AMC 25.605(a) Fabrication
methods — Approved process specifications
ED
Decision 2021/015/R
Examples
of fabrication method processes that may require close control to consistently
produce safe parts include the following:
—
castings,
—
composite
resin transfer methods,
—
bonding,
—
welding,
—
heat-treating,
or
—
additive
manufacturing methods.
Fabrication
method process specifications should include all critical inspection steps
and/or process controlled steps, and should be substantiated (they may require
re-evaluation and new
substantiation, if modified later). All the inherent part characteristics that
result from the fabrication method and affect the material strength and other
properties should be closely correlated with non‑destructive inspection (NDI) and/or process
control variables. Furthermore, the applicant should show that the equipment
used to support the process-critical manufacturing steps (particularly those
steps that are not directly supported and controlled through inspection) is
under appropriate process control, to ensure the consistent production of safe
parts.
Note 1:
‘safe parts’ must comply with CS 25.603 and CS 25.605 to ensure safety by maintaining the
appropriate ‘material strength and other properties’ that are assumed in the
design data. Therefore, applicants are reminded that, beyond the consideration
of airframe strength, these CSs are also applicable to other applications for
which safety relies on strength or stiffness, e.g. system structures.
Furthermore, the reference to ‘other properties’ is intended to ensure that
safety is also maintained for applications for which safety relies on ‘other
properties’ (for example, safe interior cabin parts that rely upon suitable
flammability properties).
Note 2:
approved fabrication process specifications and approved material
specifications can be, for example, industry or military specifications, or
European Technical Standard Orders (ETSOs).
[Amdt
No: 25/27]
Aircraft fabrication methods like welding, bonding, casting, composites, heat treating, and additive manufacturing require approved process specifications. These specifications must include critical inspections, process controls, and equipment monitoring to ensure consistent production of safe parts with appropriate material strength and properties, validated through non-destructive inspection.
* Summary by Aviation.Bot - Always consult the original document for the most accurate information.
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