Title: Describe an aircraft's pneumatic system.
Course: Aircraft Pilot Training I (20053-I) > Section: Examining Aircraft Instruments, Components, Systems, and Performance

Description should include the following:

- In some aircraft, all the gyros are vacuum-, pressure-, or electrically operated.
- In other aircraft, vacuum or pressure systems provide the power for the heading and attitude indicators, while the electrical system provides the power for the turn coordinator.
- Most aircraft have at least two sources of power to ensure at least one source of bank information is available if one power source fails.

PLT338