it appears to either be starting or ending an engine change to the #4 engine. Looking at the JLG's on both sides of the engine and the crane for the Nose cowl , As a mechanic?? That's my best Guess..
Do they even Have a hangar at JFK
that will Fit an A380?? I haven't been on the Ground at JFK
in over 30 Years but when I was thee last I thought Hangar 19 was large enough.
I KNOW the United Hangars couldn't so the old TWA and Pan-AM hangars were the best bet.
That's Got to be a blow to their engine Reliability program. But then again ? Maybe not. The FAA tracks EVERY in flt shutdown or internal failure against ETOPS engine reliability even on a 4 engine airplane. As they're Not US Registered that might not be the case where they come from.