WaytoomuchEurope, although I spent a good portion of today buried within the bowels of a large four-engined jet today, I am not a maintenance engineer, so please don't place any degree of faith in my prognosticatory musings. I consulted my good friend Mr Google, and an interstage seal seems to be wedged between two major, yet very much internal components of a turbine engine. However, with the necessary staff & tooling, I've seen engines wholesale swapped, or torn apart and put back together in remarkably short periods of time.
These are the workhorses of AC's most lucrative routes and the airline is already, as we all know, capacity-constrained so I imagine if there's a critical AD to address, it will be accomplished with all hands on deck.
Originally Posted by RangerNS
All normal aviation things. Nothing to see here.
Bingo.