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Antonov An-70

From Alfawiki
Antonov Design Bureau
IndustryAerospace, Defense
Founded1946
FounderOleg Antonov
Headquarters
Kyiv
,
Ukraine
ProductsAircraft, including Antonov An-70


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The Antonov An-70 (Ukrainian: Антонов Ан-70) is a medium-range military transport aircraft powered by four engines, notable for being the first to fly exclusively with propfan propulsion. Conceived in the late 1980s by the Antonov Design Bureau, it was intended to succeed the aging An-12 transport model. The initial prototype's first flight occurred in December 1994 over Kyiv, now part of independent Ukraine. Shortly thereafter, the prototype was involved in a mid-air collision. To continue flight testing, a second prototype was constructed. Both were manufactured at the Kyiv Aircraft Production Plant.

Following the dissolution of the Soviet Union in the early 1990s, development became a collaborative effort between Russia and Ukraine. Russia’s inconsistent support and a shrinking market complicated progress. Attempts to commence serial production have seen limited achievements. Some Western European nations, including Germany, evaluated the aircraft for procurement but ultimately many opted not to proceed.

Concept and initial flight testing

The An-70’s development roots date back to the mid-1970s when the Antonov Design Bureau initiated preliminary designs for a replacement of the four-engine turboprop An-12.[1] By the 1980s, the Soviet Armed Forces sought a modern replacement for the An-12 that would complement the jet-powered Ilyushin Il-76. In 1987, emphasizing enhanced air mobility, the Ministry of Defence outlined requirements for an aircraft capable of rapid loading, operation from short and unprepared runways, transporting up to 300 soldiers, and delivering favorable operational economics.[2][3][4] The contract initiating work on the An-70 was signed in May 1989;[5] and Antonov commenced advanced design efforts that same year.[3] After the Soviet Union collapsed, Russia and Ukraine agreed in June 1993 to jointly develop the An-70, with Russia expected to provide about 80% of funding.[6] Subsequently, twenty organisations across former Soviet states committed to cooperative development, marketing, and support of the aircraft.[7]

Plans were made to produce the aircraft in series at both the Kyiv Aircraft Production Plant—later renamed Antonov Serial Production Plant—and at Russia’s Samara Aircraft Production Plant (reorganised as Aviakor). Early on, Russia’s hesitation led Uzbekistan to attempt establishing final assembly at Tashkent’s aviation plant where wings and Il-76 components were manufactured; this effort was unsuccessful.[4] Construction of the first prototype began in Kyiv in 1991.[6] Initially slated for a late 1992 maiden flight, delays due to financial constraints and design challenges pushed this back to 1994. The weakened national currency hindered payments for components—especially Russian-made parts—and affected workers’ wages.[8] Additionally, numerous non-critical design and manufacturing issues discovered during ground tests required extended corrections. Ultimately, the first flight occurred on 16 December 1994.[7]

File:Antonov An-70, Antonov Design Bureau AN1744931.jpg
The initial An-70 prototype in November 1994

Piloted by a crew of seven, the aircraft performed a brief takeoff from Svyatoshino Airfield in Kyiv. This marked the inaugural flight of an aircraft powered solely by propfan engines.[4] Adverse weather over Antonov’s facilities and test airspace shortened the flight duration and limited altitude to 2,000 m (6,600 ft); during this time, basic system checks were conducted at 450 m (1,480 ft) altitude. After less than thirty minutes airborne, it landed safely at Antonov’s test center at Hostomel.[7][9] Post-flight inspections revealed gearbox issues with the engines which grounded the plane for eight weeks while repairs were made.[10]

Flight testing was planned to last three months at Hostomel before relocating to Moscow’s Gromov Flight Research Institute in Zhukovsky.[9] However, on its fourth flight on 10 February 1995, the first prototype was lost after an unexpected deviation led to a collision with an An-72 chase plane. The resulting crash caused a fatal fire that killed all seven crew members.[11] Initial suspicions pointed toward technical faults but investigations later attributed the accident to pilot error.[10]

