Aircraft upholstery leather guide
“Aviation-grade leather” means leather that has been flame-retardant treated and tested to the FAR 25.853(a) 12-second vertical burn test, and that ships with a material-test record tying those results to the hide you received. It is not an FAA approval category — there is no such thing as FAA-approved leather — it is a description of how the hide was finished and what documentation comes with it.
Three things separate it from ordinary upholstery leather: an FR topcoat or impregnation applied during finishing, burn-test results recorded against a specific production run and dye lot, and paperwork that connects that record to the shipment. Ordinary automotive or furniture leather has none of these, and no amount of quality makes up for the missing record.
What the burn test actually measures
Leather used as a seat covering is evaluated under 14 CFR Part 25 Appendix F Part I, the 12-second vertical Bunsen burner test.
| Criterion | Limit |
|---|---|
| Average burn length | 8 inches or less |
| Average flame time after flame removal | 15 seconds or less |
| Flame time of drippings | 5 seconds or less |
Leather does not melt or drip the way a thermoplastic does — it chars. That is part of why it performs well here. But untreated leather will still carry a flame past the burn length limit, which is why the FR finish matters.
Test evidence and installation approval are different things
This is the distinction that causes the most trouble. A report showing how a leather performed in a particular test is evidence about the material. It does not, by itself, approve the completed seat or interior.
Aircraft category, certification basis, the cushion and fire blocker underneath, adhesives, thread, seam construction, and the alteration method can all affect what the approving authority requires. The material record is one input to that determination. It is not the determination.
What to ask before buying aircraft upholstery leather
- What was tested? The leather construction and test configuration, not a marketing name.
- Which test is recorded? Ask for the cited standard and procedure. FAR 25.853(a) 12-second vertical is the one that applies to seat coverings. A protective-clothing or furniture standard is not a substitute.
- How is the shipment identified? A useful document connects the record to the color and dye lot actually supplied.
- Who accepts it? Confirm the required evidence with the A&P, IA, repair station, engineer, or other responsible approval authority before cutting.
- What about everything else? Thread, foam, fire blocker, and adhesive are separate items with separate documentation. The leather record covers the leather.
Slipstream material documentation
Slipstream Aviation Leather is sold by the full hide only, approximately 50–55 square feet. Each hide ships with Carolyn Fabrics-branded manufacturer production-order material-test documentation matched to the supplied color and dye lot, recording the leather material's FAR 25.853 12-second vertical test results.
That wording is deliberate. The record covers the leather material described in the document. It is not FAA approval of the aircraft, the seat, or the finished installation, and we will not describe it that way.
The practical characteristics still matter
Once the approval path is settled, compare the things that determine how the cabin wears: hide size and yield, thickness, finish, how it flexes over compound curves, light exposure and colorfastness, cleaning method, and color consistency across hides.
Because leather is a natural material and we sell it by the full hide, check color and hand before committing — the Slipstream sample deck is the selection tool. And plan quantity properly: the trade conversion is roughly 18 square feet of hide per yard of 54-inch fabric, which already carries a waste factor for hide shape and natural markings.
Frequently asked questions
What makes leather aviation grade?
Flame-retardant treatment applied during finishing, testing to the FAR 25.853(a) 12-second vertical burn criteria, and material-test documentation tied to the specific production run and dye lot supplied. It describes finish and documentation, not an FAA approval class.
Is there such a thing as FAA-approved leather?
No. The FAA approves aircraft, alterations, and installations — not rolls or hides of material. A supplier can document how a material performed in a specified test. Only the responsible approval authority determines whether the finished installation is acceptable.
Can I use regular automotive or furniture leather in an aircraft?
On a certificated aircraft, not unless your approval basis and test evidence support it. Ordinary leather carries no aviation flammability documentation. On an experimental aircraft the certification rules generally do not apply, but the burn behavior is the same.
What test applies to aircraft seat leather?
The 12-second vertical Bunsen burner test in 14 CFR Part 25 Appendix F Part I: average burn length 8 inches or less, average flame time after removal 15 seconds or less, and drippings that flame no longer than 5 seconds.
Does the leather certificate cover the foam and thread?
No. It covers the leather, in the configuration tested. Cushion foam, fire blocker, thread, and adhesive each require their own documentation.
How much leather does an aircraft interior take?
A four-place cabin commonly plans out at about five hides of 50–55 square feet, allowing for cutting around natural markings. See the aircraft material quantity guide for the full planning table.