ISO/TR 224:1998 PDF

This Technical Report specifies the standard form to be used for a declaration of design and performance (DDP) for aircraft equipment.

A DDP is the commitment of a manufacturer to deliver a product complying with the defined dimensions and performances, based on qualification tests carried out by the NSO (National Surveillance Organization), a major user or by the manufacturer himself.

A DDP is not a compulsory procedure, it remains optional; its purpose is to avoid repeated qualification tests for each use.

For a specific program, the DDP can be certified for the aircraft manufacturer or the NSO. This means that the commitments of the manufacturer were met when the aircraft was certified.

The DDP is intended for components and equipment which do not relate to any national or international or aircraft manufacturer specification.

If a normative document giving a full definition of a product exists, the dimensions, performances and qualification of the product in question must be in accordance with that document.