[Federal Register Volume 75, Number 1 (Monday, January 4, 2010)]
[Rules and Regulations]
[Pages 37-39]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: E9-31118]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 25

[Docket No. NM424; Special Conditions No. 25-400-SC]


Special Conditions: Airbus Model A330 Series Airplanes; Seats 
with Non-Traditional, Large, Non-Metallic Panels

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Final special conditions; request for comments.

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SUMMARY: These special conditions are issued for the Airbus Model A330 
series airplanes. These airplanes will have a novel or unusual design 
feature(s) associated with seats that include non-traditional, large, 
non-metallic panels that would affect survivability during a post-crash 
fire event. The applicable airworthiness regulations do not contain 
adequate or appropriate safety standards for this design feature. These 
special conditions contain the additional safety standards that the 
Administrator considers necessary to establish a level of safety 
equivalent to that established by the existing airworthiness standards.

DATES: The effective date of these special conditions is December 28, 
2009. We must receive your comments by February 18, 2010.

ADDRESSES: You must mail two copies of your comments to: Federal 
Aviation Administration, Transport Airplane Directorate, Attn: Rules 
Docket (ANM-113), Docket No. NM424, 1601 Lind Avenue, SW., Renton, 
Washington 98057-3356. You may deliver two copies to the Transport 
Airplane Directorate at the above address. You must mark your comments: 
Docket No. NM424. You can inspect comments in the Rules Docket 
weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.

FOR FURTHER INFORMATION CONTACT: Alan Sinclair, FAA, Airframe/Cabin 
Safety Branch, ANM-115, Transport Airplane Directorate, Aircraft 
Certification Service, 1601 Lind Avenue, SW., Renton, Washington 98057-
3356; telephone (425) 227-2785; facsimile (425) 227-2195; e-mail 
[email protected].

SUPPLEMENTARY INFORMATION: The FAA has determined that notice of, and 
opportunity for, prior public comment on these special conditions are 
impracticable because these procedures would significantly delay 
issuance of the design approval and thus delivery of the affected 
aircraft. In addition, the substance of these special conditions has 
been subject to the public-comment process in several prior instances 
with no substantive comments received. The FAA therefore finds that 
good cause exists for making these special conditions effective upon 
issuance.

Comments Invited

    We invite interested people to take part in this rulemaking by 
sending written comments, data, or views. The most helpful comments 
reference a specific portion of the special conditions, explain the 
reason for any recommended change, and include supporting data. We ask 
that you send us two copies of written comments.
    We will file in the docket all comments we receive, as well as a 
report summarizing each substantive public contact with FAA personnel 
about these special conditions. You can inspect the docket before and 
after the comment closing date. If you wish to review the docket in 
person, go to the address in the ADDRESSES section of this preamble 
between 7:30 a.m. and 4 p.m., Monday through Friday, except Federal 
holidays.
    We will consider all comments we receive by the closing date for 
comments. We will consider comments filed late if it is possible to do 
so without incurring expense or delay. We may change these special 
conditions based on the comments we receive.
    If you want us to let you know we received your comments on these 
special conditions, send us a self-addressed, stamped postcard on which 
the docket number appears. We will stamp the date on the postcard and 
mail it back to you.

Background

    On September 15, 2009, Airbus Industrie, 1 Rond Point Maurice 
Bellonte, 31707 Blagnac, Cedex, France, applied for a design change to 
Type Certificate No. A46NM for installation of seats that include non-
traditional, large, non-metallic panels in Airbus Model A330 series 
airplanes. These airplanes, currently approved under Type Certificate 
No. A46NM, are swept-wing, conventional-tail, twin-engine, turbofan- 
powered, twin-aisle, large-sized transport-category airplanes.
    The applicable regulations to airplanes currently approved under 
Type Certificate No. A46NM do not require seats to meet the more 
stringent flammability standards required of large, non-metallic panels 
in the cabin interior. At the time the applicable rules were written, 
seats were designed with a metal frame covered by fabric, not with 
large, non-metallic panels. Seats

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also met the then-recently adopted standards for flammability of seat 
cushions. With the seat design being mostly fabric and metal, the 
contribution to a fire in the cabin had been minimized and was not 
considered a threat. For these reasons, seats did not need to be tested 
to heat-release and smoke-emission requirements.
    Seat designs have now evolved to occasionally include non-
traditional, large, non-metallic panels. Taken in total, the surface 
area of these panels is on the same order as the sidewall and overhead 
stowage-bin interior panels. To provide the level of passenger 
protection intended by the airworthiness standards, these non-
traditional, large, non-metallic panels in the cabin must meet the 
standards of Title 14, Code of Federal Regulations (14 CFR), part 25, 
appendix F, parts IV and V, heat-release and smoke-emission 
requirements.

