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and a higher income. However, the SAC3a is dependent on a much greater use of new materials for the wings and fuselage. This should reduce weight, potentially increasing the load and fuel efficiency but it does introduce some additional risks.

The design and prototype production phase
While the design concept is well advanced, further discussions are needed with the potential airline customers and airports to confirm the concept (estimated time = 3 months, costing £20 million). Once the design concept is agreed, the detailed design of the main elements of the aircraft can begin. The main elements include:
• specifying the engine with the chosen manufacturer; while the engine will be a standard model, various modifications will be needed to meet the requirements of the SAC3 (3 months and costing £20 million)
• the design of the avionics system and the production of a prototype will take approx. 18 months and cost £100 million;
• the design of the fuselage and the production of a prototype fuselage will take approx.15 months and cost £60 million for the SAC3b option (18 months; £80 million for the SAC3a);
• designing the wings and producing the prototype for use in the test aircraft will take 15 months and cost £80 million for the SAC3b (18 months; £120 million for the SAC3a)

The aircraft interior
The design of the interior of the aircraft (12 months; £20 million) can also begin once the design concept is agreed. However there is no great urgency: the interior fittings will only be included in the adapted prototype aircraft for the second set of flight trials. Although the aircraft interior may appear to be a relatively minor component, it is important for passenger comfort, safety and the efficient operation of the aircraft. It can be difficult to specify precisely since these factors are often hard to quantify and determining aspects such as “comfort” in advance.

Satisfying a variety of users
Any new aircraft has to meet the demands of several “users”. It has to be attractive to the passengers, meeting their expectations for comfort and safety. The aircraft also has to meet the demands of the airlines, providing efficiency and reliability, with the capacity and range necessary for the projected routes. The aircraft also has to be compatible with the facilities provided at the various airports: the aircraft must be able to land and take off safely; the refuelling systems must be suitable; passenger embarkation and baggage handling have to be considered in order to ensure a smooth integration of the new aircraft with the existing airport operations. Apparently minor issues, such as the size of baggage doors can cause significant and costly problems. While it may not cost much (£5 million), liaison with the key airports is essential and should start as soon as the design concept has been confirmed and allow 18 months. The results of this exercise provide input into the revision of the design and construction of the adapted prototype aircraft.

Avionics systems
Avionics systems in modern aircraft are crucial. But they are becoming ever more complex involving numerous separate computer based systems monitoring and controlling a great range of aircraft functions. In addition to the technical requirements, the systems also have to provide a clears man-machine interface. Providing the flight crew with data and con本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。