OC-135 Open Skies
        Brief:  A modified C-I 35 aircraft that flies unarmed
 observation and verification flights over nations that
 are parties to the 1992 Open Skies treaty.
        Function:       Reconnaissance aircraft.
        Operator:       ACC.
        First Flight: June 1993.
        Delivered:      October 1993.
        IOC:   October 1993.
        Production: three.
        Inventory: three.
        Ceiling: 50,000 ft (basic C-135).
        Unit Location: Offutt AFB, Neb.
        Contractor: Boeing.
        Power Plant: four Pratt & Whitney TF33-P-5 turbofans
 each 16,050 lb thrust.
        Accommodation:  seating for 38.
        Dimensions:   span 131 ft, length 135 ft, height 42 ft.
        Weight gross: 297,000 lb.
        Performance: speed: 500+ mph, unrefueled range 3,900 miles.
        COMMENTARY
        A version of the WC-135, modified for specialized reconnais-
 sance with an infrared linescanner, synthetic aperture radar,
 and forward- and vertical-looking video cameras, to monitor the
 1992 Open Skies Treaty.
        OC-135B modifications center around four camerasn installed
 in the rear of the aircraft. Cameras installed include one vertical
 and two oblique KS-87 framing cameras used for low-altitude photo-
 graphy approximately 3,000 feet above the ground, and one KA-91 pan
 camera, which pans from side to side to provide a wide sweep for
 each picture, used for high-altitude photography at approximately
 35,000 feet. Data is processed and recorded by the Miletus camera
 annotation system.
 AIR FORCE Magazine/May 1998
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