Type Certification Basis

    Under the provisions of Sec.  21.101, Airbus must show that the 
Model A330 series airplanes, as changed, continue to meet the 
applicable provisions of the regulations incorporated by reference in 
Type Certificate No. A46NM, or the applicable regulations in effect on 
the date of application for the change. The regulations incorporated by 
reference in the type certificate are commonly referred to as the 
``original type certification basis.'' The regulations incorporated by 
reference in Type Certificate No. A46NM are as follows: 14 CFR part 25, 
as amended by Amendments 25-1 through 25-63, 25-65, 25-66, 25-68, 25-
69, 25-73, 25-75, 25-77, 25-78, 25-81, 25-82, 25-84 and 25-85; certain 
regulations at Amendments 25-72 and 25-74; and Amendment 25-64 with 
exceptions. Refer to TCDS A46NM for a complete description of the 
certification basis for that model, including certain special 
conditions that are not relevant to these special conditions.
    If the Administrator finds that the applicable airworthiness 
regulations (i.e., 14 CFR part 25) do not contain adequate or 
appropriate safety standards for the Model A330 series airplanes 
because of a novel or unusual design feature, special conditions are 
prescribed under the provisions of Sec.  21.16.
    In addition to the applicable airworthiness regulations and special 
conditions, the Model A330 series airplanes must comply with the fuel-
vent and exhaust-emission requirements of 14 CFR part 34 and the noise-
certification requirements of 14 CFR part 36.
    The FAA issues special conditions, as defined in Sec.  11.19, under 
Sec.  11.38 and they become part of the type certification basis under 
Sec.  21.101.
    Special conditions are initially applicable to the model for which 
they are issued. Should the type certificate for that model be amended 
later to include any other model that incorporates the same novel or 
unusual design feature, or should any other model already included on 
the same type certificate be modified to incorporate the same novel or 
unusual design feature, the special conditions would also apply to the 
other model.

Novel or Unusual Design Features

    The Model A330 series airplanes will incorporate the following 
novel or unusual design features: These models offer interior 
arrangements that include passenger seats that incorporate non-
traditional, large, non-metallic panels in lieu of the traditional 
metal frame covered by fabric. The flammability properties of these 
panels have been shown to significantly affect the survivability of 
occupants of the cabin in the case of fire. These seats are considered 
a novel design for transport-category airplanes that include Amendment 
25-61 and Amendment 25-66 in the certification basis, and were not 
considered when those airworthiness standards were established.
    The existing regulations do not provide adequate or appropriate 
safety standards for seat designs that incorporate non-traditional, 
large, non-metallic panels. To provide a level of safety that is 
equivalent to that provided by the balance of the cabin, additional 
airworthiness standards, in the form of special conditions, are 
necessary. These special conditions supplement Sec.  25.853. The 
requirements contained in these special conditions consist of applying 
the identical test conditions, required of all other large panels in 
the cabin, to seats with non-traditional, large, non-metallic panels.

Definition of ``Non-Traditional, Large, Non-Metallic Panel''

    A non-traditional, large, non-metallic panel, in this case, is 
defined as a panel with exposed-surface areas greater than 1.5 square 
feet installed per seat place. The panel may consist of either a single 
component or multiple components in a concentrated area. Examples of 
parts of the seat where these non-traditional panels are installed 
include, but are not limited to: Seat backs and bottoms, leg/foot 
rests, kick panels, back shells, credenzas, and associated furniture. 
Examples of traditional exempted parts of the seat include: Arm caps, 
armrest close-outs such as end bays and armrest-styled center consoles, 
food trays, video monitors, and shrouds.

Clarification of ``Exposed''

    ``Exposed'' is considered to include those panels directly exposed 
to the passenger cabin in the traditional sense, plus those panels 
enveloped such as by a dress cover. Traditional fabrics or leathers 
currently used on seats are excluded from these special conditions. 
These materials still must comply with Sec.  25.853(a) and Sec.  
25.853(c) if used as a covering for a seat cushion, or Sec.  25.853(a) 
if installed elsewhere on the seat. Non-traditional, large, non-
metallic panels covered with traditional fabrics or leathers will be 
tested without their coverings or covering attachments.

Discussion

    In the early 1980s, the FAA conducted extensive research on the 
effects of post-crash flammability in the passenger cabin. As a result 
of this research and service experience, we adopted new standards for 
interior surfaces associated with large-surface-area parts. 
Specifically, the rules require measurement of heat release and smoke 
emission (part 25, Appendix F, parts IV and V) for the affected parts. 
Heat release has been shown to have a direct correlation with post-
crash fire survival time. Materials that comply with the standards 
(i.e., Sec.  25.853, entitled ``Compartment interiors,'' as amended by 
Amendment 25-61 and Amendment 25-66) extend survival time by 
approximately 2 minutes over materials that do not comply.
    At the time these standards were written, the FAA explored the 
potential application of the requirements of heat-release and smoke-
emission requirements to seats. The seat frame itself was not a concern 
because it was primarily made of aluminum and only small amounts of 
non-metallic materials. It was determined that the overall effect on 
survivability was negligible, whether or not the food trays met the 
heat-release and smoke-emission requirements. The requirements, 
therefore, did not address seats. The preambles to both the Notice of 
Proposed Rule Making (NPRM), Notice No. 85-10 (50 FR 15038, April 16, 
1985), and the Final Rule at Amendment 25-61 (51 FR 26206, July 21, 
1986), specifically note that seats were excluded ``because the 
recently-adopted standards for flammability of seat cushions will 
greatly inhibit involvement of the seats.''
    Subsequently, the Final Rule at Amendment 25-83 (60 FR 6615, March

[[Page 39]]

6, 1995) clarified the definition of minimum panel size: ``It is not 
possible to cite a specific size that will apply in all installations; 
however, as a general rule, components with exposed-surface areas of 
one square foot or less may be considered small enough that they do not 
have to meet the new standards. Components with exposed-surface areas 
greater than two square feet may be considered large enough that they 
do have to meet the new standards. Those with exposed-surface areas 
greater than one square foot, but less than two square feet, must be 
considered in conjunction with the areas of the cabin in which they are 
installed before a determination could be made.''
    In the late 1990s, the FAA issued Policy Memorandum 97-112-39, 
``Guidance for Flammability Testing of Seat/Console Installations,'' 
October 17, 1997 (http://rgl.faa.gov). That memo was issued when it 
became clear that seat designs were evolving to include large non-
metallic panels with surface areas that would impact survivability 
during a cabin fire event, comparable to partitions or galleys. The 
memo noted that large-surface-area panels must comply with heat-release 
and smoke-emission requirements, even if they were attached to a seat. 
If the FAA had not issued such policy, seat designs could have been 
viewed as a loophole to the airworthiness standards that would result 
in an unacceptable decrease in survivability during a cabin fire event.
    In October of 2004, an issue was raised regarding the appropriate 
flammability standards for passenger seats that incorporated non-
traditional, large, non-metallic panels in lieu of the traditional 
metal covered by fabric. The Seattle Aircraft Certification Office and 
Transport Standards Staff reviewed this design and determined that it 
represented the kind and quantity of material that should be required 
to pass the heat-release and smoke-emission requirements. We have 
determined that special conditions would be issued to apply the 
standards defined in Sec.  25.853(d) to seats with large, non-metallic 
panels in their design.

Applicability

    As discussed above, these special conditions are applicable to 
Airbus Model A330 series airplanes. Although the heat-release and 
smoke-emission testing requirements of Sec.  25.853, per Appendix F, 
parts IV and V, are not part of the part 25 certification basis for the 
Airbus Model A330 series airplanes, these special conditions are 
applicable if the airplanes are in 14 CFR part 121 service. Part 121 
requires applicable interior panels to comply with Sec.  25.853, 
Appendix F, parts IV and V, regardless of the certification basis. It 
is not our intent to require seats with large, non-metallic panels to 
meet Sec.  25.853, Appendix F, parts IV and V, if they are installed in 
cabins of airplanes that otherwise are not required to meet these 
standards. Should Airbus apply at a later date for a change to the type 
certificate to include another model incorporating the same novel or 
unusual design feature, the special conditions would apply to that 
model as well.

Conclusion

    This action affects only certain novel or unusual design features 
on Airbus Model A330 series airplanes. It is not a rule of general 
applicability.
    The substance of these special conditions has been subjected to the 
notice-and-comment period in several prior instances, and has been 
derived without substantive change from those previously issued. It is 
unlikely that prior public comment would result in a significant change 
from the substance contained herein. Therefore, the FAA has determined 
that prior public notice and comment are unnecessary, and good cause 
exists for adopting these special conditions upon issuance. The FAA is 
requesting comments to allow interested persons to submit views that 
may not have been submitted in response to the prior opportunities for 
comment described above.

List of Subjects in 14 CFR Part 25

    Aircraft, Aviation safety, Reporting and recordkeeping 
requirements.

    The authority citation for these special conditions is as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701, 44702, 44704.

The Special Conditions

    Accordingly, pursuant to the authority delegated to me by the 
Administrator, the following special conditions are issued as part of 
the type certification basis for Airbus Model A330 series airplanes.
    1. Compliance with 14 CFR part 25, appendix F, parts IV and V, heat 
release and smoke emission, is required for seats that incorporate non-
traditional, large, non-metallic panels that may be either a single 
component or multiple components in a concentrated area in their 
design. Traditional panels are exempted.
    2. The applicant may designate up to and including 1.5 square feet 
of non-traditional, non-metallic panel material per seat place that 
does not have to comply with No. 1. A triple-seat assembly may have a 
total of 4.5 square feet excluded on any portion of the assembly (e.g., 
outboard seat place, 1 sq. ft.; middle, 1 sq. ft.; and inboard, 2.5 sq. 
ft.).
    3. Seats need not meet the test requirements of 14 CFR part 25, 
appendix F, parts IV and V, when installed in compartments that are not 
otherwise required to meet these requirements. Examples include:
    a. Airplanes with passenger capacities of 19 or less,
    b. Airplanes that do not have smoke-and-heat release in their 
certification basis, and do not need to comply with the requirements 
per 14 CFR 121.312,
    c. Airplanes exempted from smoke-and-heat-release requirements.
    4. The applicability requirements fall into two categories: either 
new-seat certification program or previously certified. New-seat 
certification programs must meet the special conditions, previously 
certified are not required to.

    Issued in Renton, Washington, on December 28, 2009.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. E9-31118 Filed 12-31-09; 8:45 am]
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