Other safety experts said the causes could include heated elements left in a galley just below where the fire burned the jet's carbon-composite skin, a poorly installed part, or a short in the plane's electrical system.
The company installed part of that new 20-inch pipe on Monday, then capped the ends of the pipe temporarily, said Matthew Monahan, a spokesman for the city's Department of Design and Construction.
This past spring, in a small gallery on the fourth floor, she installed part of "The Migration Series" (1940-41), a suite of 30 paintings by the African-American painter Jacob Lawrence, who gave each work a long, explanatory title.
The seats have since been re-covered, but this summer they will be removed and new ones installed, part of continuing renovations that have seen the construction of a stage, new lighting and two generations of rest rooms.
During a 2010 blizzard, as the city was preparing to install parts of the new system, it was overwhelmed again.
Many nostalgia-car enthusiasts modify the engines and suspensions, and install parts made for Japan-market models.
Most recent shuttle missions -- but not the one that broke apart yesterday -- were to ferry astronauts to and from the space station and to deliver and install parts.
Various stages along the assembly line, like the body shop and trim area, are more compact, with teams of six workers installing parts fed to them on automated carts by independent suppliers who operate inside the plant.
