Antonov An-70

An-70
Role Military transport aircraft
Design group Antonov
Built by Aviant
First flight 16 December 1994
Status completed state tests
Produced 1991–1996
2012–2015
Number built 2 prototypes
Program cost US$5 billion (2006)[1]
Unit cost
US$67 million (2015)[2]

The Antonov An-70 is a four-engine medium-range transport aircraft, and the first large aircraft to be powered by propfan engines. It was developed in the late 1980s by the Antonov design bureau to replace the obsolete An-12 military transport aircraft. However, the dissolution of the Soviet Union prevented the mass production of the type. The maiden flight of the first prototype took place on 16 December 1994 in Kiev, now independent Ukraine. Within a year the prototype plane had suffered a mid-air collision. A second airframe was produced and tests continued but numerous further attempts to start production have been unsuccessful.

Development

Origins and early testing history

The origins of the An-70 can be traced back to the mid-1970s, when Antonov Design Bureau (OKB) began preliminary design work on a successor for the An-12 turboprop-powered transporter.[3] The Soviet Armed Forces, by the 1980s, were looking for a replacement for the An-12 and a complement to the Ilyushin Il-76; in 1987, the Ministry of Defence, with a new emphasis on air mobility, specified an aircraft with a quick loading time, the ability to operate from short unprepared airfields, could carry up to 300 troops, and have good operating economy.[4][5][6] The initial contract for work on the An-70 was concluded in May 1989;[7] Antonov began advanced design work on the new aircraft during the same year.[5] After the collapse of the Soviet Union, in June 1993, the Russian and Ukrainian governments agreed to jointly develop the An-70, with 80 percent of the funding expected to come from Russia.[8] The following year, twenty companies and organisations from the former Soviet Union agreed to jointly develop, market and support the aircraft.[9]

There were plans to establish serial production of the model at the Kiev Aircraft Production Plant, which was associated with but separate from the Antonov Design Bureau, and at the Samara Aircraft Production Plant (later reorganised as Aviakor) in Samara, Russia. At one stage during early development, Russia was showing reluctance at supporting the development of the An-70, and so Uzbekistan sought, unsuccessfully, to establish a final assembly plant in the capital at the Tashkent Aircraft Production Plant, where the production of the An-70's wings and the Il-76 were taking place.[6] Construction of the first prototype had started in Kiev in 1991.[8] The maiden flight of the aircraft had originally been scheduled for late 1992. However, due to financing and design issues, this was pushed back until 1994. In particular, the weakened national currency diminished the firm's ability to pay for the aircraft's components, especially those sourced from Russia,[10] and workers' salaries. In addition, engineers discovered numerous design and manufacturing deficiencies during the final ground checks, the majority of which were non-critical yet necessitated lengthy corrections. In the end, the aircraft made its maiden flight on 16 December 1994.[9]

The first An-70 prototype in November 1994

Crewed by a seven-man team, the first aircraft performed a short take off from Svyatoshino Airfield, Kiev. This was the first flight of an aircraft that was powered only by propfans.[6] Due to worsening weather conditions over Antonov's headquarters and the flight test area in Kiev, the flight was cut short, and the flight ceiling was capped at 2,000 m (6,500 ft). The crew took the aircraft to a height of 450 m (1,475 ft), while performing basic checkouts of the prototype's systems. After having been airborne for less than half an hour, the aircraft landed at Antonov's flight test facility at Gostomel.[9][11] During the flight, engineers identified problems with the engine gearboxes, and so the aircraft was grounded for eight weeks while the issues were fixed.[12]

Originally, the aircraft was to conduct flight tests at Gostomel for three months before transferring to the Gromov Flight Research Institute in Zhukovsky, near Moscow.[11] However, the first prototype was lost when it was making its fourth flight on 10 February 1995. During the flight, the aircraft suffered a sudden deviation from its intended flightpath and collided with the An-72 chase plane before spiralling into the ground, erupting into flames; the test crew of seven were killed.[13] Although there were initial allegations of technical issues with the aircraft, it was later determined that the crash had been caused by human error.[12]

