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Aviation Glossary :: System 1  Aviation Glossary :: System 1 FAA Written Test Preparation
Aviation Glossary Welcome to the Dauntless Aviation Glossary!

At Dauntless, our editorial staff maintains the web's largest unified glossary of aviation terms. This glossary is built from a combination of official, quasi-official, and proprietary sources (including original material that we develop oursselves). Uniquely, we often provide multiple definitions of a given term so that you can find that which best applies to you. In order to maximize your learning efficiency, this glossary (and similar ones for our international users) is incresingly fully integrated into our aviation learning apps, including our FAA written test prep and FAA practical test prep software and apps. If you like this glossary, you'll love them with their polished learning environments and world's best and clearest content (please do give them a try.).

System 1
System 1
System 1 refers to the fact that nearly all systems are ‘duplexed’, i.e. there are two systems operating in parallel. In the case of instrumentation, System 1 usually provides the captain with information and System 2 the first officer.
source: ICAO English Pro Aviation Glossary

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