Following this tragedy, Antonov converted their static test airframe into a flying prototype fitted with updated flight control systems.[12] The second prototype was unveiled in Kyiv in December 1996 and undertook its maiden flight on 24 April 1997 from Svyatoshino Airfield. This sortie lasted approximately 31 minutes;[13] other sources claim it took off from Hostomel for a 26-minute flight.[14] During this flight, repeated malfunctions of the flight control system forced test pilot Oleksandr Halunenko to manually land; his skill earned him Ukraine’s highest honor as Hero of Ukraine.[15] By then, expenditures on development had surpassed US$2.5 billion with an additional $200 million projected for production preparation. Serial manufacturing was anticipated to begin by 1999 with an output rate of 20–25 units annually. Both Russian and Ukrainian air forces reportedly planned long-term acquisitions of approximately 500 and 100 aircraft respectively.[16][17] On 27 January 2001, during cold-weather trials, this second prototype suffered severe damage after a crash landing following takeoff.[18][19]

Western assessment

During the early 1990s, the An-70 was evaluated but ultimately rejected as a candidate for the European Staff Requirement (ESR) under the Future Large Aircraft (FLA) initiative. This programme aimed to develop a transport aircraft sized and capable between the Lockheed Martin C-130J and the McDonnell Douglas C-17, intended to succeed the C-130 Hercules. Nevertheless, in October 1997, Volker Rühe, then German Defence Minister, expressed interest in exploring whether the An-70 could serve as the foundation for the FLA. This consideration was driven by Germany's strategic goal of fostering industrial cooperation and strengthening political relations with Eastern European nations. By December 1997, France, Germany, Russia, and Ukraine reached an agreement to jointly assess the An-70’s suitability for the FLA programme.

Antonov introduced a "westernised" variant named the An-7X. The German government assigned DaimlerChrysler Aerospace (DASA) with the task of examining whether this aircraft met the ESR for a shared tactical airlifter. Airbus contributed relevant data to DASA, which was subsequently validated through wind-tunnel experiments. Findings from a 1999 DASA report indicated that while the An-70 complied with ESR criteria and could be westernised, significant modifications were necessary in critical areas, accompanied by associated risks. These included incorporating full authority digital engine control, redesigning the cockpit entirely, installing a new flight-control system computer, enabling in-flight refuelling capabilities, and adapting the rear cargo door for paratrooper deployment. Additionally, DASA suggested revising manufacturing processes for carbon-fiber-reinforced polymer components and identified current fuselage production methods as economically inefficient. To oversee these westernisation efforts, German, Ukrainian, and Russian enterprises established a joint venture named "AirTruck."

Politically motivated preferences led the German government to favour the An-70. In an independent evaluation by Germany's Ministry of Defence focusing on the An-7X, this aircraft was reportedly regarded as superior to Airbus Military's A400M. According to AirTruck, estimates from the Defence Ministry indicated that the An-7X would be approximately 30 percent less costly than its competitor, offer substantial industrial advantages with significant German workshare, and possess technical superiority primarily due to its advanced propfan engines; however, an official spokesperson from the Ministry denied any definitive conclusions had been drawn. Conversely, DASA showed a preference for the A400M and declined to act as prime contractor should the An-70 be selected. Meanwhile, several prospective FLA participants—including Belgium, France, Italy, Portugal, Spain, Turkey, and the UK—projected a combined requirement of up to 288 aircraft; Russia and Ukraine themselves planned acquisitions totaling around 210 An-70s. Other contenders considered for the FLA included both the C-17 and C-130J.

By April 2000, despite being its strongest advocate for the An-70, Germany declared its commitment to procure whichever aircraft was chosen by partner nations. Ultimately, the A400M was selected for the FLA programme. Had the An-70 been chosen instead, Airbus would have been responsible for manufacturing half of each aircraft produced.

2001 incident and subsequent controversies

In December 1999, the Russian administration announced plans to acquire 164 aircraft by the year 2018. Meanwhile, in October 2000, Ukrainian authorities assessed their need at approximately 65 aircraft. By this time, the Russian government had granted production rights to the Omsk-based Polyot facility, favoring it over Aviakor and Aviastar, located in Samara and Ulyanovsk respectively. The Kyiv Aircraft Production Plant was anticipated to deliver the initial aircraft in 2003, with Polyot following in 2004. As the An-70 flight testing neared completion at the end of 2000, it was expected that both the Russian and Ukrainian Defence Ministries would authorize mass production early in 2001. However, on 27 January 2001, during cold weather trials in Omsk, the second An-70 prototype suffered a belly landing after losing power in two engines at takeoff, resulting in severe damage. Out of 33 individuals onboard, four sustained injuries. Antonov managed to salvage and repair the damaged aircraft, although funding for the program remained insufficient.

