I admit I don't fly a Shorts, but on a Boeing there is no caveat saying it's ok on the ground rather than in the air. Setting an aircraft on fire may be potentially less lethal on the ground, but it's still not a great idea!
What the engineers do in controlled conditions is their business.
Had the CB stayed in on the third or fourth attempt, would you have called the problem solved and gone flying? It poped the othe two or three times for a reason!