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Certification Procedures for Altered Interior Surfaces

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Certification Procedures for Altered Interior Surfaces. Tim Marker. FAA Technical Center. Certification Procedures for Altered Interior Surfaces. FAA Objective: Improve consistency and standardization of practices by ACO’s and DER’s.

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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

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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)
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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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