McDonnell Douglas KC-10 Extender

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KC-10 Extender
KC-10 Extender (2151957820).jpg
A United States Air Force KC-10 Extender refueling an F-16 Fighting Falcon
General information
Type Tanker/transport
National originUnited States
Manufacturer McDonnell Douglas
StatusIn limited service
Primary users United States Air Force (historical)
Number builtKC-10: 60
KDC-10: 2
History
ManufacturedKC-10: 1979–1987
Introduction date1 March 1981;43 years ago (1981-03-01)
First flight12 July 1980;44 years ago (1980-07-12)
Retired2021 (RNLAF)
2024 (USAF)
Developed from McDonnell Douglas DC-10

The McDonnell Douglas KC-10 Extender is an American tanker and cargo aircraft that was operated by the United States Air Force (USAF) from 1981 to 2024. A military version of the three-engine DC-10 airliner, the KC-10 was developed from the Advanced Tanker Cargo Aircraft Program. [N 1] It incorporates military-specific equipment for its primary roles of aerial refueling and transport. It was developed to supplement the KC-135 Stratotanker following experiences in Southeast Asia and the Middle East. The KC-10 was the second McDonnell Douglas transport aircraft to be selected by the Air Force following the C-9. A total of 60 KC-10s were produced for the USAF. The Royal Netherlands Air Force operated two similar tankers designated KDC-10 that were converted from DC-10s. [1]

Contents

The KC-10 played a key role in the mobilization of US military assets, taking part in overseas operations far from home. These aircraft performed airlift and aerial refueling during the 1986 bombing of Libya (Operation Eldorado Canyon), the 1990–91 Gulf War with Iraq (Operations Desert Shield and Desert Storm), the NATO bombing of Yugoslavia (Operation Allied Force), War in Afghanistan (Operation Enduring Freedom), and Iraq War (Operations Iraqi Freedom and New Dawn).

Design and development

Advanced Tanker Cargo Aircraft Program

An early KC-10 Extender aircraft refuels a C-5 Galaxy in 1980. Both aircraft are wearing liveries typical of that era. AN air-to-air left side view of a KC-10 Extender aircraft refueling a C-5 Galaxy aircraft - DPLA - ddb9e73e4eb4f688c466e70c9a31f1da.jpeg
An early KC-10 Extender aircraft refuels a C-5 Galaxy in 1980. Both aircraft are wearing liveries typical of that era.

During the Vietnam War, doubts began to form regarding the Boeing KC-135 Stratotanker fleet's ability to meet the needs of the United States' global commitments. The aerial refueling fleet was deployed to Southeast Asia to support tactical aircraft and strategic bombers, while maintaining the U.S.-based support of the nuclear-bomber fleet. Consequently, the Air Force sought an aerial tanker with greater capabilities than the KC-135. In 1972, two DC-10s were flown in trials at Edwards Air Force Base, simulating air refuelings to check for possible wake issues. Boeing performed similar tests with a 747. [2]

During the 1973 Yom Kippur War, the Air Force commenced Operation Nickel Grass to supply Israel with weapons and supplies. The operation demonstrated the necessity for adequate air-refueling capabilities; denied landing rights in Europe, C-5 Galaxy transports were forced to carry a fraction of their maximum payload on direct flights from the continental United States to Israel. [3] [4] To address this shortfall in mobility, in 1975, under the Advanced Tanker Cargo Aircraft Program, four aircraft were evaluated—the Lockheed C-5, the Boeing 747, the McDonnell Douglas DC-10, and the Lockheed L-1011. [5] The only serious contenders were Boeing and McDonnell Douglas. In December 1977, McDonnell Douglas's DC-10 was chosen. The primary reason for this choice was the KC-10's ability to operate from shorter runways. [4] Initially, a batch of 12 aircraft was ordered, but this was later increased to 60. [4]

