Boeing OC-135B Open Skies

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  3/21/2018Boeing OC-135B Open Skies - Wikipedia OC-135 Open Skies Role Observation Support/SupportOpen Skies Treaty Manufacturer  Boeing Military AirplanesDivision Introduction June 1993 Primary user  United States Air Force Number built 3 Developed from C-135 Stratolifter  Boeing OC-135B Open Skies The OC-135B Open Skies  United States Air Force observation aircraft supports the Treaty on Open Skies. [1]  Theaircraft, a modified WC-135B, flies unarmed observation flights over participating parties of the treaty. Three OC-135Baircraft were modified by the Aeronautical Systems Center's 4950th Test Wing at Wright-Patterson Air Force Base inOhio. The first operationally-capable OC-135B was assigned to the 24th Reconnaissance Squadron at Offutt AFB inOctober 1993. It is now fitted with a basic set of navigational and sensor equipment, and was placed in inviolate storageat the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base near Tucson, Arizona in1997. Two fully operational OC-135B aircraf t were delivered in 1996 with the full complement of treaty-allowedsensors, which includes an infrared line scanner, synthetic aperture radar and video scanning sensors. Description of aircraftFlight pathModificationsSpecifications (OC-135)See alsoReferences The interior seats 35 people, including the cockpit crew, aircraft maintenance crew, foreign country representatives and crew members from the U.S. Department of Defense'sDefense Threat Reduction Agency (DTRA). Cameras installed include one vertical and two oblique KS-87E framing cameras used for low-altitude photography approximately 3,000 feet (900 m) above the ground, and one KA-91C panoramic camera, which scans from side to side to provide a w ide sw eep for each picture used for high-altitudephotography at approximately 35,000 feet (11,000 m).The data annotation and recording system (DARMS) processes navigational, altitude, time and camera signals to annotate each picture with correct position, altitude, time,roll angle and other information. In addition, this system records every picture taken according to camera, frame and navigational position. A keyboard with trackball is theinput device for operation of this system. Two Barco 12-inch (30 cm) VGA color monitors display camera annotation and other camera data on screen for the sensor operatorand observer use.Camera control, located in the sensor operator's console, operates and adjusts individual cameras for cloud cover, frame overlap and other functions. The sensor operatorconsole seats four and has all the equipment listed above plus camera bay heating control, chronometers, emergency oxygen, interphone and individual lighting. The flightfollow ing console also seats four and includes most of the equipment listed above except for DARMS and camera controls.Seven commercial Norcold Tek II coolers with individual refrigeration units maintain temperature and humidity control to maintain peak film performance. The units can beremo ved, if necessary, f rom the aircraft in order to transport film. The coolers are capable of storing 40,000 feet (12,000 m) of film.The aircraft flies on its intended flight path throughout the entire mission with no reliance on ground-based navigation devices. A top-of-the-line commercial system, Litton92 INS/GPS, which is an integrated inertial navigation system (INS) with a global positioning s ystem (GPS), provides continuous updates. The GPS updates the INS severaltimes per second to correct any deviations in the flight path. The INS also feeds precise latitude, longitude, time, roll angle and barometric altitude to the DARMS and camera systems. A true airspeed computer feeds true airspeed data to the INS. 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.It is accurate from 0–50,000 feet (0–15,000 m) above the ground level. Plus, a metric altimeter is installed on the pilot's instrument panel for altitude reference when flying in countries that use meters for altitude reference.The aircraft are being upgraded with the Block 30 Pacer Crag Navigational System upgrade, a first step in making them compliant with ICAO mandated Global Air TrafficManagement and Global Air Navigation Standards guidelines.The OC-135B modifications center around four cameras installed in the rear of the aircraft. Since its primary mission is to take pictures, most of the installed equipment andsystems provide direct support to the cameras and the camera operator. Other modifications to the aircraft also included installing an auxiliary power unit, crew luggagecompartment, sensor operator console, flight following console and upgraded avionics. Though the aircraft feature a large window in the cargo door, this is simply a remnantof their previous weather reconnaissance role.Other modifications support the aircrew. A gaseous oxygen system replaced the liquid oxygen system to be more compatible with foreign airfields, and fluorescent lightingsystem was added throughout the cabin to provide adequate lighting for operation and inspections. Four upgraded seats with a conference table, interphone, lighting andoxygen comprise the mission commanders' station for both countries' mission commanders. A four channel interphone system enables segregated communications between various elements on board. The auxiliary power unit enables the aircraft to start engines and provides electrical power and cabin heat independent of ground supportequipment. It was manufactured by Allied Signal with the installation and design of the installation by E-Systems and World Auxiliary Power Company.The aircraft are assigned to Air Combat Command at the 55th Wing, 45th Reconnaissance Squadron, Offutt Air Force Base near Omaha, Nebraska, for operations, trainingand maintenance. When tasked, ACC's role is to transport a DTRA observation team to an Open Skies point of entry airport, and conduct the observation flight, then returnthe team to the continental United States. ContentsDescription of aircraftFlight pathModifications  3/21/2018Boeing OC-135B Open Skies - Wikipedia  Data from General characteristics Crew:  Seven (three pilots, two navigators, and two sensor maintenance technicians), also DTRA mission flight crew: missioncommander, deputy mission commander, two sensor operators and one flight follower  Length:  136 ft 3 in (41.53 m) Wingspan:  130 ft 10 in (39.88 m) Height:  41 ft 8 in (12.70 m) Wing area:  2,433 ft² (226 m²) Empty weight:  98,466 lb (44,663 kg) Loaded weight:  297,000 lb (135,000 kg) Max. takeoff weight:  322,500 lb (146,000 kg) Powerplant:  4 × Pratt and Whitney TF33-P-5 Turbofans with thrust reversers, 18,000 lbf (80 kN) each Performance Maximum speed:  580 mph (933 km/h) Range:  3,450 mi (5,550 km) Service ceiling:  50,000 ft (15,200 m) Rate of climb:  4,900 ft/min (1,490 m/min) Related development Boeing C-135 Stratolifter Boeing KC-135 Stratotanker Boeing WC-135 Constant Phoenix Related lists List of active United States military aircraft1. OC-135B Open Skies (  . US Air Force. 1 February 2001.Retrieved 15 November 2014. This article includes public domain text from the following United States Government source: OC-135B Fact Sheet ( published by the Air Combat CommandRetrieved from This page was last edited on 7 August 2017, at 15:25. Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and PrivacyPolicy. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization. Specifications (OC-135)See alsoReferences
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