Tu-154 "Careless" @·AIRCRAFTUBE

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Tupolev Tu-154

The Tupolev Tu-154 (Russian: Ту-154; NATO reporting name: Careless) is a three-engine medium-range narrow-body airliner designed in the mid-1960s and manufactured by Tupolev. A workhorse of Soviet and (subsequently) Russian airlines for several decades, it carried half of all passengers flown by Aeroflot and its subsidiaries (137.5 million/year or 243.8 billion passenger km in 1990), remaining the standard domestic-route airliner of Russia and former Soviet states until the mid-2000s. It was exported to 17 non-Russian airlines and used as head-of-state transport by the air forces of several countries.

With a cruising speed of 975 kilometres per hour (606 mph), the Tu-154 is one of the fastest civilian aircraft in use and has a range of 5,280 kilometres (3,280 mi). Capable of operating from unpaved and gravel airfields with only basic facilities, it was widely used in the extreme Arctic conditions of Russia's northern/eastern regions where other airliners were unable to operate. Originally designed for a 45,000 hr service life (18,000 cycles) but capable of 80,000 hrs with upgrades, it is expected to continue in service until 2016, although noise regulations have restricted flights to western Europe and other regions. In January 2010, Russian flag carrier Aeroflot announced the retirement of its Tu-154 fleet after 40 years, with the last scheduled flight being Aeroflot Flight 736 from Ekaterinburg to Moscow on 31 December 2009.

Since 1968 there have been 39 fatal incidents involving the Tu-154, most of which were caused either by factors unrelated to the aircraft, or by its extensive use in demanding conditions.

Development

The Tu-154 was developed to meet Aeroflot's requirement to replace the jet-powered Tu-104, the Antonov An-10 'Ukraine' and the Ilyushin Il-18 turboprops. The requirements called for either a payload capacity of 16–18 tonnes (35,000–40,000 lb) with a range of 2,850–4,000 kilometres (1,770–2,490 mi) while cruising at 900 km/h (560 mph), or a payload of 5.8 tonnes (13,000 lb) with a range of 5,800–7,000 kilometres (3,600–4,300 mi) while cruising at 850 km/h (530 mph). A take-off distance of 2,600 metres (8,500 ft) at maximum take-off weight was also stipulated as a requirement. Conceptually similar to the British Hawker Siddeley Trident, which first flew in 1962, and the American Boeing 727, which first flew in 1963, the medium-range Tu-154 was marketed by Tupolev at the same time as Ilyushin was marketing the long-range Ilyushin Il-62. The Soviet Ministry of Aircraft Industry chose the Tu-154 as it incorporated the latest in Soviet aircraft design and best met Aeroflot's anticipated requirements for the 1970s and 1980s.

The first project chief was Sergey Yeger; in 1964, Dmitryi S. Markov assumed that position. In 1975, the project lead role was turned over to Aleksandr S. Shengardt.

The Tu-154 first flew on 4 October 1968. The first deliveries to Aeroflot were in 1970 with freight (mail) services beginning in May 1971 and passenger services in February 1972. There was still limited production of the 154M model as of January 2009, despite previous announcements of the end of production in 2006. The last serial Tu-154 was delivered to the Russian Defense Ministry on 19 February 2013. 1025 Tu-154s have been built, 214 of which are still in service as of 14 December 2009. In January 2013 the Aviakor factory announced that it was about to deliver a new Tu-154M to the Russian Ministry of Defense equipped with upgraded avionics, a VIP interior and a communications suite. The factory has 4 unfinished hulls in its inventory which can be completed if new orders are received.

Design

The Tu-154 is powered by three rear-mounted low-bypass turbofan engines arranged similarly to those of the Boeing 727, but it is slightly larger than its American counterpart. Both the 727 and the Tu-154 use an S-duct for the middle (Number 2) engine. The original model was equipped with Kuznetsov NK-8-2 engines, which were replaced with Soloviev D-30KU-154 in the Tu-154M. All Tu-154 aircraft models have a relatively high thrust-to-weight-ratio which gave excellent performance, at the expense of poorer fuel efficiency. This became an important factor in later decades as fuel costs grew.

