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contains regulatory documents having general

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are keyed to and codified in the Code of

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Rules and Regulations Federal Register

9379 

Vol. 79, No. 33 

Wednesday, February 19, 2014 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 25 

[Docket No. FAA–2013–0858; Special 

Conditions No. 25–518–SC] 

Special Conditions: Bombardier Inc., 

Models BD–500–1A10 and BD–500– 

1A11 Series Airplanes; Fuselage PostCrash Fire Survivability 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final special conditions. 

SUMMARY: These special conditions are 

issued for the Bombardier Inc. Models 

BD–500–1A10 and BD–500–1A11 series 

airplanes. These airplanes will have 

novel or unusual design features when 

compared to the state of technology 

envisioned in the airworthiness 

standards for transport category 

airplanes. These features are associated 

with an aluminum-lithium fuselage 

construction that may provide different 

levels of protection from post-crash fire 

threats than similar aircraft constructed 

from traditional aluminum structure. 

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: Effective Date: March 21, 2014. 

FOR FURTHER INFORMATION CONTACT: 

Alan Sinclair, FAA, Airframe and Cabin 

Safety Branch, ANM–115, Transport 

Airplane Directorate, Aircraft 

Certification Service, 1601 Lind Avenue 

SW., Renton, Washington, 98057–3356; 

telephone (425) 227–2195; facsimile 

(425) 227–1232. 

SUPPLEMENTARY INFORMATION: 

Background 

On December 10, 2009, Bombardier 

Inc. applied for a type certificate for 

their new Models BD–500–1A10 and 

BD–500–1A11 series airplanes (hereafter 

collectively referred to as ‘‘C-series’’). 

The C-series airplanes are swept-wing 

monoplanes with an aluminum alloy 

fuselage sized for 5-abreast seating. 

Passenger capacity is designated as 110 

for the Model BD–500–1A10 and 125 for 

the Model BD–500–1A11. Maximum 

takeoff weight is 131,000 pounds for the 

Model BD–500–1A10 and 144,000 

pounds for the Model BD–500–1A11. 

The fuselage of the Bombardier Cseries airplanes will be fabricated using 

aluminum-lithium construction. 

Structures fabricated from aluminumlithium may provide different levels of 

protection from post-crash fuel-fed fire 

threats than similar aircraft with 

traditional aluminum structure. 

There are no existing regulations that 

adequately ensure that aluminumlithium structure offers passengers the 

same protection from a post-crash fire 

condition as would a conventional 

aluminum structure. These special 

conditions are necessary to ensure that 

the Bombardier C-series airplanes 

provide a level of safety equivalent to 

that provided by Title 14, Code of 

Federal Regulations (14 CFR) part 25. 

Type Certification Basis 

Under the provisions of Title 14, Code 

of Federal Regulations (14 CFR) 21.17, 

Bombardier Inc. must show that the Cseries airplanes meet the applicable 

provisions of part 25, as amended by 

Amendment 25–1 through 25–129 

thereto. 

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 C-series airplanes because of a 

novel or unusual design feature, special 

conditions are prescribed under the 

provisions of § 21.16. 

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, the special conditions 

would also apply to the other model 

under § 21.101. 

In addition to the applicable 

airworthiness regulations and special 

conditions, the C-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; and the 

FAA must issue a finding of regulatory 

adequacy under § 611 of Public Law 92– 

574, the ‘‘Noise Control Act of 1972.’’ 

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 

§ 21.17(a)(2). 

Novel or Unusual Design Features 

The Bombardier C-series airplanes 

will incorporate the following novel or 

unusual design features: The fuselage 

will be fabricated using aluminumlithium materials instead of 

conventional aluminum. 

The performance of airplanes 

consisting of a conventional aluminum 

fuselage is understood based on service 

history and extensive intermediate and 

large-scale fire testing. The new 

aluminum-lithium materials must 

provide the same levels of protection 

against post-crash fuel-fed fire threats. 

Discussion 

The certification basis for the 

Bombardier C-series airplanes includes 

meeting the burn through requirements 

defined in § 25.856(b). The Bombardier 

C-series airplanes are introducing a new 

material from what has traditionally 

been shown to be survivable from a 

toxic standpoint. Toxicity levels from 

post-crash fire threats are typically more 

severe than threats generated from an 

in-flight fire with regards to the quantity 

level of toxins produced by off-gases 

from burning materials. Therefore, it is 

necessary to ensure that the material 

being used does not introduce a new 

hazard that would reduce the 

survivability of the passengers during a 

post-crash situation, or produce levels 

of toxic fumes that would be lethal or 

incapacitating, thus preventing 

evacuation of the aircraft in a crash 

scenario. 

Bombardier Inc. will have to 

demonstrate that aluminum-lithium 

material does not produce levels of toxic 

fumes that will reduce the survivability 

of the passengers or their ability to 

evacuate when compared to typically 

constructed aluminum airplanes. 

A way of showing acceptable 

capability is to conduct a laboratoryscale test to assess the survivability 


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9380 Federal Register / Vol. 79, No. 33 / Wednesday, February 19, 2014 / Rules and Regulations 

characteristics of this non-traditional 

fuselage material. If negligible amounts 

of combustion products are produced in 

this test, the material can be considered 

acceptable with respect to post crash 

survivability. A test method developed 

by the FAA’s William J. Hughes 

Technical Center should be used (Ref. 