KC-10 Extender

The KC-10 Extender first flew in July 1980. In October 1980 the first aerial refuel sortie was performed. [6] [7] The design for the KC-10 involved modifications from the DC-10-30CF design. Unnecessary airline features were replaced by an improved cargo-handling system and military avionics. [8] The KC-10 retained an 88% commonality with its commercial counterparts, giving it greater access to the worldwide commercial support system. [4] Other changes from the DC-10-30CF include the removal of most windows and lower cargo doors. [9] Early aircraft featured a distinctive light gray, white and blue paint scheme, and a gray-green camouflage scheme was used on later tankers. The paint scheme was switched to a medium gray color by the late 1990s. [10]

The KC-10's refueling boom operator is seated rather than prone A KC-10A Extender aircraft refueling boom operator of the 9th Air Refueling Squadron refuels an F-4 Phantom II aircraft during Theater Force Employment Exercise IV DF-ST-86-04188.jpg
The KC-10's refueling boom operator is seated rather than prone

The most notable changes were the addition of the McDonnell Douglas Advanced Aerial Refueling Boom and additional fuel tanks located in the baggage compartments below the main deck. The extra tanks increase the KC-10's fuel capacity to 356,000 lb (161,478 kg), nearly doubling the KC-135's capacity. [6] The KC-10 has both a centerline refueling boom—unique in that it sports a control surface system at its aft end that differs from the V-tail design used on previous tankers—and a drogue-and-hose system on the starboard side of the rear fuselage. The KC-10 boom operator cockpit is seated in the rear of the aircraft with a wide window for monitoring refueling rather than prone as in the KC-135. The operator controls refueling operations through a digital fly-by wire system. [10] [11] The refueling boom can deliver fuel to a receiver at the maximum rate of 1,100 gallons (4,180 liters) per minute, while the centerline drogue system has a maximum fuel offload rate of 470 gallons (1,786 liters) per minute. [12]

The KC-10's mixed refueling system of hose-and-drogue and flying-boom allows it to refuel the aircraft of the U.S. Air Force, U.S. Navy, U.S. Marine Corps and allied forces. US Navy 021107-N-2794R-002 KC-10 'Extender' refuels a F-A-18C 'Hornet'.jpg
The KC-10's mixed refueling system of hose-and-drogue and flying-boom allows it to refuel the aircraft of the U.S. Air Force, U.S. Navy, U.S. Marine Corps and allied forces.

Unlike the KC-135, the KC-10's hose-and-drogue system allows refueling of Navy, Marine Corps, and most allied aircraft, all in one mission. [6] The final twenty KC-10s produced included wing-mounted pods for added refueling locations. [2] The KC-10 can carry a complement of 75 personnel with 146,000 lb (66,225 kg) of cargo, or 170,000 lb (77,110 kg) in an all-cargo configuration. [6] With that, it can transport those weights for an unrefueled range of 4,400 miles (7,040 km). [12] The KC-10 has a side cargo door for loading and unloading cargo. Handling equipment is required to raise and lower loads to the cargo opening. It can carry cargo and serve as a tanker on overseas missions. [13]

Further developments

A need for new transport aircraft for the Royal Netherlands Air Force (Koninklijke Luchtmacht) was first identified in 1984. [14] The 1991 Gulf War highlighted the deficiencies in mobility of European forces. [15] In 1991 four categories of transport requirements were established. Category A required a large cargo aircraft with a range of at least 4,500 km and the capability to refuel F-16s. In 1992, two DC-10-30CFs were acquired from Martinair in a buy/leaseback contract. When one of the two aircraft was lost in the Martinair Flight 495 crash, a third aircraft was bought from Martinair. [14]

The conversion was handled via the United States foreign military sales program, which contracted McDonnell Douglas. Costs for the conversion were initially estimated at $89.5 million (FY 1994). The aircraft were to be equipped with both a boom and a probe and drogue system. Because McDonnell Douglas did not have any experience with the requested Remote Aerial Refueling Operator (RARO) system, and because the third aircraft differed from the original two, the program could not be completed at budget. By omitting the probe and drogue system and a fixed partition wall between the cargo and passenger, the cost could be limited at $96 million. [14]

