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9/27/01 12-38. PNEUMATIC GYROS. AC 43.13-1B CHG 1 when they are most needed, they may become unusable. (2) There are two sizes of venturi tubes: those which produce four inches of suction are used to drive the attitude gyros, and smaller tubes, which produce two inches of suction, are used for the turn and slip indicator. Some installations use two of the larger venturi tubes connected in parallel to the two attitude gyros, and the turn and slip indicator is connected to one of these instruments with a needle valve between them. A suction gage is temporarily connected to the turn and slip indicator, and the aircraft is flown so the needle valve can be adjusted to the required suction at the instru ment when the aircraft is operated at its cruise speed. (See figure 12-1.) a. Venturi Systems. The early gyro in struments were all operated by air flowing out of a jet over buckets cut into the periphery of the gyro rotor. A venturi was mounted on the outside of the aircraft to produce a low pres sure, or vacuum, which evacuated the instru ment case, and air flowed into the instrument through a paper filter and then through a noz zle onto the rotor. (1) Venturi systems have the advantage of being extremely simple and requiring no power from the engine, nor from any of the other aircraft systems; but they do have the disadvantage of being susceptible to ice, and FIGURE 12-1. Venturi system for providing airflow through gyro instruments. Par 12-38 Page 12-15PDF Image | AFS-640
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