DOT/FAA/AR–TN07/15 dated August 

2008). 

Related regulations, including 

§§ 25.853 and 25.856(a), remain valid 

for this airplane, but they do not reflect 

the potential threat generated from toxic 

levels of gases produced from 

aluminum-lithium materials. 

Discussion of Comments 

Notice of proposed special conditions 

No. 25–13–08–SC for the Bombardier Cseries airplanes was published in the 

Federal Register on October 31, 2013 

(78 FR 65233). No comments were 

received, and the special conditions are 

adopted as proposed. 

Applicability 

As discussed above, these special 

conditions are applicable to the Models 

BD–500–1A10 and BD–500–1A11 series 

airplanes. Should Bombardier Inc. apply 

at a later date for a change to the type 

certificate to include another model on 

the same type certificate 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 two 

model series of airplanes. It is not a rule 

of general applicability. 

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 Bombardier Inc. 

Models BD–500–1A10 and BD–500– 

1A11 (C-series) airplanes. 

Fuselage Post-Crash Fire 

Survivability. The Bombardier C-series 

airplanes must show that any toxic 

levels of gases produced from the 

aluminum-lithium material are in no 

way an additional threat to the 

passengers and their ability to evacuate 

when compared to a typically 

constructed aluminum airplane exposed 

to a post-crash fuel-fed fire. 

Issued in Renton, Washington, on January 

22, 2014. 

Jeffrey E. Duven, 

Manager, Transport Airplane Directorate, 

Aircraft Certification Service. 

[FR Doc. 2014–03585 Filed 2–18–14; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 25 

[Docket No. FAA–2013–0819; Special 

Conditions No. 25–519–SC] 

Special Conditions: Bombardier Inc., 

Models BD–500–1A10 and BD–500– 

1A11 Series Airplanes; Fuselage InFlight Fire Safety and Flammability 

Resistance 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final special conditions. 

SUMMARY: These special conditions are 

issued for the Bombardier Inc. Models 

BD–500–1A10 and BD–500–1A11 series 

airplanes. These airplanes will have 

novel or unusual design features when 

compared to the state of technology 

envisioned in the airworthiness 

standards for transport category 

airplanes. These features are associated 

with the materials used to fabricate the 

fuselage, which may affect fire 

propagation during an in-flight fire. 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: Effective Date: March 21, 2014. 

FOR FURTHER INFORMATION CONTACT: 

Alan Sinclair, FAA, Airframe and Cabin 

Safety Branch, ANM–115, Transport 

Airplane Directorate, Aircraft 

Certification Service, 1601 Lind Avenue 

SW., Renton, Washington 98057–3356; 

telephone 425–227–2195; facsimile 

425–227–1232. 

SUPPLEMENTARY INFORMATION: 

Background 

On December 10, 2009, Bombardier 

Inc. applied for a type certificate for 

their new Models BD–500–1A10 and 

BD–500–1A1 series airplanes (hereafter 

collectively referred to as ‘‘C-series’’). 

The C-series airplanes are swept-wing 

monoplanes with an aluminum alloy 

fuselage sized for 5-abreast seating. 

Passenger capacity is designated as 110 

for the Model BD–500–1A10 and 125 for 

the Model BD–500–1A11. Maximum 

takeoff weight is 131,000 pounds for the 

Model BD–500–1A10 and 144,000 

pounds for the Model BD–500–1A11. 

The Bombardier C-series airplanes 

will be fabricated using aluminumlithium materials. The performance of 

airplanes consisting of a conventional 

aluminum fuselage in an inaccessible 

in-flight fire scenario is understood 

based on service history and extensive 

intermediate and large-scale fire testing. 

The fuselage itself does not contribute to 

in-flight fire propagation. This may not 

be the case for an all-aluminum-lithium 

fuselage. Experience has shown that 

eliminating the fire propagation of the 

interior materials and insulation 

materials tends to increase survivability 

since other aspects of in-flight fire safety 

(e.g., toxic gas emission and smoke 

obscuration) are typically by-products of 

the propagating fire. The Bombardier Cseries airplanes must provide protection 

against an in-flight fire propagating 

along the surface of the fuselage. 

Type Certification Basis 

Under the provisions of Title 14, Code 

of Federal Regulations (14 CFR) 21.17, 

Bombardier Inc. must show that the Cseries airplanes meet the applicable 

provisions of part 25, as amended by 

Amendment 25–1 through 25–129 

thereto. 

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 C-series airplanes because of a 

novel or unusual design feature, special 

conditions are prescribed under the 

provisions of § 21.16. 

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, the special conditions 

would also apply to the other model 

under § 21.101. 

In addition to the applicable 

airworthiness regulations and special 

conditions, the C-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; and the 

FAA must issue a finding of regulatory 

adequacy under § 611 of Public Law 92– 

574, the ‘‘Noise Control Act of 1972.’’ 

The FAA issues special conditions, as 

defined in 14 CFR 11.19, in accordance 

with § 11.38, and they become part of 


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