To make up for the cost increase McDonnell Douglas hired Dutch companies to do part of the work. The conversion of the aircraft was performed by KLM and was done from October 1994 to September 1995 for the first aircraft and from February to December 1995 for the second. This was much longer than planned, mostly because McDonnell Douglas delivered the parts late. This would have again increased the cost, but in the contract for the AH-64 Apaches which the Royal Netherlands Air Force also bought from McDonnell Douglas, the price was agreed to be kept at $96 million. [14]

In 2010, the USAF awarded a contract to Boeing to upgrade the fleet of 59 aircraft with new Communication, navigation and surveillance and air traffic management (CNS/ATM) system. This was to allow the aircraft to fly in civil airspace as new ICAO and FAA standards took effect in 2015. [16] Rockwell Collins was awarded a contract in 2011 for avionics and systems integration for the cockpit modernization program. [17] [18]

Operational history

United States

The first KC-10 was delivered to the Air Force's Strategic Air Command (SAC) in March 1981 at Barksdale AFB. In 1982 a newly renamed 22d Air Refueling Wing, formerly the 22d Bombardment Wing, was re-equipped with KC-10A Extenders and became the second Air Force unit to operate the new tankers.[ citation needed ] The 60th and final KC-10 was delivered on 29 November 1988. [19] The KC-10s served with SAC until 1992, when they were reassigned to the newly established Air Mobility Command. In the aerial refueling role, the KC-10s have been operated largely in the strategic refueling of large number of tactical aircraft on ferry flights and the refueling of other strategic transport aircraft. Conversely, the KC-135 fleet has operated largely in the in-theater tactical role. There are 59 KC-10 Extenders in service with the USAF as of 2010. [13] [16] The USAF's KC-10s are stationed primarily at Travis AFB, California, and McGuire AFB, now part of Joint Base McGuire-Dix-Lakehurst, in New Jersey.

A US Navy F-14D and two F/A-18Cs prepare to refuel from a KC-10 in 2005 over the Persian Gulf. USAF F-14D and F-18C's prepare to refuel.jpg
A US Navy F-14D and two F/A-18Cs prepare to refuel from a KC-10 in 2005 over the Persian Gulf.

When faced with refusals of basing and overflight rights from continental European countries during Operation El Dorado Canyon, the U.S. was forced to use the UK-based F-111s in the 1986 air-strikes against Libya. The KC-10s and KC-135s allowed 29 F-111s, along with other Air Force and Navy aircraft, to reach their targets. [20] The KC-10 again played a key role during Operations Desert Shield and Desert Storm in 1991. KC-10s facilitated the deployment of tactical, strategic, and transport aircraft to Saudi Arabia. In the early stages of Operation Desert Shield, aerial refueling was key to the rapid airlift of materiel and forces. In addition to refueling airlift aircraft, the KC-10, along with the smaller KC-135, moved thousands of tons of cargo and thousands of troops in support of the massive buildup. The KC-10 and the KC-135 conducted about 51,700 separate refueling operations and delivered 125 million gallons (475 million liters) of fuel without missing a single scheduled rendezvous. [13]

A KC-10 Extender of Travis AFB approaching a second KC-10 for refuelling over the Pacific Ocean, 2017 McDonnell-Douglas KC-10 Extender prepares to be refuelled by another KC-10, Exercise Talisman Saber 2017.jpg
A KC-10 Extender of Travis AFB approaching a second KC-10 for refuelling over the Pacific Ocean, 2017

Since then, the KC-10 had participated in other smaller conflicts. In March 1999, NATO launched Operation Allied Force against the government of Yugoslavia. The mobility portion of the operation began in February and was heavily dependent on tankers. By early May 1999, some 150 KC-10s and KC-135s deployed to Europe where they refueled bombers, fighters and support aircraft engaged in the conflict. The KC-10 flew 409 missions throughout the entire Allied Force campaign and continued support operations in Kosovo. [13] Since 11 September 2001, KC-10s had flown more than 350 missions guarding U.S. skies as a part of Operation Noble Eagle. During Operations Enduring Freedom and Iraqi Freedom, KC-10s flew more than 1,390 missions delivering critical air refueling support to numerous joint and Coalition receiver aircraft. [13] As of 2004, KC-10s were expected to serve until 2043. [21]

