Skip to content
LexBuild

Advisory Circular 25.856-1, Thermal/Acoustic Insulation Flame Propagation Test Method Details 

---
identifier: "/us/fr/05-14252"
source: "fr"
legal_status: "authoritative_unofficial"
title: "Advisory Circular 25.856-1, Thermal/Acoustic Insulation Flame Propagation Test Method Details"
title_number: 0
title_name: "Federal Register"
section_number: "05-14252"
section_name: "Advisory Circular 25.856-1, Thermal/Acoustic Insulation Flame Propagation Test Method Details"
positive_law: false
currency: "2005-07-20"
last_updated: "2005-07-20"
format_version: "1.1.0"
generator: "[email protected]"
agency: "Transportation Department"
document_number: "05-14252"
document_type: "notice"
publication_date: "2005-07-20"
agencies:
  - "Transportation Department"
  - "Federal Aviation Administration"
fr_citation: "70 FR 41810"
fr_volume: 70
fr_action: "Notice of availability of Advisory Circular (AC) 25.856-1."
---

#  Advisory Circular 25.856-1, Thermal/Acoustic Insulation Flame Propagation Test Method Details

**AGENCY:**

Federal Aviation Administration (FAA), DOT.

**ACTION:**

Notice of availability of Advisory Circular (AC) 25.856-1.

**SUMMARY:**

This AC provides methods acceptable to the Administrator for showing compliance with the revised airworthiness standards concerning new fire protection requirements applicable to thermal/acoustic insulation materials. The guidance in this AC describes a test method to determine the flammability and flame propagation characteristics of thermal/acoustic insulation materials on transport category airplanes.

*How to Obtain Copies:* A paper copy of AC 25.856-1 may be obtained by writing to the U.S.Department of Transportation, Subsequent Distribution Office, DOT Warehouse, SVC-121.23, Ardmore East Business Center, 3341Q 75th Ave., Landover, MD 20785, telephone (301) 322-5377, or faxing your request to the warehouse at (301) 386-5394. The AC also will be available on the Internet at *http://www.airweb.faa.gov/rgl* .

Ali Bahrami,

Manager, Transport Airplane Directorate, Aircraft Certification Service.