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2. Description and Operation
The Bendix/King KCS 55A slaved remote-gyro-compass system (gyro-compass system) can be
installed in the DA 40. The data from the gyro compass is supplied to the horizontal situation indicator
(HSI). The gyro-compass system has these components:
) Slaved directional gyro KG 102A.
) Magnetic azimuth transmitter ('flux valve') KMT 112.
) Slaving control unit KA 51B.
) Horizontal situation indicator (HSI) KI 525A.
A. Slaved Directional Gyro
The slaved directional gyro is located under the baggage compartment on the right side. The gyro
supplies heading information to the HSI. The gyro has an internal power supply which gives
excitation voltages to the magnetic azimuth transmitter. It also gives positive and negative voltages
to the HSI and slaving control unit. The gyro can be set to operate in SLAVE mode or FREE mode.
If you set the gyro to SLAVE mode, then the gyro aligns with the magnetic direction reference
signal from the magnetic azimuth transmitter. At first the alignment occurs at a slew rate of 180
degrees per minute. After this time it will align at the ‘usual' rate of 3 degrees per minute. The
alignment continues at this rate while in slave mode.
The pilot can select FREE mode to disengage the magnetic reference direction signal. The pilot
can change the heading information by operating the clockwise/counter-clockwise toggle-switch
on the slaving control unit.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 2
20 Sep 2007 34-28-00 Doc # 6.02.01
Rev. 5
B. Magnetic Azimuth Transmitter
The magnetic azimuth transmitter (also known as the 'flux valve') senses the direction of the earth's
magnetic field and sends the data to the slaved directional gyro. The transmitter is located in the
right wing.
C. Slaving Control Unit
Figure 1 shows the slaving control unit. It is located in the right-hand section of the instrument
panel, see Chapter 31.
The control unit contains the circuitry that compensates for the local magnetic disturbances which
may effect the azimuth transmitter.
The control unit has a toggle switch that can be set to SLAVE or FREE and a sprung toggle switch
that can be set momentarily to clockwise (CW) or counter-clockwise (CCW). It also has an indicator
that shows the amount of error between the sensed reference signal from the azimuth transmitter
and the alignment of the slaved directional gyro.
The Slave/Free toggle switch puts the slaved directional gyro into either Slave or Free mode.
When the directional gyro is in FREE mode, the pilot can use the CW/CCW sprung toggle switch
to manually set heading information in the pilot's display.
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-28-00 Page 3
20 Sep 2007
D. Horizontal Situation Indicator
Figure 2 shows the horizontal situation indicator (HSI). The HSI is located in the left-hand section
of the instrument panel, see Chapter 31. It has the following features:
) Compass card. This rotating card shows gyro-stabilized magnetic compass data below the
lubber line.
) Heading select knob. This sets the heading select marker relative to the compass card.
) Symbolic airplane. This shows the relationship of the airplane to the display.
) Reciprocal course pointer. This shows the reciprocal of the selected course.
) Course select knob. This sets the selected course pointer in relation to the compass card.
) Lateral deviation bar. This shows VOR radial or LOC course. When related to the symbolic
airplane, the position of the deviation bar is the same as the position of the chosen VOR radial
or LOC course to the airplane.
Note: The lateral deviation bar normally shows information which it receives from the
NAV 1 receiver. When the GPS annunciation control unit is installed, the lateral
deviation bar can also show information which it receives from the GPS receiver.
Refer to Section 34-58 for details about the GPS annunciation control unit.
) Glideslope pointer. Represents the actual airplane deviation from the glideslope path. When
unusable glideslope data is present, the glideslope pointer moves out of view. When there is a
valid glideslope signal, the pointers come into view after a 2 to 12 second delay.
) Heading select. This indicates the selected airplane heading.
) NAV warning flag. The warning flag is in view when the VOR/LOC data is unusable.
) Lubber line. Read the airplane magnetic heading under this line.
) Heading warning flag. The warning flag is in view when low power, manual slave, fast auto slave
or the spin motor runs at less than 50 % usual speed.
) Selected course pointer. This shows the selected VOR radial or LOC course.
　
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