The Air Force considered retiring its fleet of KC-10 tankers in response to sequestration budget cuts as part of the service's FY 2015 budget. A "vertical chop" to divest all KC-10s was suggested because there are fewer KC-10s than KC-135s, having three different tanker models in service after the introduction of the KC-46 would be costly, and a "horizontal cut" across the refueling fleets would achieve small efficiencies. [22] Some believed retiring the KC-10 would not benefit the Air Force, given that it is equipped with both boom and hose-and-drogue refueling systems and the fleet's relatively young age. [23]

The last U.S. Air Force KC-10 takes off from Travis Air Force Base, California, 26 Sept. 2024. 240926-F-OY799-1632.jpg
The last U.S. Air Force KC-10 takes off from Travis Air Force Base, California, 26 Sept. 2024.

At first, officials claimed that the initial focus on retiring the KC-10 in September 2013 was a "trial balloon" to call attention to Air Force operating cost issues. As of early 2013, the KC-10 had a per hour flying cost of $21,170 and a mission capable rate of 87 percent. [24] A FY 2015 budget plan did not include cuts to the KC-10. [25] In July 2020, the first US KC-10 to be retired, tail number 86-0036, was transferred to the 309th Aerospace Maintenance and Regeneration Group (AMARG) for storage at Davis-Monthan Air Force Base, Arizona. [26]

In July 2021, the 2d ARS was the first KC-10 squadron to start conversion to the KC-46. [27] In August 2021, the KC-10 took part in the largest non-combatant evacuation in support of Operation Allies refuge and contributing to the safe evacuation of more than 124,000 Afghan refugees. [28]

In January 2023 the USAF announced that all KC-10s are to be retired by 30 September 2024. [29] The KC-10 flew its last combat sortie for the USAF on 5 October 2023. [30] On 26 September 2024, the KC-10 flew its final sortie on tail number 79-1948 bound for the 309th Aerospace Maintenance and Regeneration Group (AMARG) at Davis-Monthan Air Force Base, Arizona. [31]

Netherlands

The two Dutch KDC-10s were used for both refueling and transport. [32] They were stationed on Eindhoven Airport as part of the 334th Transport Squadron. Of the 5,500 hours flown in the first three years of use, the aircraft were used in their tanker role for 50% of the time. Besides being used by the air force and NATO allies, the KDC-10s were also used to support peacekeeping and humanitarian aid operations. Of the first three years, 32% of the flight hours were used for peacekeeping and humanitarian aid. [14]

The second Royal Netherlands Air Force KDC-10 with landing gear down McDonnell Douglas KDC-10-30CF der RNLAF.jpg
The second Royal Netherlands Air Force KDC-10 with landing gear down

In this function, the aircraft was deployed to Kosovo to evacuate refugees, to the Caribbean and Central America to provide humanitarian aid after the hurricanes Luis, Georges and Mitch and to various countries in Africa and Asia to provide development aid. In 1998, the aircraft were used to evacuate Dutch citizens from Indonesia during the Fall of Suharto. Dutch KDC-10s operated out of Manas AFB in support of allied forces during Operation Enduring Freedom and in support of Allied Air Force over Iraq and Syria.

A third DC-10, registered T-255 was acquired and served for three years before being withdrawn from service in April 2014 due to Dutch defense cuts and flown to Newquay Airport for scrapping. [33] The KDC-10s in Dutch service were replaced with the Airbus A330 MRTT. [34] The first aircraft, registered T-264/'Prins Bernhard' and due for a major service, was withdrawn from use in November 2019, prior to being transferred to its new owner, Omega Aerial Refueling Services. [35] The last KDC-10, registered T-235/'Jan Scheffer' remained in Dutch service until October 2021. [36] The aircraft left The Netherlands bound for service with Omega in the U.S. in October 2021. [37] [34]

Civilian operators

Omega's KDC-10 tanker in March 2009 Omega Tanker McDonnell Douglas DC-10-40 Avalon Vabre.jpg
Omega's KDC-10 tanker in March 2009

