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most transport category airplanes do not have duplicated nosewheel assemblies; and some do not have duplicated wheels on each main undercarriage. A transport category helicopter is permitted to have only one main rotor head, and may have only one engine. If a transport category helicopter has only one engine it is only eligible to be a Class B (or
Performance Group 2) helicopter. An example of a transport category helicopter with only one engine is the
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duplicated elements wherever failure of one element is likely to cause an accident. For example, transport category airplanes must have at least two engines and be flown by at least two pilots. The loads on the wings and tailplanes are usually carried by multiple load paths. If one element of the primary structure fails due to
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principle is not required in airplanes and helicopters that are not certificated in the transport category. If an element in a transport category airplane or helicopter is not highly critical, or if its failure is relatively benign, it is possible for that element not to be duplicated. For example,
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A principle behind transport category design standards is that any element in an airplane or helicopter can fail, but the risk of such a failure causing an accident should be acceptable under certain airworthiness requirements. Consequently, transport category airplanes and helicopters have
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is a category of airworthiness applicable to large civil airplanes and large civil helicopters. Any aircraft's airworthiness category is shown on its airworthiness certificate. The name "transport category" is used in the US, Canada, Europe and many other countries.
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Design requirements for the transport category do not specify upper or lower limits on the maximum takeoff weight or number of passenger seats but examples of these helicopters typically have maximum takeoff weights greater than 7,000 lb (3 175 kg).
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the remaining sound elements of the structure must carry the loads until the failed structural element is discovered in scheduled maintenance.
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has similar certification requirements, also titled Parts 25 and 29, for application to transport category airplanes and helicopters.
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Modern propeller-driven airplanes with more than 19 passenger seats or a MTOW greater than 19,000 lb (8618 kg); or
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Jets with 10 or more passenger seats or maximum takeoff weights greater than 12,500 lb (5700 kg); or
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Design requirements for the transport category do not specify upper or lower limits on the
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Older propeller-driven airplanes with MTOW greater than 12,500 lb (e.g.
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of transport category airplanes and helicopters respectively. In Europe the
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Easily recognisable examples of transport category helicopters are
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