Product service experience

Product Service Experience Service experience (i.e., previous or current usage of the component) may be used to substantiate Development Assurance for previously developed hardware and for COTS components, where change is not introduced within this application. Note that in this context, this is direct product service history evidence, and not colloquial here say evidence. Data from non-airborne applications is not specifically excluded under RTCA/DO-254, although often these applications lack the necessary failure reporting data in order to be able to assess the product service experience. RTCA/DO-254 defines criteria on how to evaluate product service history. It should be noted that this is an onerous process, and many product service history cases do not have sufficient data in order to successfully evaluate product service history. Therefore, the architectural mitigation or advance verification methods must be used. 

Plastics are no different in this respect than other materials. If steel, aluminum, and ceramics were to be made into a different complex shapes and no prior history on their behavior for that processing shape existed, a period of trial and error would be required to ensure their meeting the required measurements. If relevant processing information or experience did exist, it would be possible for these metallic (or plastic) products to meet the requirements with the first product produced. Experience on new steel shapes always took trial and error time that included different shaped high pressure hydraulic steel cylinders that failed in service when used in a new injection molding hydraulically operating machine (author s experience). 

Three types of light sources for artificial weathering are in common use (1) enclosed UV carbon arc [7.5 UV energy output, approx. (x sunlight)], (2) open-flame sunshine carbon, and (3) water-cooled xenon arc. Selection of the light source involves many conditions and circumstances, such as the type of material being tested, product service conditions, previous testing experience, or the type of information desired. 

Tukker, A., 2004. Eight types of product-service system Eight ways to sustainability Experiences from SusProNet, Business Strategy and the Environment, 13 (4), 246-260. 

Materials With Limited Service. The desirability of specifying some degree of production impact testing, in addition to the weld procedure qualification tests, when using materials with limited low-temperature service experience below the minimum temperature stated in Table IX-2. 

For volume production of an aerosol fog of small particle size, on a large scale (suited to indoor use), the thermal aerosol fog generators appear to be very efficient. The Science Service experiments were mostly with this type. Two principal varieties have been developed. One discharges the insecticide solution or suspension as a relatively coarse spray into a jet of superheated steam delivered by a flash boiler of the tubular coil t3rpe. The other discharges that insecticide solution or suspension as a relatively coarse spray into a blast of hot gas emerging from a combustion chamber. The temperature is regulated by the controlled admixture of cold air. 

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Service Experience is data from previous operational use of the product concerned. Direct Evidence is concerned with analysis of data from Service Experience and what the results of that analysis showed in terms of satisfaction of the safety requirements. Backing Evidence is concerned with showing that the environment from which the data was obtained is sufficiently similar to that to which the re-used product will be subjected, that adequate performance-assessment and fault-recording processes were in place when the product was originally deployed, and that the analysis of the outputs of those processes was adequate and properly carried out. 

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