[Federal Register Volume 69, Number 239 (Tuesday, December 14, 2004)]
[Notices]
[Page 74563]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 04-27359]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration


Proposed Advisory Circulars 25.856-1X, Thermal/Acoustic 
Insulation Flame Propagation Test Method Details; and 25.856-2X, 
Installation of Thermal/Acoustic Insulation for Burnthrough Protection

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Notice of proposed advisory circulars and request for comments.

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SUMMARY: The Federal Aviation Administration invites public comment on 
two draft advisory circulars concerning thermal.acoustic insulation 
installed on transport category airplanes. The draft advisory material 
provides for demonstrating compliance with amendment 25-111, which was 
adopted on July 31, 2003.

DATE: Comments must be received on or before January 28, 2005.

ADDRESSES: You should send your comments to the Federal Aviation 
Administration, Transport Airplane Directorate, Attention: Jeff 
Gardlin, Airframe/Cabin Safety Branch, ANM-115, Transport Airplane 
Directorate, Aircraft Certification Service, 1601 Lind Avenue SW., 
Renton, Washington 98055-4056. You may also fax your comments to (425) 
227-1149, or you may send them electronically to: [email protected]. 
You may review all comments received at the above address between 7:30 
a.m. and 4 p.m. weekdays, except Federal holidays.

FOR FURTHER INFORMATION CONTACT: Jeff Gardlin at the above address, 
telephone (425) 227-2136.

SUPPLEMENTARY INFORMATION:

How Do I Obtain a Copy of the Proposed Advisory Circular?

    An electronic copy of the draft advisory circulars is available at 
the following Internet address: http://www.airweb.faa.gov/rgl. If you 
do not have access to the Internet, you may request a copy by 
contacting Jeff Gardlin at the address or phone number listed above.

How Do I Submit Comments on the Proposed Advisory Circular

    You are invited to comment on the draft ACs by submitting written 
comments, data, or views. Please identify the ACs by title and number. 
You should submit your comments to the address specified above. We will 
consider all comments that we receive on or before the closing date for 
comments before issuing the final AC.

Discussion

    On July 31, 2003, we published amendment 25-111 to 14 CFR part 25 
(68 FR 45046). That amendment added new fire protection requirements 
applicable to thermal/acoustic insulation materials. It introduced a 
new test method and requirement that improves the fire penetration 
resistance of those materials, and added new test requirements related 
to flame propagation and burnthrough penetration resistance.
    We have developed two draft advisory circulars to assist in 
demonstrating compliance with amendment 25-111. These ACs are:
     AC 25.756-1X, ``Thermal/Acoustic Insulation Flame 
Propagation Test Method Details.'' This AC describes the test method to 
determine the flammability and flame propagation characteristics of 
thermal/acoustic insulation materials. It addresses issues such as test 
sample construction, test conduct considerations, and the applicability 
of amendment 25-111 to certain materials and installations.
     AC 25.856-2X, ``Installation of Thermal/Acoustic 
Insulation for Burnthrough Protection.'' This AC provides guidance 
concerning the test method to determine the burnthrough resistance of 
thermal/acoustic insulation materials installed in transport category 
airplanes. Also included is guidance on the installation details and 
techniques, as well as test condition details.

    Issued in Renton, Washington, on December 3, 2004.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 04-27359 Filed 12-13-04; 8:45 am]
BILLING CODE 4910-13-M