Originally Posted by
Vessbot
I think you mistyped here and are defending single switch instead of "both switches?"
If so then yes that's one solution. But a far better one would be to not have the problem in the first place.
I didn't mistype. Both designs have 2 switches. The A300/310 has a single lever which controls both switches.
Both systems are designed to prevent pitch trim runaway by only activating the pitch trim if both switches are in the same position.
both designs will runaway if both switches are stuck in the same position. On A300/310 there is an audio whooler to alert crew if THS continuously runs for more than 1 second. The runaway can be stopped by grabbing and holding the trim wheel. This will cause the pitch trim to automatically disengage.
On the dual rocker switch design, you need to grab and hold the trim wheel and disengage the pitch trim manually via the guarded switches.
Both designs have been proven to work. Both designs have protections against pitch trim runaway, Airbus just does it more elegantly by providing automatic pitch trim disengagement in case of switch position disagree or grabbing of trim wheel.