
[Federal Register: February 22, 2008 (Volume 73, Number 36)]
[Rules and Regulations]               
[Page 9661-9663]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr22fe08-3]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2007-0335; Directorate Identifier 2007-NM-292-AD; 
Amendment 39-15380; AD 2008-04-08]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional 
Jet Series 100 & 440) Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are adopting a new airworthiness directive (AD) for the 
products listed above. This AD results from mandatory continuing 
airworthiness information (MCAI) originated by an aviation authority of 
another country to identify and correct an unsafe condition on an 
aviation product. The MCAI describes the unsafe condition as:

    Bombardier Aerospace has completed a system safety review of the 
CL-600-2B19 aircraft fuel system against new fuel tank safety 
standards, introduced in Chapter 525 of the Airworthiness Manual 
through Notice of Proposed Amendment (NPA) 2002-043. The identified 
non-compliances were assessed using Transport Canada Policy Letter 
No. 525-001 to determine if mandatory corrective action is required.
    The assessment and lightning tests showed that certain fuel tube 
self-bonded couplings do not provide sufficient lightning current 
capability. The assessment also showed that single failure of the 
integral bonding wire of the self-bonded couplings or excessive 
axial clearance at the reducer ferrules of certain self-bonded 
couplings could affect electrical bonding between fuel tubes.
    Insufficient electrical bonding between fuel tubes or 
insufficient current capability of fuel tube couplings, if not 
corrected, could result in arcing and potential ignition source 
inside the fuel tank during lightning strikes and consequent fuel 
tank explosion. * * *

We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective March 28, 2008.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of March 28, 
2008.

ADDRESSES: You may examine the AD docket on the Internet at http://
www.regulations.gov or in person at the U.S. Department of 
Transportation, Docket Operations, M-30, West Building Ground Floor, 
Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC.

FOR FURTHER INFORMATION CONTACT: Rocco Viselli, Aerospace Engineer, 
Airframe and Propulsion Branch, ANE-171, FAA, New York Aircraft 
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New 
York 11590; telephone (516) 228-7331; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to include an AD that would apply to the specified products. 
That NPRM was published in the Federal Register on December 17, 2007 
(72 FR 71273). That NPRM proposed to correct an unsafe condition for 
the specified products. The MCAI states:

    Bombardier Aerospace has completed a system safety review of the 
CL-600-2B19 aircraft fuel system against new fuel tank safety 
standards, introduced in Chapter 525 of the Airworthiness Manual 
through Notice of Proposed Amendment (NPA) 2002-043. The identified 
non-compliances were assessed using Transport Canada Policy Letter 
No. 525-001 to determine if mandatory corrective action is required.
    The assessment and lightning tests showed that certain fuel tube 
self-bonded couplings do not provide sufficient lightning current 
capability. The assessment also showed that single failure of the 
integral bonding wire of the self-bonded couplings or excessive 
axial clearance at the reducer ferrules of certain self-bonded 
couplings could affect electrical bonding between fuel tubes.
    Insufficient electrical bonding between fuel tubes or 
insufficient current capability of fuel tube couplings, if not 
corrected, could result in arcing and potential ignition source 
inside the fuel tank during lightning strikes and consequent fuel 
tank explosion. To correct the unsafe condition, this directive 
mandates the replacement of certain fuel tube couplings with 
redesigned couplings.

For certain couplings, the replacement includes a detailed inspection 
for wear of the sleeve and coupling and applicable corrective actions 
(including installing new O-rings and sleeves). You may obtain further 
information by examining the MCAI in the AD docket.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM or on the determination of 
the cost to the public.

Conclusion

    We reviewed the available data and determined that air safety and 
the public interest require adopting the AD as proposed.

Differences Between This AD and the MCAI or Service Information

    We have reviewed the MCAI and related service information and, in 
general, agree with their substance. But we might have found it 
necessary to use different words from those in the MCAI to ensure the 
AD is clear for U.S. operators and is enforceable. In making these 
changes, we do not intend to differ substantively from the information 
provided in the MCAI and related service information.
    We might also have required different actions in this AD from those 
in the MCAI in order to follow our FAA policies. Any such differences 
are highlighted in a NOTE within the AD.

Costs of Compliance

    We estimate that this AD will affect about 692 products of U.S. 
registry. We

[[Page 9662]]

also estimate that it will take about 21 work-hours per product to 
comply with the basic requirements of this AD. The average labor rate 
is $80 per work-hour. Required parts will cost about $2,417 per 
product. Where the service information lists required parts costs that 
are covered under warranty, we have assumed that there will be no 
charge for these parts. As we do not control warranty coverage for 
affected parties, some parties may incur costs higher than estimated 
here. Based on these figures, we estimate the cost of this AD to the 
U.S. operators to be $2,835,124, or $4,097 per product.

Authority for This Rulemaking

    Title 49 of the United States Code specifies the FAA's authority to 
issue rules on aviation safety. Subtitle I, section 106, describes the 
authority of the FAA Administrator. ``Subtitle VII: Aviation 
Programs,'' describes in more detail the scope of the Agency's 
authority.
    We are issuing this rulemaking under the authority described in 
``Subtitle VII, Part A, Subpart III, Section 44701: General 
requirements.'' Under that section, Congress charges the FAA with 
promoting safe flight of civil aircraft in air commerce by prescribing 
regulations for practices, methods, and procedures the Administrator 
finds necessary for safety in air commerce. This regulation is within 
the scope of that authority because it addresses an unsafe condition 
that is likely to exist or develop on products identified in this 
rulemaking action.

