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) 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.
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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.
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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.
　
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