COME ON, YOU ARE SAFE !! Composites materials are formed by combining materials together to form an overall structure that is better than the sum of the individual components. Also, every airliner has to be certified to have the right to fly. A Certificate of Airworthiness (CofA), or an airworthiness certificate, is issued for an aircraft by the national aviation authority in the state in which the aircraft is registered. The airworthiness certificate attests that the aircraft is airworthy insofar as the aircraft conforms to its type design. Each airworthiness certificate is issued in one of a number of different categories. A certificate of airworthiness is issued when the aircraft is registered in the name of the owner. Thereafter, a yearly currency fee is payable to renew the Certificate of Airworthiness. If this fee is not paid when due, the certificate expires and the owner must apply again for this certificate to be issued. The Certificate of Airworthiness can only issued when a certificate of release to service from the maintenance facility declares that the maintenance due has been carried out and the aircraft is then certified as being airworthy. In the USA, Australia and some other countries, each airworthiness certificate is classified as either a Standard Airworthiness Certificate or a Special Airworthiness Certificate. Aircrafts are extremly solid: Composite materials (also called composition materials or shortened to composites) are materials made from two or more constituent materials with significantly different physical or chemical properties, that when combined, produce a material with characteristics different from the individual components. The individual components remain separate and distinct within the finished structure. The new material may be preferred for many reasons: common examples include materials which are stronger, lighter or less expensive when compared to traditional materials. Typical engineered composite materials include: Composite building materials such as cements, concrete Reinforced plastics such as fiber-reinforced polymer Metal Composites Ceramic Composites (composite ceramic and metal matrices) The most advanced examples perform routinely on spacecraft in demanding environments.
Posted on: Fri, 27 Jun 2014 01:25:31 +0000