustment - When the
system is in the free gyro mode,
holding the manual heading switch
to the CW position will rotate the
compass card to the right to elimi-
nate left compass card error.
Counterclockwise Adjustment -
When the system is in the free gyro
mode, holding the manual heading
switch to the CW position will rotate
the compass card to the left to elimi-
nate right compass card error.
The KA 51B Slaving Control
and Compensator Unit is a small
slaving accessory which can be
used in installations where panel
space is limited. The KA 51B can be
mounted either vertically or horizon-
tally.
Rev. 0
Apr/99
KMT 112 Magnetic Slaving
Transmitter
This unit senses the direction of
the earth's magnetic field and contin-
uously transmits this information
through the slaving circuitry to the
directional gyro which is automati-
cally corrected for precession or
"drift". This sensor is mounted
remotely – usually in a wingtip – to
eliminate the possibility of magnetic
interference.

KG 102A Directional Gyro

The directional gyro provides
gyro stabilization for the system and
contains the slaving circuitry neces-
sary for operation of the system.
Power may be for either 14 or 28
volts DC. This sensor is also remote
mounted.
Operating Instructions
1. Until power is applied to the
KCS 55A System, and the direc-
tional gyro is up to speed, a red
flag labeled "HDG" will be visible
in the upper right quadrant of the
KI 525A Indicator. In operation,
this warning flag will be visible
whenever the power being sup-
plied is inadequate or the gyro is
not up to speed.
2. With the application of power to
the KCS 55A System, and gyro up
to operating speed, the red "HDG"
flag should disappear from view.
Rev. 0
KFC 225 AUTOMATIC FLIGHT CONTROL SYSTEM
Apr/99
KCS 55A Compass System
KMT 112 Magnetic Slaving
Transmitter
KG 102A Directional Gyro
3. If the KCS 55A System is in the
slaved gyro mode, the compass
card will automatically fast slave at
the rate of 180 degrees per minute
toward the aircraft's magnetic
heading. (Immediately after apply-
ing power, this compass card
movement should be quite visi-
ble.) It will continue to fast slave
until the proper magnetic heading
is indicated, after which it will
slave at a constant rate of three
degrees per minute to keep the
system aligned with the earth's
magnetic field.
31