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Section 34-25
Integrated Gyro Instruments
1. General
This Section tells you about the instruments which show attitude and flight direction and which have integrated gyros. These are:
) Turn and bank indicator.
) Attitude gyro (horizon).
) Directional gyro.
Refer to Section 34-28 for the remote-gyro compass system. Refer to the manufacturer's manuals for more data about the integrated gyro instruments.
2. Description and Operation
A. Turn and Bank Indicator
Figure 1 shows the turn and bank indicator Electric Gyro Corp. 1394T100-(3Z). It is located in the % left-hand section of the instrument panel, see Chapter 31.
The turn and bank indicator is an electrically-powered gyroscopic instrument. It operates when the main bus is powered and the T&B 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 turn and bank indicator has the correct power.
The turn and bank indicator shows the rate of rotation of the airplane about the vertical axis. The turn and bank indicator has markings for rate 2 turns.
The turn and bank indicator has a slip indicator. A ball in a curved tube filled with fluid shows when the airplane is slipping or skidding. When the ball is in the center, the turn is correctly coordinated.
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Figure 1: Electric Gyro Corp. 1394T100-(3Z) Turn and Bank Indicator
Rotating Roll
Scale
Fixed Roll Index
Horizon Line
Power Warning Flag Display Miniature Airplane
Caging Knob
Airplane
Adjustment
Knob
Figure 2: BF-Goodrich AIM 1100-28L(0F) DIA Attitude Gyro
Rotating Roll
Scale
Fixed Roll Index
Horizon Line
Power Warning Flag Display Miniature Airplane
Caging Knob
Figure 3: BF-Goodrich AIM 1100-28LK(0F) DIA Attitude Gyro (28 Volts) % BF-Goodrich AIM 1100-14(5) DIA Attitude Gyro (14 Volts)
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B. Attitude Gyro (Artificial Horizon)
Figure 2 shows the BF-Goodrich AIM 1100-28L(0F) DIA attitude gyro. It is only approved for VFR operation.
Figure 3 shows the BF-Goodrich AIM 1100-28LK(0F) DIA attitude gyro. It is approved for VFR and
% IFR operation. The BF-Goodrich AIM 1100-14(5) DIA attitude gyro is identical to the AIM 1100-
% 28LK(0F) DIA (Figure 3), except that it operates on 14 V.
% The attitude gyro is located in the left-hand section of the instrument panel, see Chapter 31.
The attitude gyro is an electrically-powered gyroscopic instrument. It operates when the essential bus is powered and the HORIZON circuit-breaker is closed. It can also receive power from the emergency battery, see Section 24-32. A warning flag shows when there is no power to the unit. The warning flag goes out of view when the turn and bank indicator 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.
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