Assertion: aircraft's propeller | /r/HasProperty | device
Facets:
value: often
type: TEMPORAL
Source sentences:
text: For smaller engines, such as outboards, where the propeller is exposed to the risk of collision with heavy objects, the propeller often includes a device that is designed to fail when overloaded; the device or the whole propeller is sacrificed so that the more expensive transmission and engine are not damaged.