Assertion: horizontal stabilizer | /r/HasProperty | useless
Facets:
value: for trimming the aircraft
type: PURPOSE
Source sentences:
text: When the elevators are released, they return to their faired position, in which they produce no net pitching moment;6 in contrast, the horizontal stabiliser does not return to its previous position (it would otherwise be useless for trimming the aircraft), but, rather, has to be actively driven back to a position suitable for normal flight, leaving the aircraft out-of-trim (potentially quite severely so) until the stabiliser can be cranked