Antonov subsequently converted the static-test prototype into a flying prototype equipped with a modified flight-control system.[14] The second airframe was rolled out in December 1996 in Kiev, before making its first flight on 24 April 1997 from Svyatoshino Airfield, during which the aircraft was airborne for 31 minutes;[15] according to Jane's, however, the aircraft had taken off from Gostomel for a 26-minute flight.[16] By this time, more than US$2.5 billion had been spent on the programme, with a further $200 million to be spent to prepare the aircraft for production, which was expected to have started in 1999 with 20–25 aircraft produced annually. The Russian and Ukrainian Air Forces reportedly had long-term plans to procure 500 and 100 aircraft, respectively.[17][18] The second airframe was severely damaged during cold weather testing on 27 January 2001 in a crash landing after take-off.[19]

Western evaluation

In the early 1990s, the An-70 was unsuccessfully considered as a platform to meet the European Staff Requirement (ESR) for the Future Large Aircraft (FLA) programme; the programme envisaged the development of a transport aircraft that is midway in size and capability between the Lockheed Martin C-130J and the McDonnell Douglas C-17 to replace the C-130 Hercules. In October 1997, however, the German Defence Minister Volker Rühe announced his intention to study whether the An-70 could be the basis for the FLA. The decision arose out of the German government's objective of providing industrial aid to and thus enhancing political ties with Eastern Europe.[20][21] In December 1997, France, Germany, Russia and Ukraine agreed to evaluate the An-70 as a candidate for the FLA programme.[22]

Antonov proposed a "westernised" version of the An-70, the An-7X. The German government tasked DaimlerChrysler Aerospace (DASA) with the responsibility of evaluating the An-70 and assessing whether it would fulfill the ESR for a common tactical airlifter. DASA depended on data provided by Antonov and was not able to test-fly the aircraft themselves. However they conducted wind-tunnel tests and the results confirmed the data. According to the DASA study from 1999 the An-70 fulfilled the ESR, and that westernisation is possible, but work in key areas would have been necessary and risks existed. Areas identified include the introduction of full authority digital engine control, a completely new cockpit, a new flight-control system computer and in-flight refuelling capability, as well as modifications to allow paratroopers to be dropped from the rear cargo door. DASA recommended a change in the manufacturing method of the carbon-fiber-reinforced polymer components. Also the fuselage manufacturing-method was considered uneconomical. They were not able to assess the manufacturing of the wing because no data were available. German, Ukrainian and Russian companies had formed the joint-venture "AirTruck" to plan and manage the modifications needed to westernise the An-70.[23]

The German government, for political reasons, preferred the An-70-based solution. During a separate German Ministry of Defence evaluation of the An-7X, the aircraft was considered to be superior to the A400M designed by the military branch of Airbus. According to AirTruck, the An-7X was estimated to be 30 percent cheaper than its rival, provide industrial benefits as Germany would receive substantial workshare, and technically superior, due mainly to its new propfan technology.[24] Conversely, DASA preferred the A400M, and refused to be the prime contractor for the An-70 if it was to be chosen. In the meantime, Belgium, France, Italy, Portugal, Spain, Turkey and the UK, were tentative members of the FLA programme and were estimated to have a requirement for up to 288 aircraft; Russia and Ukraine themselves were looking to acquire 210 An-70s. Other contenders for the FLA were the C-17 and C-130J.[25][26] In April 2000, the German government, the strongest supporter of the An-70, stated that it was committed to buying the same aircraft as the other countries.[27] In the end, the A400M was chosen for the FLA project; had the An-70 been chosen, fifty percent of the aircraft would have been manufactured by Airbus.[22][28]

Disputes and 2001 incident

In December 1999, the Russian government outlined that it planned to purchase 164 aircraft by 2018. The Ukrainian government in October 2000 estimated that the country had a requirement for 65 aircraft.[29] In September 2000, Omsk-based Polyot won the government tender for the right to produce the aircraft, beating Samara-based Aviakor and Ulyanovsk-based Aviastar. Kiev's Aviant manufacturing plant was expected to produce the first aircraft in 2003, and Polyot, in 2004.[30] With the An-70 flight test programme having reached its final stages by the end of 2000, it was expected that the Russian and Ukraine Defence Ministries would approve of serial production at the start of 2001. On 27 January 2001, however, the second An-70 prototype made a crash landing on its belly after losing power in two engines on take-off during cold weather testing in Omsk, and was severely damaged. Four of the 33 people onboard were injured.[31] It looked as though the A400M was now going to have the market all to itself. Antonov recovered the crashed aircraft and repaired it in record time, but the project still lacked funding.[32][33]

