Assertion: obstruction | /r/HasProperty | hazard
Facets:
value: for air navigation
type: PURPOSE
value: to air navigation
type: TRANSITIVE-OBJECT
Source sentences:
text: In addition, not all obstructions are a hazard to air navigation, as described below.
text: An FAA review is required to determine whether an object required to file under FAR Part 77.17 is an obstruction and whether the obstruction is an obstacle or a hazard for air navigation.