File:Antonov An-70, Antonov Design Bureau AN2232181.jpg
An-70 in flight

By January 2002, preparations for full-scale production began as Russia confirmed inclusion of the aircraft within its nine-year military budget; Ukraine had already placed an order for five units. Despite this commitment, signs emerged indicating waning Russian interest in the An-70 project. For instance, in February 2002, Russia’s Defence Ministry refrained from contributing to development expenses during that period and simultaneously withdrew military personnel from testing activities. The following year saw senior Russian Air Force figures openly criticizing the project; General Vladimir Mikhaylov, then Commander-in-chief of the Russian Air Force, dismissed it as underdeveloped and described the aircraft as "dangerous," excessively heavy, and costly. Rumors circulated suggesting Russia might soon abandon the initiative; nonetheless, in May 2003, President Vladimir Putin assured his Ukrainian counterpart of continued Russian support.

In response to uncertainties surrounding Russian backing, Antonov sought alternative industrial partnerships. In September 2003, a memorandum of understanding was signed with China Aviation Industry Corporation II to explore potential joint transport aircraft development. Russia’s ambivalence was further underscored by its Defence Ministry’s decision not to allocate funds for acquiring the An-70 for its air force in the near term; instead, investment was directed toward enhancing the Il-76MF. Following Ukraine’s Orange Revolution in late 2004 and its overt pursuit of NATO membership, political enthusiasm for the project diminished significantly. In April 2006, General Mikhaylov publicly declared Russia’s withdrawal from the program, although this lacked formal confirmation from Russian governmental authorities. Reportedly a vocal critic of the An-70, Mikhaylov questioned the reliability of its D-27 engines and advocated for favoring the Il-76MF variant, which was estimated to cost roughly half as much as the An-70. Up to that point, Russia had contributed approximately 60 percent of the estimated $5 billion invested into the program.

Further Progress

The project faced inconsistent engagement from the Russian side, as Russia had accumulated unpaid debts related to the programme for three consecutive years up to 2009. Various sources noted that the August 2008 conflict between Russia and Georgia underscored the necessity for a transport aircraft akin to the An-70, featuring a roomy cargo hold and the capability to operate from unprepared runways. Consequently, in August 2009, both nations consented to recommence development work on the An-70. Ukraine proceeded with flight testing of the single prototype while enhancing its avionics, sensors, and propulsion systems. Reports indicated that the Ukrainian Air Force expected delivery of its first two An-70s in 2011 and 2012, and Volga-Dnepr Airlines had signed a memorandum of understanding with Antonov for five commercial-grade An-70T aircraft. Additionally, Russia’s national armament plan for 2011–2020, issued in December 2010, included a requirement for 60 An-70 units.

In late July 2010, Antonov temporarily halted flight testing to implement upgrades on the aircraft. Following extensive modifications—such as updated avionics that reduced the flight crew size from five to four and redesigned propellers aimed at enhancing reliability and lowering noise—the second An-70 prototype resumed flying on 27 September 2012 and was showcased at Kyiv’s Aviasvit XXI airshow. During that year, Russian and Ukrainian authorities agreed on division of production responsibilities: Antonov in Kyiv would manufacture the wings, tail assemblies, and engine nacelles; meanwhile, the Kazan Aircraft Production Association (KAPO) in Kazan, Russia, was assigned fuselage construction, final assembly, and flight testing duties. Additional key components were sourced from Novosibirsk, Ulyanovsk, and Voronezh. By December 2012, assembly of the first production aircraft’s fuselage was reportedly finished.

The testing phase spanned from September 2012 until April 2014, culminating in successful state acceptance trials. Throughout this period, approximately 120 flights were completed totaling around 220 hours, with much of the certification process managed by Ukrainian experts and officials. Despite its inclusion in Russia’s state rearmament programme, Russia withdrew from the project in November 2012—citing slow progress—with this withdrawal becoming public knowledge only in April 2013. Reports suggested that Russia’s exit was influenced not only by Ukraine’s EU alignment but also by political maneuvering within Russian government circles linked to Ilyushin, aimed at promoting purchase of the Il-476—a re-winged version of the Il-76. In total, state tests accumulated about 735 flights and nearly 930 flight hours.

