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

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Certification procedures for altered interior surfaces 1208701

Certification Procedures for Altered Interior Surfaces

Tim Marker

FAA Technical Center


Certification procedures for altered interior surfaces 1208701

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


Certification procedures for altered interior surfaces 1208701

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)


Certification procedures for altered interior surfaces 1208701

  • 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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