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Why is a &Terrain Inhibit& function required in TAWS installations?

April 26, 2017function installations taws

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Why is a &Terrain Inhibit& function required in TAWS installations?

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Terrain Avoidance and Warning Systems (TAWS) require the installation of a &Terrain Inhibit& switch as part of the system installation. When switched, this function will inhibit all audio and visual (where applicable) alerts to the pilot. The purpose of the Terrain Inhibit function is to allow aircraft to operate without nuisance or unwanted warnings at airports that are not in the system database. An example of such an unwanted warning might be a private airport or those airports with runways shorter than 2000 feet. In addition, there may be some VFR type airports where unique terrain features are in close proximity to the runway. Other special aircraft operations or applications such as Forest Service or firefighting missions may require this inhibit function as well. Generally, the Terrain Inhibit function will only remain engaged for the particular alert that is presently giving and will be disabled when another alert is encountered.