In January 2002, preparations started on serial production as the Russian government affirmed that the aircraft was in the country's nine-year military budget; by now, Ukraine had already placed an order for five aircraft.[30] Despite the affirmation that the country was committed to the project, there were other indications that Russia had lost considerable interest in the An-70. In February 2002, for example, the Defence Ministry did not contribute towards the An-70's development costs for the period, and at the same time military experts were withdrawn from the test programme.[29] The following year, senior Russian Air Force officials publicly discredited the project; Commander-in-chief of the Russian Air Force, General Vladimir Mikhaylov, labelled it as undeveloped, and the aircraft as dangerous, too heavy and too expensive.[29] Indeed, there were rumours that Russia would soon abandon the project; however, in May 2003, Russian President Vladimir Putin reassured his Ukrainian counterpart that Russia was committed to the project.[29][34]

Nevertheless, Antonov looked elsewhere for an industrial partner. In September that year, the company signed a memorandum of understanding (MoU) with China Aviation Industry Corporation II that covered the possible joint development of transport aircraft. Russian ambivalence towards the An-70 was made evident when the Russian Defence Ministry did not allocate any funds in the near future towards the procurement of the aircraft for its air force. Instead, resources were dedicated towards the Il-76MF.[34] After the Orange Revolution in late 2004, and with Ukraine openly aiming for NATO membership, political will for the project evaporated.[1][35] In April 2006, General Mikhaylov announced that Russia was withdrawing from the project, although at the time there was no official confirmation from the Russian government itself. Mikhaylov had reportedly been a staunch opponent of the An-70, citing its unreliable D-27 engine, and had advocated for the adoption of the Il-76MF, which was estimated to cost half that of the An-70.[36] Russia had provided around 60 percent of the estimated $5 billion invested in the project to date.[1]

Subsequent development

Intermittent commitment from the Russian side plagued the project, as evident by the outstanding debt that Russia owed the programme for the three years through 2009.[37] According to various reports, Russia's conflict with Georgia in August 2008 highlighted the need for an airlifter in the class of the An-70, one that has a spacious cargo bay and the ability to operate from unpaved airstrips.[38]:15[39]:20–1 Consequently, in August 2009, both countries agreed to resume development of the An-70.[40][41]:86 Ukraine continued to pursue flight testing of the sole prototype while making upgrades to the aircraft's avionics, sensors and propulsion system. It was reported that the Ukrainian Air Force would take delivery of the its first two An-70s in 2011 and 2012; Volga-Dnepr Airlines had also signed an MoU with Antonov for five commercial-standard An-70Ts.[42] A requirement for 60 An-70s was included in Russia's 2011–2020 national armament programme when it was issued in December 2010.[41]:86–7

In late July 2010, Antonov suspended the flight test programme as the company prepared the aircraft to be modernised.[39]:21 After an extensive series of modifications, including revised avionics (which allowed the flight crew to be reduced from five to four) and changes to the aircraft's propellers to improve reliability and decrease noise, the second prototype An-70 flew again on 27 September 2012 and took part in the Aviasit XXI airshow in Kiev.[41]:86–8[43] During the same year, Russian and Ukrainian authorities agreed on the basic workshare of the production programme. Antonov in Kiev would now produce the wings, tail surfaces and engine nacelles. The KAPO factory in Kazan, Russia, would be responsible for the manufacture of the fuselage, the final assembly of the aircraft, and flight testing. Other major components would come from Novosibirsk, Ulyanovsk and Veronezh;[38]:16[41]:88–9[43] construction of the fuselage of the first production aircraft was reportedly complete in December 2012.[44]

