Ilyushin Il-12
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| Il-12 | |
|---|---|
| |
| Ilyushin Il-12 of CSA Czech Airlines on scheduled service at Paris Orly Airport in 1957 | |
| Role | Transport aircraft |
| Manufacturer | Ilyushin |
| First flight | 15 August 1945 |
| Primary user | Aeroflot |
| Number built | 663 |
| Variants | Ilyushin Il-14 |
The Ilyushin Il-12 (NATO reporting name "Coach") was a Soviet twin-engine cargo aircraft, developed in the mid-1940s for small and medium-haul airline routes and as a military transport.
Design and development
The Il-12 was developed as a private venture by the Ilyushin Design Bureau from autumn 1943 and was intended as a replacement for the Lisunov Li-2, a license-produced version of the Douglas DC-3. The new aircraft followed a classical layout for a twin-engine transport, with a metallic structure, monoplane wings, a conventional tail section. One major improvement over the Li-2 design was the tricycle landing gear, which allowed better visibility when taxiing and landing. Initially the Il-12 was designed for 29 passengers in a pressurized fuselage, with projected maximum range is assumed of 5,000 kilometers at a cruising speed 400 kph. The aircraft was to use four M-88B engines already proven in use on the Ilyushin Il-4.
However, during development, the M-88B engines had to be replaced by two ACh-31 diesel engines (each producing 1,500 hp). The plans for a pressurized fuselage were abandoned and the number of passengers reduced to 27. The Il-12 made its maiden flight on 15 August 1945.[1] It was soon decided to re-engine the aircraft with Shvetsov ASh-82 radial engines with the revised aircraft flying on 9 January 1946.[1]
The Il-12 was found to have problems with vibration during testing, having poor engine out characteristics and requiring a strut under the rear fuselage to prevent tipping during loading due to center-of-gravity problems.[2] Further problems was the use of magnesium near the engines which in case of engine fire could cause a uncontrolled fire, damaging the wing structure. (This was later revealed by a crash of an Ilyushin Il-12 near Voronez which killed all on board, following an engine fire. Subsequently, as a result of the accident investigation, the magnesium was replaced by aluminium alloys and the fire extinguishing system was redesigned.)[3] However, once these problems were resolved, factory test pilots praised the quality of the new aircraft, which contributed to the decision to launch the Il-12 in series production.
The fuselage of the Il-12 had a considerable volume, and was equipped with eight rectangular windows on each side. The crew consisted of three and the aircraft could transport 32 soldiers, 32 parachutists or cargo. There was also a civil version, which although designed to carry up to 32 passengers, was limited in Aeroflot service to 21, with normally only 18 carried.[2] At that passenger load, it meant that use of the Il-12 for passenger use was un-economic.
A total of 663 Il-12s were manufactured.[2] The aircraft was later improved into the Ilyushin Il-14.
Operational history
The Il-12 was revealed to the public on 1 May 1947, when a group of aircraft participated in the annual May Day flyby over Red Square in Moscow. Performance testing was completed by 20 May, and the first regular passenger service by the Il-12 on Aeroflot began in June 1947. The first regular international use of the Il-12 was on the Moscow-Sofia route in 1948. The Il-12 was used on Aeroflot's services to Paris from 1954.
Within the USSR, the Il-12 was placed on Aeroflot's longest route: Moscow-Khabarovsk, with the flight lasting 28 hours, including five refueling stops. From 1956, the Il-12 (modified for use on ice runways) supported the Soviet expeditions to Antarctica. Aeroflot continued to use the Il-12 on some routes until the end of 1970.
Export sales
The first export customer for the Il-12 was LOT Polish Airlines, who placed an order for five Il-12Bs after it was displayed at the Poznan Fair in Poland in the spring of 1948. This was followed by Czech Airlines, who purchased 10 aircraft from 1949–1951, TAROM in Romania from 1949, and at least 20 aircraft to CAAC in China.
Variants
- Il-12A : Basic passenger version with 27 seats standard, also produced in versions with 6, 11, 16, 18, 21 and 32 seats.
- Il-12B : Modification from 1948, fitted with an improved de-icing system, lengthened nosewheel and a small dorsal fin fillet.
- Il-12D : military transport version for the Soviet Air Force launched in 1948, for 38 paratroops or military cargo to 3700 kg.
