Tupolev Tu-154 | design

Design

Tupolev Tu-154

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 give excellent performance, at the expense of lower fuel efficiency. This became an important factor in later decades as fuel costs grew.[ citation needed]

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 nosegear unit. Soft oleo struts ( shock absorbers) provide a much smoother ride on bumpy airfields than most airliners, which very rarely operate on such poor surfaces.

The original requirement was to have a three-person flight crewcaptain, first officer and flight engineer – as opposed to a four- or five-person crew, as 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 their workstation was compromised due to the limitations of the original design. Navigators are no longer trained and this profession is becoming 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), and a "Kurs-MP" radio navigation suite.[ citation needed] 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 the European Union.

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