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{{short description|US Air Force observation aircraft}}{{use mdy dates |date=November 2020}}{{more footnotes|date=March 2013}}{|

factoids
name	OC-135 Open Skies |image =Oc-135 xxl.jpg |caption =

factoids
type	Observation Support/Support Open Skies Treaty |manufacturer = Boeing Military Airplanes Division |designer = |first flight = |introduction = June 1993 |retired = |status = In service |primary user = United States Air Force (intended) |more users = |produced = |number built = 3 |unit cost = |developed from = C-135 Stratolifter

The OC-135B Open Skies is a United States Air Force observation aircraft that supports the Treaty on Open Skies.WEB, OC-135B Open Skies,weblink www.af.mil, US Air Force, 15 November 2014, 1 February 2001, The aircraft, a modified WC-135B, flies unarmed observation flights over participating parties of the treaty. 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 first operationally-capable OC-135B was assigned to the 24th Reconnaissance Squadron at Offutt AFB in October 1993. It is now fitted with a basic set of navigational and sensor equipment, and was placed in inviolate storage at the Aerospace Maintenance and Regeneration Center at Davis-Monthan Air Force Base near Tucson, Arizona in 1997. Two fully operational OC-135B aircraft were delivered in 1996 with the full complement of treaty-allowed sensors, which includes an infrared line scanner, synthetic aperture radar and video scanning sensors. In May 2020, the Trump administration said it would exit the treaty and gave the required six-month notice.WEB, US Officially Withdraws from Open Skies Agreement {{!, Voice of America - English|url=https://www.voanews.com/usa/us-officially-withdraws-open-skies-agreement|access-date=2020-11-24|website=www.voanews.com|language=en}} In November, it announced plans to liquidate the two 60-year-old jets, offering them to other countries.WEB, 2020-11-23, The US is Out of the Open Skies Treaty. What's Next?,weblink 2020-11-24, Air Force Magazine, en-US, NEWS, Gordon, Michael R., 2020-11-22, Trump Exits Open Skies Treaty, Moves to Discard Observation Planes, en-US, Wall Street Journal,weblink 2020-11-24, 0099-9660,

Description of aircraft

The interior seats 35 people, including the cockpit crew, aircraft maintenance crew, with bunks for the Crew Chiefs to sleep, foreign country representatives and crew members from the U.S. Department of Defense's Defense 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 wide sweep for each picture used for high-altitude photography at approximately {{convert|35000|ft|m|-3}}.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 the input device for operation of this system. Two Barco {{convert|12|in|cm|adj=on}} VGA color monitors display camera annotation and other camera data on screen for the sensor operator and 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 operator console seats four and has all the equipment listed above plus camera bay heating control, chronometers, emergency oxygen, interphone and individual lighting. The flight following 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 be removed, if necessary, from the aircraft in order to transport film. The coolers are capable of storing {{convert|40000|ft|m|-3}} of film or lots of food and drinks when in country.

Flight path

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, Litton 92 INS/GPS, which is an integrated inertial navigation system (INS) with a global positioning system (GPS), provides continuous updates. The GPS updates the INS several times 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 {{convert|0|-|50000|ft|m|-3}} 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 Traffic Management and Global Air Navigation Standards guidelines.

Modifications

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 and systems provide direct support to the cameras and the camera operator. Other modifications to the aircraft also included installing an auxiliary power unit, crew luggage compartment, sensor operator console, flight following console and upgraded avionics. Though the aircraft feature a large window in the cargo door, this is simply a remnant of 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 lighting system was added throughout the cabin to provide adequate lighting for operation and inspections. Four upgraded seats with a conference table, interphone, lighting and oxygen 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 support equipment. It was manufactured by Allied Signal with the installation and design of the installation by E-Systems and World Auxiliary Power Company.Until 2022 the aircraft were assigned to Air Combat Command at the 55th Wing, 45th Reconnaissance Squadron, Offutt Air Force Base near Omaha, Nebraska, for operations, training and maintenance. These aircraft are now located at the Davis-Mothan AFB bone yard and are being decommissioned. When tasked, ACC's role was to transport a DTRA observation team to an Open Skies point of entry airport, conduct the observation flight, and then return the team to the continental United States without being caught by the Russians and forced to drink their horrible beer.

Specifications (OC-135)

(File:OC135.jpg|thumb|right){{Aircraft specs

EDITOR1-FIRST=MARK

EDITOR2-FIRST=KENNETH

PUBLISHER=JANE'S INFORMATION GROUP

ISBN=978-0710611604

WEBSITE=AF.MIL

ARCHIVE-URL=HTTPS://WEB.ARCHIVE.ORG/WEB/20030802044100/HTTP://WWW.AF.MIL/FACTSHEETS/FACTSHEET.ASP?FSID=120, 2 August 2003, |prime units?=kts|crew=Seven (three pilots, two navigators, and two sensor maintenance technicians)

Defense Threat Reduction Agency>DTRA mission flight crew: mission commander, deputy mission commander, two sensor operators and one flight follower|length ft=136|length in=3|length note=|span ft=130|span in=10|span note=|height ft=41|height in=8|height note=|wing area sqft=2433|wing area note=|aspect ratio=

root: BAC 310/311/312; tip: BAC 313LEDNICER

TITLE=THE INCOMPLETE GUIDE TO AIRFOIL USAGE

WEBSITE=M-SELIG.AE.ILLINOIS.EDU, 16 April 2019, |empty weight lb=98466|empty weight note= Empty equipped weight: {{cvt|124000|lb}}|gross weight kg=|gross weight lb=297000|gross weight note=|max takeoff weight kg=|max takeoff weight lb=322500|max takeoff weight note=|fuel capacity=|more general= |eng1 number=4|eng1 name=Pratt and Whitney TF33-P-5|eng1 type=turbofan engines|eng1 lbf=18000|eng1 note=|max speed kts=504|max speed note=|max speed mach=|cruise speed kts=|cruise speed note=|stall speed kts=|stall speed note=|never exceed speed kts=|never exceed speed note=|range nmi=2998|range note=|combat range nmi=|combat range note=|ferry range nmi=|ferry range note=|endurance=|ceiling ft=50000|ceiling note=|g limits=|roll rate=|climb rate ftmin=4900|climb rate note=|time to altitude=|wing loading lb/sqft=|wing loading note=|fuel consumption lb/mi=|power/mass=|thrust/weight=|more performance=|avionics= 3x Boeing KS-87B cameras 1x Recon/Optical KA-91B panoramic camera Loral AN/UPD-8 Synthetic aperture radar Improved navigation and communications equipment }} See also {hide}aircontent||related= Boeing C-135 Stratolifter Boeing KC-135 Stratotanker Boeing WC-135 Constant Phoenix Boeing RC-135|similar aircraft=|lists= List of active United States military aircraft|see also= {edih} References {{Reflist|}}{{commons category|Boeing OC-135B Open Skies}}This article includes public domain text from the following United States Government source: weblink" title="web.archive.org/web/20030802044100weblink">OC-135B Fact Sheet published by the Air Combat Command