The flight deck is fitted with conventional dual yoke control columns. Flight control surfaces are hydraulically operated.

The cabin of the Tu-154, although of the same six-abreast seating layout, gives the impression of an oval interior, with a lower ceiling than is common on Boeing and Airbus airliners. The passenger cabin accommodates 128 passengers in a two-class layout and 164 passengers in single-class layout, and up to 180 passengers in high-density layout. The layout can be modified to what is called a winter version where some seats are taken out and a wardrobe is installed for passenger coats. The passenger doors are smaller than on its Boeing and Airbus counterparts. Luggage space in the overhead compartments is very limited.

Like the Tupolev Tu-134, the Tu-154 has a wing swept back at 35° at the quarter-chord line. The British Hawker Siddeley Trident has the same sweepback angle, while the Boeing 727 has a slightly smaller sweepback angle of 32°. The wing also has anhedral (downward sweep) which is a distinguishing feature of Russian low-wing airliners designed during this era. Most Western low-wing airliners such as the contemporary Boeing 727 have dihedral (upward sweep). The anhedral means that Russian airliners have poor lateral stability compared to their Western counterparts, but also have weaker dutch roll tendencies.

Considerably heavier than its predecessor Soviet-built airliner the Ilyushin Il-18, the Tu-154 was equipped with an oversized landing gear to reduce ground load, enabling it to operate from the same runways. The aircraft has two six-wheel main bogies fitted with large low-pressure tires that retract into pods extending from the trailing edges of the wings (a common Tupolev feature), plus a two-wheel nose gear unit. Soft oleo struts (shock absorbers) provide a much smoother ride on bumpy airfields than most airliners, which only very rarely operate on such poor surfaces.

The original requirement was to have a three-person flight crew – captain, first officer and flight engineer – as opposed to 4/5-person crew on other Soviet airliners. It became evident that a fourth crew member, a navigator, was still needed, and a seat was added on production aircraft, although his workstation was compromised due to the limitations of the original design. Navigators are no longer trained and this profession will become obsolete with the retirement of older Soviet-era planes.

The latest variant (Tu-154M-100, introduced 1998) includes an NVU-B3 Doppler navigation system, a triple autopilot, which provides an automatic ILS approach according to ICAO category II weather minima, an autothrottle, a Doppler drift and speed measure system (DISS), "Kurs-MP" radio navigation suite and others. A stability and control augmentation system improves handling characteristics during manual flight. Modern upgrades normally include a TCAS, GPS and other modern systems, mostly American or EU-made.

Early versions of the Tu-154 cannot be modified to meet the current Stage III noise regulations and are banned from flying where those regulations are in force, such as Europe.

Variants

Many variants of this airliner have been built. Like its western counterpart, the 727, many of the Tu-154s in service have been hush-kitted, and some converted to freighters.