Following Russia’s annexation of Crimea, Ukraine announced in April 2014 a cessation of all military-technical cooperation with Russia. In August that year, a Ukrainian court ordered the Russian Defence Ministry to fulfill outstanding financial obligations owed to Antonov. By March 2015, Russia’s Defence Ministry officially excluded the An-70 from its state procurement plans and asserted that Ukraine had effectively withdrawn from pre-existing military and defence agreements by continuing aircraft development without Russian involvement. Consequently, Moscow indicated it would seek reimbursement of approximately 2.95 billion rubles expended on the An-70 project.

Design

The An-70 is a high-wing monoplane powered by four unique propfan engines. Developed by the Progress Design Bureau, each of the D-27 engines delivers 13,800 shp, with potential uprating to 16,000 shp. These engines drive the SV-27 contra-rotating scimitar propellers produced by Aerosila, featuring eight blades on the forward propeller and six on the rear.[20]: 20  The slipstream generated by these propfan units flows over the aircraft’s supercritical wing, which is equipped with double-slotted flaps along its trailing edges to enhance lift at lower speeds.[21]: 58  Between 2010 and 2012, modernization efforts included engine upgrades such as integrating FADEC and increasing the spacing between the two propellers.[22][23]: 16  The An-70 cruises at approximately 750 km/h (400 kn) while operating at altitudes ranging from 8,600 to 9,600 m (28,200 to 31,500 ft). In 1997, Antonov stated that its design maximum speed reached 850 km/h (460 kt, or Mach 0.8), a figure that favorably compares to the Mach 0.77 speed of the larger turbofan-powered C-17.[20]: 21 [21]: 58  According to assessments by DASA, these propfan engines provide a 10 percent fuel efficiency improvement over traditional turboprops.[24]: 130 

File:Antonov AN-70 at Paris Air Show 2013 4.jpg
The D-27 propfan

Reflecting typical Soviet-era design philosophy, the An-70 was engineered as a transport aircraft capable of operating from unprepared runways. In its short take-off and landing configuration, it can depart from a 600 m (2,000 ft) dirt runway carrying 25 tonnes (55,000 lb) of cargo and cover distances up to 3,000 km (1,900 mi). Alternatively, with a payload of 35 tonnes (77,000 lb), it can achieve the same range when taking off from a paved runway of 1,800 m (5,900 ft) length. For missions prioritizing payload over range, the An-70 is capable of transporting 47 tonnes (104,000 lb) across 1,500 km (930 mi), while for extended range requirements, it can carry 17 tonnes (37,000 lb) up to 8,000 km (5,000 mi).[21]: 59 [25] Under special low-g take-off conditions, it can airlift a fully loaded 47 tonnes (104,000 lb) T-80U main battle tank for distances reaching 3,000 km (1,900 mi).[23]: 14  The pressurized cargo compartment measures approximately 4.0 m (13.1 ft) in width and 4.1 m (13 ft) in height, extending 18.6 m (61 ft) from the cockpit area to the cargo ramp; including the ramp, total length reaches 22.4 m (73 ft).[20]: 21  Although the turbofan-powered Il-76 offers a larger payload capacity and longer ramp length, its cargo cross-section is smaller than that of the An-70.[23]: 15  Cargo handling is facilitated by four electrically operated hoists allowing independent loading operations. Additionally, a modular floor system can be installed swiftly to accommodate either 300 troops or 200 wounded personnel arranged across two decks.[2][21]: 59 

The An-70 incorporates extensive use of titanium and composite materials akin to designs like the An-124, aiming to minimize weight while enhancing structural durability. Approximately one-quarter of its airframe consists of carbon-fiber composites mainly applied to control surfaces and tail components, with aluminum and steel alloys comprising the remainder.[21]: 59–60  The aircraft is engineered for a service life of 45,000 flight hours over roughly 15,000 sorties.[24]: 133  Prototype models featured a fly-by-wire flight control system combining three digital channels with six analog ones; production variants were anticipated to adopt a four-channel digital fly-by-wire configuration.[24]: 133 [21]: 60  Flight data and system status are primarily presented to pilots via six large multifunction CRT screens, supplemented by traditional electro-mechanical gauges and head-up displays. A flight engineer station was also included in prototype cockpits.[21]: 60 

