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% The warning flag goes out of view when the Attitude Gyro has the correct power.
The indicator shows pitch and roll data. The display shows a blue area for the sky and a brown area
for the ground. A miniature airplane represents the airplane's nose and wings. Horizontal markings
above and below the horizon show pitch up and down. Each graduation is 5°.
The roll display has markings around the circumference of the instrument. The markings are at 10,
20, 30, 60 and 90 degrees of roll.
The attitude gyro has these controls:
) PULL TO CAGE knob (manual erection). When pulled, rotated and released in the detent
position, it locks roll and pitch gimbals in caged position.
Note: The AIM 1100-28LK(0F) DIA or AIM 1100-14(5) DIA attitude gyro has a
guard to prevent unintended caging of the attitude indicator (see Figure 3).
This guard is not part of the attitude indicator unit.
CAUTION: THE INDICATOR MAY BE DAMAGED IF THE 'PULL TO CAGE' KNOB IS
RELEASED WITH A 'SNAP'. RELEASE 'PULL TO CAGE' KNOB
AVOIDING A 'SNAP' RELEASE.
) Airplane adjustment knob. Only the AIM 1100-28L(0F) DIA has this knob, see Figure 2. Turning
the knob moves the miniature airplane up and down a minimum of ± 4° relative to the middle
position.
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 4
20 Sep 2007 34-25-00 Doc # 6.02.01
Rev. 5
Figure 4: BF-Goodrich AIM2051BLD Directional Gyro
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-25-00 Page 5
20 Sep 2007
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.
% (3) Sigma-Tek 4000C-17
% Figure 6 shows the Sigma-Tek 4000C-17 directional gyro, It is located in the left-hand section
% of the instrument panel, see Section 31-11.
% The Sigma-Tek directional gyro (DG) is only installed in the DA 40 D 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 an indication outside
% of the green and white arc when there is no vacuum applied 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. The directional gyro additionally provides heading
% information for the autopilot system.
%
AIRCRAFT
Navigation
DA 40 Series
AMM
Page 6
20 Sep 2007 34-25-00 Doc # 6.02.01
Rev. 5
Figure 5: Sigma-Tek 4000B-31 Directional Gyro
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% Figure 6: Sigma-Tek 4000C-17 Directional Gyro
AIRCRAFT
DA 40 Series
AMM
Navigation
Doc # 6.02.01
Rev. 5 34-25-00 Page 101
20 Sep 2007
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.
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