  • Tu-154 : Tu-154 production started in 1970, while first passenger flight was performed at 9 February 1972. Powered by Kuznetsov NK-8-2 turbofans, it carried 164 passengers. About 42 were built.
  • Tu-154A : The first upgraded version of the original Tu-154, the A model, in production since 1974, added center-section fuel tanks and more emergency exits, while engines were upgraded to higher-thrust Kuznetsov NK-8-2U. Other upgrades include automatic flaps/slats and stabilizer controls and modified avionics. Max. take-off weight – 94,000 kg (207,235 lb). There were 15 different interior layouts for the different domestic and international customers of the airplane, seating between 144 and 152 passengers. The easiest way to tell the A model from the base model is by looking at the spike at the junction of the fin and tail; this is a fat bullet on the A model rather than a slender spike on the base model.
  • Tu-154B : As the original Tu-154 and Tu-154A suffered wing cracks after a few years in service, a version with a new, stronger wing, designated Tu-154B, went into production in 1975. It also had an extra fuel tank in fuselage, extra emergency exits in the tail, and the maximum take-off weight increased to 98,000 kg (216,053 lb). Also important to Aeroflot was that the increased passenger capacity led to lower operating costs. As long as the airplane had the NK-8-2U engines the only way to improve the economics of the airplane was to spread costs across more seats. The autopilot was certified for ICAO Category II automatic approaches. Most previously built Tu-154 and Tu-154A were also modified into this variant, with the replacement of the wing. Max. take-off weight increased to 96,000 kg (211,644 lb). 111 were built.
  • Tu-154B-1 : Aeroflot wanted this version for increased revenue on domestic routes. It carried 160 passengers. This version also had some minor modifications to fuel system, avionics, air conditioning, landing gear. 64 were built from 1977 to 1978.
  • Tu-154B-2 : A minor modernization of Tu-154B-1. The airplane was designed to be converted from the 160 passenger version to a 180 passenger version by removing the galley. The procedure took about two and a half hours. Some of the earlier Tu-154B modified to that standard. Max. take-off weight increased to 98,000 kg (216,053 lb), later to 100,000 kg (220,462 lb). 311 aircraft were built, including VIP versions, a few of them are still in use.
  • Tu-154S : The Tu-154S is an all-cargo or freighter version of the Tu-154B, using a strengthened floor, and adding a forward cargo door on the port side of the fuselage. The airplane could carry 9 Soviet PAV-3 pallets. Max. payload – 20,000 kg (44,092 lb). There were plans for 20 aircraft, but only nine aircraft were converted; two from Tu-154 model and seven from Tu-154B model. Trials were held in the early 1980s and the aircraft was authorized regular operations in 1984. By 1997 all had been retired.
  • Tu-154M : The Tu-154M and Tu-154M Lux are the most highly upgraded versions, which first flew in 1982 and entered mass production in 1984. It uses more fuel-efficient Soloviev D-30KU-154 turbofans. Together with significant aerodynamic refinement, this led to much lower fuel consumption and therefore longer range, as well as lower operating costs. The aircraft has new double-slotted (instead of triple-slotted) flaps, with an extra 36-degree position (in addition to existing 15, 28 and 45-degree positions on older versions), which allows reduction of noise on approach. It also has a relocated auxiliary power unit and numerous other improvements. Maximum takeoff weight increased first to 100,000 kg (220,462 lb), then to 102,000 kg (224,872 lb). Some aircraft are certified to 104,000 kg (229,281 lb). About 320 were manufactured. Mass production ended in 2006, though limited manufacturing continued as of January 2009.(photo link)
  • No new airframes have been built since the early 1990s, and production since then involved assembling aircraft from components on hand. Chinese Tu-154MD electronic intelligence aircraft carries a large-size synthetic aperture radar (SAR) under its mainframe.
  • Tu-154M-LK-1 : Cosmonaut Trainer. This was a Salon VIP aircraft modified to train cosmonauts to fly the Buran reusable spacecraft, the Soviet equivalent of the US Space Shuttle. The Tu-154 was used because the Buran required a steep descent, and the Tu-154 was capable of replicating that. The cabin featured trainee workstations, one of which was the same as the Buran's flightdeck. The forward baggage compartment was converted into a camera bay, because the aircraft was also used to train cosmonauts in observation and photographic techniques.
  • Tu-154M-ON Monitoring Aircraft : Germany modified one of the Tu-154s it had on hand from the former East German Air Force into an observation airplane. This airplane was involved with the Open Skies inspection flights. It was converted at the Elbe Aircraft Plant (Elbe Flugzeugwerke) in Dresden, and flew in 1996. After two dozen monitoring missions, it was lost in a mid-air collision in 1997. : The Russians also converted a Tu-154M to serve as an Open Skies Monitoring aircraft. They used the Tu-154M-LK-1, and converted it to a Tu-154M-ON. When the aircraft is not flying over North America, it is used to ferry cosmonauts around. China is also believed to have converted one Tu-154 to an electronic countermeasures aircraft.
  • Tu-154M-100 : Design of this variant started in 1994, but the first aircraft were not delivered until 1998. It is an upgraded version with Western avionics, including the Flight Management Computer, GPS, EGPWS, TCAS, and other modern systems. The airplane could carry up to 157 passengers. The cabin featured an automatic oxygen system and larger overhead bins. Only three were produced, as payment of debts owed by Russia to Slovakia. Three aircraft were delivered in 1998 to Slovak Airlines, and sold back to Russia in 2003.
  • Tu-155 : A Tu-154 converted into a testbed for alternative fuels; it first flew in 1988 and was used until the fall of the Soviet Union, after which it was put in storage.
  • Tu-164 : Initial designation of the Tu-154M.
  • Tu-174 : Proposed stretched version of Tu-154.
  • Tu-194 : Proposed shortened version of Tu-154.

