The manufacturer gets involved very early on in the investigation. Not only do they have a vested interest in the outcome, but their knowledge of the aircraft type is normally of the utmost importance in unraveling what happened.
There are major implications in grounding (or not grounding) a fleet. If the manufacturer grounds all the aircraft unnecessarily, there are major expenses (not only the inspections themselves, but the loss of revenue and the cost of finding alternative types to cover contracts etc.). Indirectly, it will also create a loss of confidence in the brand and could jeopardize future sales.
Conversely, if the manufacturer does not ground an aircraft and a similar event occurs... well you can see where that one will go, particularly if it is subsequently shown that they had a good idea what the issue was!
So what it will boil down to is a realistic assessment by legal teams, engineers and management on a case-by-case basis having considered all the facts and recommendations from investigatory bodies.
The manufacturer will certainly have far more information that the general public and operators, so it makes it very hard for us to guess what will happen.
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