Commercial refueling companies Omega Aerial Refueling Services and Global Airtanker Service operate three KDC-10 tankers, N974VV, N235UL and N264DE, for lease. [38] [39] They were converted from DC-10s and provide probe and drogue refueling capabilities from wing pods similar to the KC-10. [40]

In June and July 2011, Omega Air's KDC-10 supported three Royal Australian Air Force's F/A-18 Hornets, en route to Red Flag – Alaska. [41]

In 2019, Omega agreed to purchase the Netherlands' two KDC-10s. One was received in November 2019, [35] and the second delivered in October 2021. [37] [34]

Variants

Operators

A KC-10 from Travis AFB taking off from RAF Mildenhall USAF KC-10 Extender takeoff at RAF Mildenhall.jpg
A KC-10 from Travis AFB taking off from RAF Mildenhall

Current

Former

Flag of the United States (23px).png  United States
Flag of the Netherlands.svg  Netherlands

Incidents

On 17 September 1987, KC-10A serial number 82-0190 was undergoing maintenance on the ground at Barksdale AFB, Louisiana, and suffered an explosion and subsequent fire. The KC-10 was significantly damaged and written off. One member of the ground crew died in the fire. [45]

Aircraft on display

Specifications (KC-10A)

Data from USAF Fact sheet, [13] Steffen [49]

