Please be advised that, on Tuesday, April 19th, RIOC will be adding a new
AVAC manhole in the west line, behind Building 505 in Rivercross. This is
required in order to access and remove materials (garbage) that are
obstructing the discharge line that conveys into the main west side line.
This will take approximately 2 weeks to be completed. ENVAC, the company
that makes the repairs to our AVAC system will service the system in the
following weeks.

I asked RIOC yesterday:

Does this mean that the AVAC system is down for all of Roosevelt Island for
next 2 weeks. Or just some buildings?

But no answer.

Here’s how the Roosevelt Island AVAC system works

and doesn’t work when it gets jammed.