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Certification Procedures for Altered Interior Surfaces in Aircraft

This document outlines the Federal Aviation Administration's (FAA) certification procedures for altered interior surfaces of aircraft. The objective is to enhance standardization and consistency among Aircraft Certification Offices (ACOs) and Designated Engineering Representatives (DERs). It defines compliance requirements for altered interior panels, emphasizing that if a majority of surfaces are altered, they must meet current standards. The text explores qualification tests for altered surfaces when original spares are unavailable, detailing methods such as using in-service panels, substitute panels, and critical panels.

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Certification Procedures for Altered Interior Surfaces in Aircraft

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  1. Certification Procedures for Altered Interior Surfaces Tim Marker FAA Technical Center

  2. Certification Procedures for Altered Interior Surfaces FAA Objective: Improve consistency and standardization of practices by ACO’s and DER’s Any altered (re-painted, re-laminated, or otherwise resurfaced) interior panel must remain compliant with the original type certification basis of the aircraft If a majority of the interior panel surfaces will be altered, this constitutes a “substantially complete replacement”, and all surfaces must meet the current 65/65/200 requirements, regardless of original type certification basis Hardship encountered when original panel “spares” representing interior panel composition are not available

  3. How do we run a qualification test? Various alternatives exist by which altered panels can be qualified in the absence of exact panel spares: • Cut-out of in service panel • Substitute Panel, which is the same generic construction as the original, • including core type and thickness, type and number of pre-preg plies, and • any original surfacing such as paint or decorative • Critical Panel (Surrogate), which has burn length or heat release numbers • close to the limit (i.e., a burn length of 5 inches and a heat release rate of • 60/60)

  4. Cut-out of in service panel Advantages: Simple, Accurate, Quick Disadvantages: Destructive test requires replacement of entire panel, curvature of actual panel limits number of samples possible • Substitute Panel Advantages: Once produced, numerous tests can be run on abundant samples Disadvantages: Cost, Time, Accuracy • Critical Panel (Surrogate), Advantages: Once produced, numerous tests can be run on abundant samples, same panel can be used for qualification of variety of in-service alterations Disadvantages: Cost, Time, Accuracy (effects of synergism can not be accurately predicted)

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