The test programme would last from September 2012 until April 2014, when the aircraft passed state acceptance trials.[45] During that time, the An-70 conducted approximately 120 flights totalling 220 hours, with much of the certification effort carried out by Ukrainian specialists and officials. This is because, despite the aircraft's inclusion in Russia's state rearmament programme, Russia had withdrawn from the project in November 2012 reportedly due to slow progress, a fact that was disclosed only in April 2013.[46] According to a report, the withdrawal of Russia from the project was, apart from a response to the Ukrainian government's EU choices, was the result of political machinations by Russian government officials with links to Ilyushin to get the government to purchase the Il-476.[47] In total, the An-70 had conducted some 735 flights and having accummulated 930 hours during state tests.[48]

As a result of the Crimean crisis, the Ukrainian government, in April 2014, announced that it would halt all military-technical cooperation with Russia.[49] In August 2014, a Ukrainian court ordered the Russian Defence Ministry to make outstanding payments to Antonov.[7] In March 2015, Russia Defence Ministry declared that it is ruling out the An-70 for state procurement. It also declared that, as in their opinion, Ukraine has withdrawn from the military and defence agreements signed before the crisis between them by completing the aircraft without Russian involvement, it would request return of 2.95 billion rubles that Russian government had spent on An-70 project.[2] In January 2015, Ukrainian Defence Minister Stepan Poltorak signed an order signalling the official entry of the An-70 into service with the Ukrainian Air Force.[50]

Design

The An-70 is a monoplane with a high-mounted wing design that features four distinctive propfan engines. Designed by the Progress OKB, each of the D-27 engines is rated at 13,800 shp (which can be uprated to 16,000 shp), which is used to drive the SV-27 contra-rotating scimitar propellers designed by Aerosila; eight on the front propeller and six on the aft propeller.[51]:20 The propfan engines deliver slipstream to the supercritical wings that feature double-slotted trailing edges to provide high lift coefficients at low speeds.[52]:58 The modernisation of the aircraft during 2010–12 saw upgrades to the engines, including the incorporation of FADEC, and the further separation of the two propellers.[42][38]:16 The aircraft's cruise speed is 750 km/h (405 kt) at an operational altitude of 8,600 to 9,600 m (28,200 to 31,500 ft), with a claimed maximum speed of 850 km/h (460 kt, or Mach 0.8), which compares favourably with Mach 0.77 of the larger turbofan-powered C-17.[51]:21[52]:58 According to Antonov, the engines provide 20–30 percent fuel economy compared to turbojet engines.[53]

The D-27 propfans

Similar to many aircraft designs of the Soviet Union, the An-70 was designed as an airlifter that could operate from unprepared fields. In short take-off and landing (STOL) configuration, the aircraft could lift off from a 600 m (2,000 ft) dirt strip with 25 tonnes (55,000 lb) of cargo and fly for 3,000 km (1,900 mi). Otherwise, it could fly the same distance with 35 t (77,000 lb) of cargo if it took off from a 1,800 m (5,900 ft) paved runway. For a payload-heavy mission, the An-70 can haul 47 t (104,000 lb) of cargo for a range of 1,500 km (930 mi), but if range was essential, the aircraft can carry a load of 17 t (37,000 lb) over 8,000 km (5,000 mi).[52]:59[54] In exceptional circumstances, the An-70 subjected to lower-g take-offs, can airlift a 47-tonne (104,000 lb) T-80U main battle tank and fly it for 3,000 km (1,900 mi).[38]:14 The fully pressurised internal cabin measures 4 m (13 ft) wide and 4.1 m (13 ft) high, and has a length of 18.6 m (61 ft) from the front to the ramp; with the ramp included, the total cabin length is 22.4 m (73 ft).[51]:21 In comparison, the turbofan-powered Il-76 has a lower cross-sectional cargo area, but exceeds the An-70 in payload capability and ramp length.[38]:15 The An-70's cargo hold is serviced by four electrical hoists that facilitate autonomous cargo loading. A central floor can be rapidly installed for the accommodation of 300 soldiers or 200 injured personnel over two decks.[4][52]:59