Variants

File:Antonov An-112KC.jpg
Proposed An-112KC variant
An-70T
This model is a civilian adaptation of the An-70, presented without any suffix.[22]
An-70T-100
Designed as a lighter variant of the An-70T for commercial applications, this version features two D-27 propfan engines and a simplified landing gear system. It was planned to transport 30 t (66,000 lb) over 1,000 km (620 mi), or carry 20 t (44,000 lb) across 4,300 km (2,700 mi).[21]: 60 
An-7X
Targeted at the Western European market, this was a proposed iteration of the An-70.[24]: 129 
An-77
Introduced in July 2017 as a collaborative project between Ukraine and the United States, this updated An-70 variant aims to bridge the payload gap between the 21-metric-ton (23-short-ton) C-130 and the 76-metric-ton (84-short-ton) C-17.[26][18] Additionally, it has been considered as a potential replacement for the An-12 and Il-76 military transport aircraft.Template:Fix/category[citation needed] At the Eurasia Airshow in April 2018, Antonov revealed plans to collaborate with Turkey's Turkish Aerospace Industries (TAI) on modernizing the An-77 to meet contemporary standards.[27]
An-112KC
This concept featured an aerial refueling tanker variant of the An-70 equipped with two jet engines developed by U.S. Aerospace in partnership with Antonov, intended for the U.S. Air Force's KC-X program.Cite error: The opening <ref> tag is malformed or has a bad name Despite the proposal, it was declined by the USAF,Cite error: The opening <ref> tag is malformed or has a bad name and subsequent appeals were dismissed.Cite error: The opening <ref> tag is malformed or has a bad nameCite error: The opening <ref> tag is malformed or has a bad name
An-170
A heavy-lift derivative characterized by an extended fuselage and increased wingspan.[28] It would be powered by the Progress D-227 engine, an enhanced version of the Progress D-27, delivering between 16,000–17,000 hp (12,000–13,000 kW).[29]
An-171
Planned as a maritime patrol adaptation based on the An-170 platform.
An-188
This variant's development was announced at the 2015 Paris Air Show.Cite error: The opening <ref> tag is malformed or has a bad name It is envisioned as a heavy-medium transport aircraft powered by four jet engines, featuring a modernized NATO-compatible western cockpit, slightly larger wings with winglets, and equipped for aerial refueling.Template:Fix/category[citation needed] The An-188 aims to fill the niche between the C-130 and C-17, directly competing with the A400M. Plans include offering both western engine options alongside the D-27 to appeal to western markets and reduce reliance on eastern suppliers.Cite error: The opening <ref> tag is malformed or has a bad name In May 2018, during the Eurasia Airshow in Antalya, Turkey, Ukroboronprom announced a joint production agreement between Ukraine and Turkey for this aircraft.Cite error: The opening <ref> tag is malformed or has a bad name

Operators

Template:UKR

Specifications (An-70)

Template:Aircraft specs

See also

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References

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  3. ↑ 3.0 3.1 Cite error: Invalid <ref> tag; no text was provided for refs named Phoenix
  4. ↑ 4.0 4.1 4.2 Cite error: Invalid <ref> tag; no text was provided for refs named Heir
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named ec court
  6. ↑ 6.0 6.1 Cite error: Invalid <ref> tag; no text was provided for refs named Palchikov
  7. ↑ 7.0 7.1 7.2 Cite error: Invalid <ref> tag; no text was provided for refs named Rybak
  8. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  9. ↑ 9.0 9.1 Cite error: Invalid <ref> tag; no text was provided for refs named FI_maiden_flight
  10. ↑ 10.0 10.1 Cite error: Invalid <ref> tag; no text was provided for refs named 1995crash
  11. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  12. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  13. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  14. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Drive20220504
  16. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  17. ↑ Lua error in Module:Citation/CS1/Configuration at line 2123: attempt to index field '?' (a nil value).
  18. ↑ 18.0 18.1 Cite error: Invalid <ref> tag; no text was provided for refs named aa20170717
  19. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Second_Crash
  20. ↑ 20.0 20.1 20.2 Cite error: Invalid <ref> tag; no text was provided for refs named Completing_Assembly
  21. ↑ 21.0 21.1 21.2 21.3 21.4 21.5 21.6 21.7 Cite error: Invalid <ref> tag; no text was provided for refs named Fricker
  22. ↑ 22.0 22.1 Cite error: Invalid <ref> tag; no text was provided for refs named first next
  23. ↑ 23.0 23.1 23.2 Cite error: Invalid <ref> tag; no text was provided for refs named UDS
  24. ↑ 24.0 24.1 24.2 24.3 Cite error: Invalid <ref> tag; no text was provided for refs named Heading_West
  25. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named FlightglobalUkraineGivesApproval
  26. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named An-77
  27. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Scramble082018
  28. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named WhoKnows
  29. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Motherland201409

External links

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