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Power
Warning
Flag
Compass Card
Miniature Airplane
Knob
Figure 4: BF-Goodrich AIM2051BLD Directional Gyro
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C. Directional Gyro
(1) BF-Goodrich AIM2051BLD
Figure 4 shows the BF-Goodrich AIM2051BLD directional gyro. It is located in the left-hand % section of the instrument panel, see Chapter 31.
The directional gyro (DG) is an electrically-powered gyroscopic instrument. It operates when the main bus is powered and the DG circuit-breaker is closed. A warning flag shows when there is no power to the unit. The warning flag goes out of view when the DG has the correct power.
The directional gyro shows the direction of the airplane related to a preset heading. You set the heading by pushing and turning the knob on the face of the directional gyro. The display has a 360° compass card with 5° graduations.
% (2) Sigma-Tek 4000B-31
% Figure 5 shows the Sigma-Tek 4000B-31 directional gyro. It is located in the left-hand section % of the instrument panel, see Chapter 31.
% The Sigma-Tek directional gyro (DG) is only installed in the TAE version and is a vacuum % driven gyroscopic instrument. It operates when the engine is running. A suction gauge (refer % to Chapter 37) indicates when vacuum is applied to the unit. The suction gauge shows zero % when there is no vacuum to the unit.
% The directional gyro shows the direction of the airplane related to a preset heading. You set the % heading by pushing and turning the knob on the face of the directional gyro. The display has % a 360° compass card with 5° graduations.
Doc # 6.02.01 Page 5
Rev. 4 09 Jan 2003
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% % % Figure 5: Sigma-Tek 4000B-31 Directional Gyro
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Trouble-Shooting % 1. Electrical Gyro Instruments
% The table below lists the defects you could have with the integrated electrical gyro instruments. 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
Warning flag in view. Indication of instrument not reliable. Related circuit-breaker (T&B or HORIZON or DG) open or defective. Power supply wiring defective. Ground connection defective. Instrument defective. Close or replace the circuit-breaker. Do a test for the correct voltage at the instrument. Repair the power supply wiring/connector. Do a test for correct ground connection. Repair the ground wiring/connector. Replace the instrument.
Instrument is sluggish. Mechanism worn or dirty. Replace the instrument.
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% 2. Vacuum Driven Directional Gyro
% % % The table below lists the defects you could have with the integrated vacuum driven directional gyro. 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.
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Trouble Possible Cause Repair
Indication of instrument not reliable. Components of the vacuum system dirty or defective. Instrument defective. Refer to Chapter 37. Replace the instrument.
Instrument is sluggish. Mechanism worn or dirty. Replace the instrument.
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