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The [[twinjet]] has a [[carbon fibre reinforced polymer]] wing and was to be powered by [[Aviadvigatel PD-14]] turbofans or [[Pratt & Whitney PW1000G]] engines.
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The standard MC-21-300 has a capacity of 132–163 passengers in a two-class configuration and 165–211 in a single class, and a range up to {{cvt|6,000|-|6,400|km|nmi mi}}.
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By July 2018, it had received 175 firm orders.
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The phase will extend the mass, centering, speed and altitude envelope.<ref>{{Cite press release |url= http://www.uacrussia.ru/en/press-center/news/korporatsiya-irkut-pristupila-ko-vtoromu-etapu-letnykh-ispytaniy-samoleta-ms-21 |title= Irkut Corporation starts the second stage of MC-21 flight tests |publisher= [[United Aircraft Corporation]] |date= 13 September 2017 |access-date= 28 December 2019 |archive-date= 4 June 2020 |archive-url= https://web.archive.org/web/20200604004500/https://www.uacrussia.ru/en/press-center/news/korporatsiya-irkut-pristupila-ko-vtoromu-etapu-letnykh-ispytaniy-samoleta-ms-21 |url-status= live }}</ref>
In October 2017, the first prototype flew from [[Irkutsk Aviation Plant]] to Moscow [[Ramenskoye Airport]] to continue testing at the [[Gromov Flight Research Institute]], a 6-hour flight over {{cvt|4,500|km|nmi mi}} at {{convert|33,000|ft|m}}.<ref name=Flight17oct2017>{{cite news |url= https://www.flightglobal.com/news/articles/irkut-conducts-long-mc-21-flight-to-gromov-test-cent-442238/ |title= Irkut conducts long MC-21 flight to Gromov test centre |date= 17 October 2017 |author= David Kaminski-Morrow |work= Flightglobal |access-date= 18 October 2017 |archive-date= 18 October 2017 |archive-url= https://web.archive.org/web/20171018190439/https://www.flightglobal.com/news/articles/irkut-conducts-long-mc-21-flight-to-gromov-test-cent-442238/ |url-status= live }}</ref>
The [[flight test]] programme started on 2 November with a 3-hour flight reaching {{convert|39,400|ft|m}}.<ref>{{cite news |url= https://www.flightglobal.com/news/articles/mc-21-begins-flight-test-programme-from-gromov-442860/ |title= MC-21 begins flight-test programme from Gromov |date= 3 November 2017 |author= David Kaminski-Morrow |work= Flight Global |access-date= 3 November 2017 |archive-date= 7 November 2017 |archive-url= https://web.archive.org/web/20171107030831/https://www.flightglobal.com/news/articles/mc-21-begins-flight-test-programme-from-gromov-442860/ |url-status= live }}</ref>
Before being flown to Moscow, 20 flights were conducted in Irkutsk.<!--<ref name=Flight11nov2017/>-->
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==== Pre-sanctions plans ====
[[Aeroflot]] expected to lease 50 MC-21-300s from [[Rostec|Aviakapital]] for 12 to 18 years and a monthly [[aircraft lease|lease]] of less than $437,282 each.<ref name=Flight4jun2018/> By 2018, they were to be delivered from the first quarter of 2020 to the third quarter of 2026, with [[European Aviation Safety Agency|EASA]] certification targeted for early 2021.<ref name=Flight4jun2018/>
Powered by [[Pratt & Whitney PW1000G|PW1400Gs]] or possibly [[Aviadvigatel PD-14|PD-14s]] for the second half, Irkut guaranteed less than {{cvt|9,865|kg}} [[fuel economy in aircraft|fuel burn]] on a {{cvt|1,750|nmi|km mi}} route with a {{convert|14|kn|km/h mph|adj=on}} tailwind.<ref name=Flight4jun2018/>
They were guaranteed to reach 2,100h and a [[dispatch reliability]] of 96% for the first year, rising to 2,900h and 97% in the second year then 3,750h and 98.5% in the third year.<ref name=Flight4jun2018>{{cite news |url= https://www.flightglobal.com/news/articles/aeroflot-outlines-performance-expectations-for-mc-21-449175/ |title= Aeroflot outlines performance expectations for MC-21s |date= 4 June 2018 |author= David Kaminski-Morrow |work= Flight Global |access-date= 5 June 2018 |archive-date= 21 April 2019 |archive-url= https://web.archive.org/web/20190421092616/https://www.flightglobal.com/news/articles/aeroflot-outlines-performance-expectations-for-mc-21-449175/ |url-status= live }}</ref>
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The [[fuselage]] of the MC-21 is mostly made of lightweight [[aluminium–lithium alloy]], which accounts for 40% of the airframe's structural weight.<ref>{{cite news |last1=Karnozov |first1=Vladimir |title=Russia to adopt composite wing and aluminium fuselage for next narrowbody |url=https://www.flightglobal.com/news/articles/russia-to-adopt-composite-wing-and-aluminium-fuselage-for-next-narrowbody-219036/ |work=Flightglobal |date=5 November 2007}}</ref>
It is {{cvt|11|cm|in}} wider than the A320/C919 and {{cvt|27|cm|in}} wider than the 737, for a {{cvt|24|in|cm|0|order=flip}} aisle allowing passing others or a trolley.<ref name=Leeham3Jan2018>{{cite news |url= https://leehamnews.com/2018/01/03/united-aircraft-comac-goes-flying/ |title= United Aircraft's and COMAC's eventful year |author= Bjorn Fehrm |date= 3 January 2018 |work= Leeham |access-date= 3 January 2018 |archive-date= 2 March 2019 |archive-url= https://web.archive.org/web/20190302195006/https://leehamnews.com/2018/01/03/united-aircraft-comac-goes-flying/ |url-status= live }}</ref>
Its {{cvt|79.25|t|lb}} [[MTOW]] is the same as the almost 5 m (16.5 ft.) shorter A320neo, and is {{cvt|3|t|lb}} lighter than the almost {{cvt|3|m}} shorter 737-8, for similar two-class layouts of 162 to 165 while the 737-8 and A320neo have {{cvt|200|nmi|km mi}} more range.<ref name=AvWeek2jan2018/>
===Engines===
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! 2-class range
| {{cvt|6,400|km|nmi mi}}
| {{cvt|6,000|km|nmi mi}}
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