- Il-12T : transport version for arctic operations, with a large cargo door on the left side of the fuselage.
Safety Record
Of the 663 Il-12s produced, 11 have been lost in accidents.
| Date | Registration | Location | Casualties | Details |
|---|---|---|---|---|
| 01.07.1947 |  Л1317
|
Vnukovo
|
NA | Engine failure, the aircraft lost speed and crashed. |
| 18.12.1947 | Л1343
|
near Krasnoyarsk
|
7/25 | Engine failure, crashed while returning to the aerodrome of departure. |
| 01.09.1948 | Л1465
|
Severny Airport
|
1/NA | Lost speed on take-off and was damaged due to crew errors |
| 09.09.1948 | Л1427
|
Buguruslan
|
5/5 | Loss of control due to engine failure simulation in a test flight. |
| 12.10.1948 | Л1450
|
near Baku
|
10/10 | Crashed in bad weather. |
| 23.12.1948 | Л1731
|
near Vnukovo
|
4/4 | mid-air collision due to crew negligence |
| 1952 |  SP-LHE
|
Warsaw
|
NA | Engine fire; written off. |
| 18.07.1952 | SP-LHC
|
Warsaw
|
0/NA | Damaged on landing |
| 05.10.1952 | Л1328
|
near Leningrad
|
5/5 | Mid-air collision due to gross negligence by air traffic controller[citation needed] |
| 27.07.1953 | .svg){kind=small} NA
|
 near Kanggye, DPRK
|
21/21 | Shot down by USAF F-86 Sabre and became the last aircraft destroyed during the Korean War.[4] |
| 28.10.1954 | Л1789
|
Krasnoyarsk Territory
|
20/20 | Collided into mountain |
| 04.03.1955 | Н479
|
Mezen
|
4/25 | Engine failure and fire resulting in emergency landing on a frozen lake. |
| 28.04.1956 | NA
|
 Berlin
|
3/6 | Collided with a church bell tower while landing in fog. |
| 23.11.1956 |  OK-DBP
|
 Eglisau
|
23/23 | Crashed in a field 12 km from Zurich. |
| 09.06.1958 | Л1364
|
near Magadan
|
20/20 | Collided with a hill while landing in bad weather. |
| 19.09.1958 | Л3904
|
145 km from Khabarovsk
|
28/28 | Crashed into mountain while trying to make an emergency landing at night in bad weather due low fuel; loss of orientation, violations of the ATC. |
| 01.1959 | 04249
|
Mirny Station, Antarctica | 0/NA | overran runway; landing gear failure |
Operators
Imported 42 IL-12 airliners from 1950 to 1951 used to airlift to Lhasa during the Incorporation of Tibet into the People's Republic of China. Some were refitted to aerial survey airplanes later. Retired in 1986.
Specifications (Il-12)
Data from The Osprey Encyclopedia of Russian Aircraft from 1875 - 1995[2]
General characteristics
Performance
- Endurance: 4.5 hr
- Climb to 5,000 m (16,400 ft): 15 minutes
References
- Notes
- ^ a b "Dates of Maiden Flights by Aircraft Designed by "Ilyushin" Design Bureau." Ilyushin Aviation Complex. Retrieved: 13 November 2010.
- ^ a b c d Gunston 1995, p. 110.
- ^ Gordon, Komissarov and Komissarov 2004, pp. 160–161.
- ^ "Up From Kitty Hawk 1947-1953." airforce-magazine.com. Retrieved: 17 July 2011.
- ^ Stroud 1968, p. 99.
- ^ Stroud 1968, p. 100.
- ^ Stroud 1968, p. 110.
- Bibliography
- Gordon, Yefim, Dmitry Komissarov and Sergei Komissarov. OKB Ilyushin: A History of the Design Bureau and its Aircraft. Hinckley, Leicestershire, UK: Midland Publishing, 2004. ISBN 1-85780-187-3.
- Gunston, Bill. The Osprey Encyclopedia of Russian Aircraft from 1875 - 1995. London: Osprey Aerospace, 1995. ISBN 1-85532-405-9.
- Stroud, John. Soviet Transport Aircraft since 1945. London: Putnam, 1968. ISBN 0-370-00126-5.