Civil operators

As of 26 March 2012 104 Tupolev Tu-154 aircraft (all variants) remained in airline service. As of 20 February 2011 in Iran, all the remaining numbers of this aircraft were grounded after two recent incidents.

Incidents and accidents

As of January 2011, since 1970 there have been 110 serious incidents involving the Tu-154, and 69 hull losses, 30 of which did not involve fatalities. Of the fatal incidents, five resulted from terrorist or military action (two other war-time losses were non fatal), several from poor runway conditions in winter (including one in which the airplane struck snow plows on the runway), cargo overloading in the lapse of post-Soviet federal safety standards, and mid-air collisions due to faulty air traffic control. Other incidents resulted from mechanical problems (two cases prior to 2001), running out of fuel on unscheduled routes, pilot errors (including inadequate flight training for new crews), and cargo fires; several accidents remain unexplained. The Tu-154 is described as having an average (or better than expected) safety record considering its length of service and heavy use in demanding conditions where other airliners are unable to operate. On January 2, 2011, Russia's Federal Transport Oversight Agency advised airlines to stop using remaining examples of the Tu-154 (B variant) until the fatal fire incident in Surgut had been investigated. Its operation in Iran ceased in February 2011 due to a number of crashes and incidents involving the type (almost 9% of all Tu-154 losses have occurred in Iran). This grounding compounded the effects of US embargo on civil aircraft parts, substantially decreasing the number of airworthy aircraft in the Iranian civil fleet. In 2010 there were two fatal losses of the Tu-154 due to pilot error and/or weather conditions (a Polish presidential jet attempting a rural airfield landing in heavy fog, and a Russian-registered plane that suffered engine stall after a crew member accidentally de-activated a fuel transfer pump). Following these accidents, in March 2011 the Russian Federal Bureau of Aviation recommended a withdrawal of remaining Tu-154Ms from service. In December 2010, Uzbekistan Airways also declared that it would cease to operate Tu-154s from 2011.

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Tupolev Tu-154 of Wikipedia ( authors )

Specifications

  Tu-154B-2 Tu-154M
Cockpit crew Three/Four
Seating capacity 114–180
Length 48.0 metres (157 ft 6 in)
Wingspan 37.55 metres (123 ft 2 in)
Wing area 201.5 square metres (2,169 sq ft)
Height 11.4 metres (37 ft 5 in)
Max take-off weight 98,000 kilograms (216,000 lb) – 100,000 kilograms (220,000 lb) 102,000 kilograms (225,000 lb) – 104,000 kilograms (229,000 lb)
Empty weight 50,700 kilograms (111,800 lb) 55,300 kilograms (121,900 lb)
Maximum speed 950 km/h (510 kn)
Range fully loaded 2,500 km (1,300 nmi; 1,600 mi) 5,280 km (2,850 nmi; 3,280 mi)
Range with max fuel 3,900 km (2,100 nmi; 2,400 mi) 6,600 km (3,600 nmi; 4,100 mi)
Service ceiling 12,100 metres (39,700 ft)
Engine (x 3) Kuznetsov NK-8-2U Soloviev D-30KU-154
Max. thrust (x 3) 90 kN (20,000 lbf) each 103 kN (23,148 lbf) each
Max. fuel capacity 47,000 litres (10,000 imp gal; 12,000 US gal) 49,700 litres (10,900 imp gal; 13,100 US gal)

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This text is available under the Creative Commons Attribution-ShareAlike License
Source : Article Tupolev Tu-154 of Wikipedia ( authors )
Tupolev Tu-154 "Careless" : Your comments on this subject
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