General characteristics

Performance

See also

Related development

Aircraft of comparable role, configuration, and era

Related lists

Related Research Articles

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References

Notes
  1. ↑ The Handley Page Jetstream had been initially ordered as the C-10, but was soon canceled. This allowed the tanker version of the DC-10 to be designated KC-10A.
Citations
  1. 1 2 "Final KC-10 Extender Tanker Flies Into Retirement". The War Zone. Retrieved 26 September 2024.
  2. 1 2 Waddington 2000, pp. 116–120.
  3. ↑ Endres 1998, p. 65.
  4. 1 2 3 4 Steffen 1998, p. 103.
  5. ↑ Frawley 2002, p. 119.
  6. 1 2 3 4 5 Steffen 1998, p. 104.
  7. ↑ "KC-10A Extender: Background". Globalsecurity.org. Retrieved 27 August 2011.
  8. ↑ Eden 2004, p 286.
  9. ↑ "KC-10A Extender: Characteristics". Globalsecurity.org. Retrieved 27 August 2011.
  10. 1 2 Steffen 1998, pp. 103–107.
  11. ↑ Eden 2004, p 287.
  12. 1 2 "KC-10 Extender".
  13. 1 2 3 4 5 6 "Factsheets: KC-10 Extender". US Air Force. May 2014. Retrieved 30 November 2013.
  14. 1 2 3 4 5 "Evaluatie project KDC-10". Ministerie van Defensie (in Dutch). 1 July 1999. Retrieved 5 January 2014.
  15. ↑ Steffen 1997, p. 107.
  16. 1 2 Trimble, Stephen (24 June 2010). "Boeing outlines C-130H and KC-10 cockpit upgrades". Flightglobal.com . Retrieved 19 September 2010.
  17. ↑ "Boeing Wins CNS-ATM Upgrade Contract for USAF's KC-10 Tankers". Defenseindustrydaily.com. 21 August 2014. Retrieved 16 March 2017.
  18. ↑ "Rockwell Collins awarded contract for KC-10 CNS/ATM cockpit upgrade program". Archived from the original on 9 September 2011. Retrieved 16 January 2019.
  19. ↑ Steffen 1998, pp. 104, 107.
  20. ↑ "Operation El Dorado Canyon". Globalsecurity.org. Retrieved 27 August 2011.
  21. ↑ Veronico and Dunn 2004, p. 58.
  22. ↑ Air Force May Scrap KC-10 Tanker Fleet – DoDBuzz.com, 17 September 2013
  23. ↑ WEISGERBER, MARCUS; MEHTA, AARON (15 September 2013). "USAF Weighs Scrapping KC-10, A-10 Fleets". www.defensenews.com. Gannett Government Media Corporation. Archived from the original on 30 October 2013. Retrieved 30 October 2013.
  24. ↑ Air Force May Scrap Entire A-10 Fleet – Defensemedianetwork.com, 17 October 2013
  25. ↑ How Hagel spending plan will transform US military – Flightglobal.com, 26 February 2014
  26. ↑ "First KC-10 heads to Boneyard as Pegasus comes into the fleet". 16 July 2020.
  27. ↑ "McGuire Squadron Says Goodbye to KC-10, Prepares for KC-46". 2 July 2021.
  28. ↑ "Operation Allies Refuge: One year later". 17 August 2022.
  29. ↑ Rossi Pedroza-Bertrand (30 January 2023). "End of the 10". 349th Air Mobility Wing Public Affairs. Retrieved 13 April 2023.
  30. ↑ Newdick, Thomas (5 October 2023). "KC-10 Extender Has Flown Its Last Combat Mission". The Drive. Retrieved 6 October 2023.
  31. ↑ 60th Air Mobility Wing Public Affairs (27 September 2024). "Travis AFB bids farewell to last KC-10". U.S. Air Force News. Retrieved 27 September 2024.{{cite news}}: CS1 maint: numeric names: authors list (link)
  32. ↑ Steffen 1997, pp. 106–107.
  33. ↑ "Dutch air force scraps DC-10 transport". flightglobal.com. Retrieved 23 June 2019.
  34. 1 2 3 "RNLAF's final KDC-10 tanker leaves the Netherlands". key.aero. 25 October 2021. Retrieved 21 November 2021.
  35. 1 2 "Private aerial refueller Omega buys KDC 10 tankers with booms". flightglobal.com. 25 November 2019. Retrieved 21 November 2021.
  36. ↑ "Farewell flight and final goodbye to the KDC-10 of the Royal Netherlands Air Force". aviacion.com. 5 October 2021. Retrieved 21 November 2021.
  37. 1 2 van der Mark 2019 , p. 7
  38. ↑ "Frequently Asked Questions". Omega Air Refueling. Archived from the original on 28 July 2011. Retrieved 27 August 2011.
  39. ↑ "KDC-10 Air Refueling Tanker Aircraft". Global Airtanker Service. Archived from the original on 4 July 2008. Retrieved 19 September 2010.
  40. ↑ "KDC-10: Primary Options". Global Air Tanker Services. Archived from the original on 28 August 2008. Retrieved 25 February 2008.
  41. ↑ "RAAF Hornets Participate in Red Flag Alaska" Air Forces Monthly (Key Publishing), Issue 282, September 2011, pp. 37. ISSN   0955-7091. Retrieved: 30 September 2011.
  42. ↑ "Too Big for Its Own Good: Why a MD-11 Based Tanker Was Never Built". 8 January 2016.
  43. ↑ "MMF Background Paper" (PDF). Airbus Group, retrieved from an Archive.today capture made on 17 Jul 2017 22:36:58 UTC. Archived from the original (PDF) on 17 July 2017. Retrieved 1 August 2021.
  44. ↑ "Dutch air force scraps DC-10 transport". flightglobal.com. Retrieved 22 November 2021.
  45. ↑ "McDonnell Douglas KC-10A 82-0190." Aviation Safety Network Database. Retrieved: 19 September 2010.
  46. ↑ Balik, Roland (26 April 2022). "AMC Museum receives USAF's first KC-10A Extender". U.S. Air Force Expeditionary Center. Retrieved 1 March 2024.
  47. ↑ "KC-10A Extender, Boeing". March Field Air Museum In Riverside, CA. 11 September 2001. Retrieved 1 March 2024.
  48. ↑ "McDonnell Douglas KC-10A Extender". National Museum of the United States Air Force™. 15 April 2024. Retrieved 18 April 2024.
  49. 1 2 Steffen 1998, p. 107.
  50. ↑ Lednicer, David. "The Incomplete Guide to Airfoil Usage". m-selig.ae.illinois.edu. Retrieved 16 April 2019.
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