slave or the spin motor runs at less than 50 % usual speed. ) Selected course pointer. This shows the selected VOR radial or LOC course. ) To-From indicator. This shows the direction to the VOR station along the selected radial.
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AMM
Slaveing Meter
Slave and Free Gyro Switch
Clockwise/Counterclockwise
Adjustment
Figure 1: Bendix/King KA 51B Slaving Control Unit
NAV Warning Lubber Compass Flag Line Warning Flag
Heading
Select
Bug
Dual
Glideslope
Pointers
Symbolic
Aircraft
VOR and LOC Select Bar
Course
Select Knob
VOR/LOC Compass Deviation Scale Card
Course Select Pointer
To/From
Indicator
Glideslope
Deviation
Scale
Heading
Select
Knob
Figure 2: Bendix/King KI 525A Horizontal Situation Indicator
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Navigation
AMM
Trouble-Shooting
1. General
The table below lists the defects you could have with the compass system. Refer to Section 34-52 for trouble-shooting the localizer (LOC) and glideslope (GS) functions of the HSI.
If you have the trouble detailed in the Trouble column read across to the Possible Cause column. Then do the repair given in the Repair column.
Trouble Possible Cause Repair
Gyro compass does not operate. Circuit breaker not set. Indicator defective. Cables/connectors defective. Set the circuit breaker. Replace the indicator. Do a test for continuity on each cable. Do a test for short circuit to ground and between cables. Replace defective cables.
HSI heading flag appears The gyro on the KG 102A is Do a test for the correct
during normal operation (or running at less than 50 % of voltage at the KG 102A. If the
stays in view after start-up). the usual speed. The power supply in the KG 102A is defective. input voltage is correct, replace the KG 102A. Replace the KG 102A.
Continuous large deflection of the slaving meter. System operates correctly in free mode. Slaving system failed. Replace the magnetic azimuth transmitter KMT 112. If this does not clear the fault, do a test for continuity on each cable between the KMT 112 and the KG 102A. Do a test for short circuit to ground and between cables. Replace defective cables.
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AMM
Trouble Possible Cause Repair
Large differences between the magnetic compass and the gyro compass. Slaving system failed. Replace the magnetic azimuth transmitter KMT 112. If this does not clear the fault, do a test for continuity on each cable between the KMT 112 and the KG 102A. Do a test for short circuit to ground and between cables. Replace defective cables.
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Navigation
AMM
Maintenance Practices
1. General
This Section tells you how to remove/install the components of the compass system. It also tells you how to adjust the compass system.
2. Remove/Install the Slaved Directional Gyro
A. Remove the Slaved Directional Gyro
Detail Steps/Work Items Key Items/References
(1) Remove the passenger's seat. Refer to Section 25-10.
(2) Release the connector from the gyro.
(3) Remove the screws that attach the gyro to the mounting plate. Release the bonding cable from the gyro.
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