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2. Turn and slip indicator - Wikipedia

   en.wikipedia.org/wiki/Turn_and_slip_indicator

   Thus one can now legally replace a Turn-and-Slip or Turn Coordinator instrument with a second attitude indicator, preferably driven by a system different from the primary flight display. So if the aircraft primary display is vacuum powered, the second attitude indicator should be electric, and vice-versa.

3. Attitude indicator - Wikipedia

   en.wikipedia.org/wiki/Attitude_indicator

   Vacuum system using a vacuum pump Vacuum system using a venturi. The heart of the AI is a gyroscope (gyro) that spins at high speed, from either an electric motor, or through the action of a stream of air pushing on rotor vanes placed along its periphery. The stream of air is provided by a vacuum system, driven by a vacuum pump, or a venturi.

4. Heading indicator - Wikipedia

   en.wikipedia.org/wiki/Heading_indicator

   The heading indicator is arranged such that the gyro axis is used to drive the display, which consists of a circular compass card calibrated in degrees. The gyroscope is spun either electrically, or using filtered air flow from a suction pump (sometimes a pressure pump in high altitude aircraft) driven from the aircraft's engine. Because the ...

5. Automobile accessory power - Wikipedia

   en.wikipedia.org/wiki/Automobile_accessory_power

   The most ubiquitous vacuum-powered accessory is the booster for the power brake system. The vacuum is only an assist and the brakes can still function, requiring greater force, if the booster vacuum is used up. Many older vehicles used vacuum-powered windshield wipers. Loss of manifold vacuum when the engine was working hard, or at wide open ...

6. Attitude and heading reference system - Wikipedia

   en.wikipedia.org/wiki/Attitude_and_heading...

   An attitude and heading reference system (AHRS) consists of sensors on three axes that provide attitude information for aircraft, including roll, pitch, and yaw.These are sometimes referred to as MARG (Magnetic, Angular Rate, and Gravity) [1] sensors and consist of either solid-state or microelectromechanical systems (MEMS) gyroscopes, accelerometers and magnetometers.

7. Horizontal situation indicator - Wikipedia

   en.wikipedia.org/wiki/Horizontal_situation_indicator

   Among other advantages, the HSI offers freedom from the confusion of reverse sensing on an instrument landing system localizer back course approach. As long as the needle is set to the localizer front course, the instrument will indicate whether to fly left or right, in either direction of travel.