Similar to the An-124, the An-70 design makes extensive use of titanium and composites to keep weight to a minimum and increase damage resistance. Approximately 25 percent of the airframe is made of carbon-fibre composites, which are primarily used on control surfaces and the tail assembly, while aluminium and steel alloys are used for the rest of the structure.[52]:59–60 The An-70's structural life is designed to be 45,000 hours over 15,000 flights.[23] The prototypes had a fly-by-wire (FBW) flight-control system (FCS) that comprised three digital channels and six analog channels; it was expected that production aircraft would have a four-channel digital FBW FCS.[23][52]:60 Aircraft and system information are mainly relayed to the pilot and co-pilot via six large multifunction CRT displays, with provisions for electro-mechanical instruments and head-up displays; a flight engineer position is also present on the prototypes.[52]:60

Variants

Proposed An-112KC variant
An-70T
A version of the An-70 sans suffix adopted for the civilian market.
An-70T-100
A proposed lighter version of the An-70T with two D-27 propfans and simplified landing gear for civilian use. The variant was intended to haul 30 t (66,000 lb) of cargo over a distance of 1,000 km (620 mi), or 20 t (44,000 lb) for 4,300 km (2,700 mi).[52]:60
An-7X
A proposed version of the An-70 intended for the Western European market.
An-112KC
A proposed aerial refueling version of the An-70, except with two jet engines from the team of U.S. Aerospace and Antonov for the U.S. Air Force's KC-X program.[55][56] The USAF rejected the proposal,[57] and the appeal was later dismissed.[58][59]
An-188
A program to develop this variant was launched at the 2015 Paris Air Show.[60] This variant will essentially be a four jet engine powered heavy-medium transport with modernized NATO- compatible western cockpit, slightly enlarged wings, winglets and aerial refueling capabilities.[61] The An-188 is intended to fill the gap between a C-130 and C-17 while being a direct competitor to the A400M. Plans include incorporating a western engine option (as well as a Ukrainian one) to appeal to western markets and reduce dependency on eastern markets.[62]

Operators

 Ukraine

Specifications (An-70)

Data from Butowski[41]:88–9

General characteristics

Performance

See also

Aircraft of comparable role, configuration and era

References

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  2. 1 2 "Минобороны исключило из госпрограммы вооружения АН-70". Izvestia (in Russian). 2 March 2015. Retrieved 2 March 2015.
  3. ↑ Sidorchik, Andrei (2 March 2015). "Реквием Ан-70: история самолёта, ставшего жертвой политики". Argumenty i Fakty (in Russian). Retrieved 9 July 2017.
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  7. 1 2 "Economic court in Kyiv decides to collect 30.9 million rubles from Russian Defense Ministry in favor of Antonov State Enterprise". Interfax-Ukraine. 27 August 2014.
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  10. ↑ Lenorovitz, Jeffrey M. (27 June 1994). "Money problems delay An-70 maiden flight". Aviation Week & Space Technology. New York: McGraw-Hill. 140 (26): 61.
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  15. ↑ "Antonov flies second An-70 prototype". Flight International. London, UK: Reed Business Information. 151 (4572): 5. 30 April – 6 May 1997. ISSN 0015-3710. Retrieved 16 September 2016. The flight, from the Antonov test base at Svyatoshino, near Kiev, in Ukraine, lasted for a total of 31 min.
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  22. 1 2 "Study of An-70 as FLA Candidate to Last Through Summer". Defense Daily. 1 May 1998. Retrieved 9 August 2015 – via HighBeam Research. (Subscription required (help)).
  23. 1 2 3 Doyle, Andrew (9–15 June 1999). "Heading West". Flight International. London, UK: Reed Business Information. 155 (4680): 129–134. ISSN 0015-3710. Retrieved 8 September 2016.
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  27. ↑ Condom, Pierre; Cook, Nick (1 May 2000). "Can Europe say no to the A400M?". Interavia Business & Technology – via HighBeam Research. (Subscription required (help)).
  28. ↑ "AMC rebuffs An-70 as basis of Future Large Aircraft project". Flightglobal. 27 May 1998. Retrieved 28 September 2011.
  29. 1 2 3 4 Butowski, Piotr (1 May 2003). "All change in Russia's airlifter contest". Interavia Business & Technology. Retrieved 30 June 2017 – via HighBeam Research. (Subscription required (help)).
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