This is the largest open port cavity to have ever flown. The door opening measures 135 inches in length. The structural opening is over 180 inches in length. Behind the Aerowindow is a large un-pressurized room. This room is pre-cooled so that when the door is opened there is minimal thermal shock.

DC-10 modified for MDA and initially operated by Raytheon Flight Test Organization

Enclosure cooling system.