Has such a situation (i.e. no proof but suspicion of likely cause) arisen before and how did the industry react?
Regards, Tanimbar
Think TWA800...you should know the rest.
and the AAIB/NTSB can't demand or regulate, their job is to investigate and recommend. An no they won't wait for the winter months. As soon as they learn anything that can/should be fixed, even if not in the causal chain they will issue a recommendation for the industry to act on.