Three OC-135B aircraft were modified by the Aeronautical Systems Center's 4950th Test Wing at Wright-Patterson Air Force Base in Ohio but only two were ever used.

The sensor operator console seats four and has all the equipment listed above plus camera bay heating control, chronometers, emergency oxygen, interphone and individual lighting.

The coolers are capable of storing 40,000 feet (12,000 m) of film or lots of food and drinks when in country.

The aircraft flies on its intended flight path throughout the entire mission with no reliance on ground-based navigation devices.

The INS also feeds precise latitude, longitude, time, roll angle and barometric altitude to the DARMS and camera systems.

A combined altitude radar altimeter provides precise height above ground information to the pilot for navigational purposes as well as a signal to DARMS for film annotation.

Though the aircraft feature a large window in the cargo door, this is simply a remnant of their previous weather reconnaissance role.

Data from Jane's all the World's Aircraft 1994–95 (crew and operational equipment),[5] AF Fact Sheet : OC-135B OPEN SKIES[6]General characteristics Performance Avionics

Related lists This article includes public domain text from the following United States Government source: