Skip to Content


Special Conditions: Embraer Model ERJ 170-100 SU Series Airplanes; Seats With Non-Traditional, Large, Non-Metallic Panels

Document Details

Information about this document as published in the Federal Register.

Published Document

This document has been published in the Federal Register. Use the PDF linked in the document sidebar for the official electronic format.

Start Preamble


Federal Aviation Administration (FAA), DOT.


Final special conditions; request for comments.


These special conditions are issued for the Embraer Model ERJ 170-100 SU series airplanes. These airplanes, as modified by C&D Zodiac, Inc., will have a novel or unusual design feature 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.


The effective date of these special conditions is August 18, 2010. We must receive your comments by September 27, 2010.


You must mail two copies of your comments to: Federal Aviation Administration, Transport Airplane Directorate, Attn: Rules Docket (ANM-113), Docket No. NM433, 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. NM433. You can inspect comments in the Rules Docket weekdays, except Federal holidays, between 7:30 a.m. and 4 p.m.

Start Further Info


Jayson Claar, FAA, ANM-115, Transport Airplane Directorate, Aircraft Certification Service, 16501 Lind Avenue, SW., Renton, WA 98057-3356; telephone (425) 227-2194; facsimile (425) 227-1232.

End Further Info End Preamble Start Supplemental 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 acknowledge receipt of your comments on these special conditions, include with your comments a self-addressed, stamped postcard on which you have written the docket number. We will stamp the date on the postcard and mail it back to you.


On June 16, 2010, C&D Zodiac, Inc., 5701 Bolsa Ave,, Huntington Beach, California 92647, applied for a Supplemental Type Certificate (STC) for an interior modification to include seats with large, non-metallic panels in the cabin interior in the Embraer Model ERJ 170-100 SU series airplanes. The Model ERJ 170-100 SU, which is currently approved under Type Certificate No. A56NM, is a 76 passenger, twin-engine regional jet with a maximum takeoff weight of 82,011 pounds.

The applicable airplane regulations, currently approved under Title 14, Code of Federal Regulations (14 CFR) part 25, 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 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 part 25, Appendix F, parts IV and V, heat-release and smoke-emission requirements. Start Printed Page 52615

Type Certification Basis

Under the provisions of § 21.101, C&D Zodiac, Inc., must show that the Model ERJ 170-100 SU, as changed, continues to meet the applicable provisions of the regulations incorporated by reference in Type Certificate No. A56NM. 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. A56NM are as follows: 14 CFR part 25, as amended by Amendments 25-1 through 25-101.

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 ERJ-170-100 SU, because of a novel or unusual design feature, special conditions are prescribed under the provisions of § 21.16.

In addition to the applicable airworthiness regulations and special conditions, the Model ERJ 170-100 SU 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 14 CFR 11.19, in accordance with § 11.38, and they become part of the type-certification basis under § 21.101.

Special conditions are initially applicable to the model for which they are issued. Should the applicant apply for an STC to modify any other model included on the same type certificate 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 ERJ 170-100 SU 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 event 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 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 § 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, bottoms and leg/foot rests, kick panels, back shells, and 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, and 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 must still comply with §§ 25.853(a) and 25.853(c) if used as a covering for a seat cushion, or § 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.


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 larger 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. The materials that comply with the standards (i.e., § 25.853, titled “Compartment Interiors,” as amended by Amendments 25-61 and 25-66) extended survival time by approximately 2 minutes over materials that do not comply.

At the time Amendment 25-61 was written, the potential application of the requirement to seats was explored. The seat frame itself was not a concern because it was primarily made of aluminum and included only small amounts of non-metallic materials (for example, a food tray table and armrest closeout). It was determined that the overall effect on survivability was negligible, whether or not these panels met the heat-release and smoke-emission requirements. The requirements therefore did not address seats, and the preambles to both Notice of Proposed Rule Making (NPRM) 85-10 and the final rule (Amendment 25-61) specifically noted that they were excluded “because the recently adopted standards for flammability of seat cushions will greatly inhibit involvement of the seats.”

In the late 1990s, 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 compared to partitions or galleys, the FAA issued Policy Memorandum 97-112-39. This 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 a policy, seat designs would have been viewed as a loophole to the airworthiness standards that would result in an unacceptable decrease in survivability during a cabin fire event.


As discussed above, these special conditions are applicable to the Model ERJ 170-100 SU series airplanes. Should C&D Zodiac, Inc., apply at a later date for an STC to modify any other model included on Type Certificate No. A56NM to incorporate the same novel or unusual design feature, these special conditions would apply to that model as well.


This action affects only certain novel or unusual design features on Embraer Model ERJ 170-100 SU series airplanes. It is not a rule of general applicability and affects only the applicant who applied to the FAA for approval of these features on the airplane.

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 Start Printed Page 52616prior public comment would result in a significant change from the substance contained herein. Therefore, because a delay would significantly affect the certification of the airplane, which is imminent, the FAA has determined that prior public notice and comment are unnecessary and impracticable, 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.

Start List of Subjects

List of Subjects in 14 CFR Part 25

End List of Subjects

The authority citation for these special conditions is as follows:

Start Authority

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

End Authority

The Special Conditions

Start Amendment Part

Accordingly, pursuant to the authority delegated to me by the Administrator, the following special conditions are issued as part of the supplemental type certification basis for Embraer Model ERJ 170-100 SU series airplanes modified by C&D Zodiac, Inc.

End Amendment Part

1. Except as provided in special condition number 3, below, compliance with heat-release and smoke-emission testing requirements of § 25.853, and Appendix F, parts IV and V, 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.

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 special condition number 1, above. 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 square foot; middle, 1 square foot; and inboard, 2.5 square feet).

3. Seats do not have to meet the test requirements of 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 § 25.853, Amendment 25-61 or later, in their certification basis and do not need to comply with the requirements of § 121.312, and

c. Airplanes exempted from § 25.853, Amendment 25-61 or later.

Start Signature

Issued in Renton, Washington, on August 18, 2010.

Jeffrey E. Duven,

Acting Manager, Transport Airplanes Directorate, Aircraft Certification Service.

End Signature End Supplemental Information

[FR Doc. 2010-21449 Filed 8-26-10; 8:45 am]