Regulatory Findings

    We determined that this AD will not have federalism implications 
under Executive Order 13132. This AD will not have a substantial direct 
effect on the States, on the relationship between the national 
government and the States, or on the distribution of power and 
responsibilities among the various levels of government.
    For the reasons discussed above, I certify this AD:
    1. Is not a ``significant regulatory action'' under Executive Order 
12866;
    2. Is not a ``significant rule'' under the DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979); and
    3. Will not have a significant economic impact, positive or 
negative, on a substantial number of small entities under the criteria 
of the Regulatory Flexibility Act.
    We prepared a regulatory evaluation of the estimated costs to 
comply with this AD and placed it in the AD docket.

Examining the AD Docket

    You may examine the AD docket on the Internet at http://
www.regulations.gov; or in person at the Docket Operations office 
between 9 a.m. and 5 p.m., Monday through Friday, except Federal 
holidays. The AD docket contains the NPRM, the regulatory evaluation, 
any comments received, and other information. The street address for 
the Docket Operations office (telephone (800) 647-5527) is in the 
ADDRESSES section. Comments will be available in the AD docket shortly 
after receipt.

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

Adoption of the Amendment

0
Accordingly, under the authority delegated to me by the Administrator, 
the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

0
1. The authority citation for part 39 continues to read as follows:

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


Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new AD:

2008-04-08 Bombardier, Inc. (Formerly Canadair): Amendment 39-15380. 
Docket No. FAA-2007-0335; Directorate Identifier 2007-NM-292-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective March 
28, 2008.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier Model CL-600-2B19 (Regional 
Jet Series 100 & 440) airplanes, certificated in any category, 
serial numbers 7003 through 7067, and 7069 through 7981.

Subject

    (d) Air Transport Association (ATA) of America Code 28: Fuel.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    Bombardier Aerospace has completed a system safety review of the 
CL-600-2B19 aircraft fuel system against new fuel tank safety 
standards, introduced in Chapter 525 of the Airworthiness Manual 
through Notice of Proposed Amendment (NPA) 2002-043. The identified 
non-compliances were assessed using Transport Canada Policy Letter 
No. 525-001 to determine if mandatory corrective action is required.
    The assessment and lightning tests showed that certain fuel tube 
self-bonded couplings do not provide sufficient lightning current 
capability. The assessment also showed that single failure of the 
integral bonding wire of the self-bonded couplings or excessive 
axial clearance at the reducer ferrules of certain self-bonded 
couplings could affect electrical bonding between fuel tubes.
    Insufficient electrical bonding between fuel tubes or 
insufficient current capability of fuel tube couplings, if not 
corrected, could result in arcing and potential ignition source 
inside the fuel tank during lightning strikes and consequent fuel 
tank explosion. To correct the unsafe condition, this directive 
mandates the replacement of certain fuel tube couplings with 
redesigned couplings.

For certain couplings, the replacement includes a detailed 
inspection for wear of the sleeve and coupling and applicable 
corrective actions (including installing new O-rings and sleeves).

Actions and Compliance

    (f) Within 5000 flight hours after the effective date of this 
AD, unless already done, replace fuel tube couplings inside the wing 
and center fuel tanks with redesigned couplings, in accordance with 
the Accomplishment Instructions of Bombardier Service Bulletin 601R-
28-054, Revision A, dated August 7, 2006. Do all applicable 
inspections and corrective actions before further flight.

FAA AD Differences

    Note: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (g) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York Aircraft Certification Office, FAA, has the authority to 
approve AMOCs for this AD, if requested using the procedures found 
in 14 CFR 39.19. Send information to ATTN: Rocco Viselli, Aerospace 
Engineer, Airframe and Propulsion Branch, ANE-171, FAA, New York 
Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, 
Westbury, New York 11590; telephone (516) 228-7331; fax (516) 794-
5531. Before using any approved AMOC on any airplane to which the 
AMOC applies, notify your appropriate principal inspector (PI) in 
the FAA Flight Standards District Office (FSDO), or lacking a PI, 
your local FSDO.
    (2) Airworthy Product: For any requirement in this AD to obtain 
corrective actions from a manufacturer or other source, use these 
actions if they are FAA-approved. Corrective actions are considered 
FAA-approved if they are approved by the State of Design Authority 
(or their delegated agent). You are required to assure the product 
is airworthy before it is returned to service.
    (3) Reporting Requirements: For any reporting requirement in 
this AD, under the provisions of the Paperwork Reduction Act, the 
Office of Management and Budget (OMB) has approved the information 
collection requirements and has assigned OMB Control Number 2120-
0056.

[[Page 9663]]

Related Information

    (h) Refer to MCAI Canadian Airworthiness Directive CF-2007-23, 
dated October 18, 2007, and Bombardier Service Bulletin 601R-28-054, 
Revision A, dated August 7, 2006, for related information.

Material Incorporated by Reference

    (i) You must use Bombardier Service Bulletin 601R-28-054, 
Revision A, dated August 7, 2006, to do the actions required by this 
AD, unless the AD specifies otherwise.
    (1) The Director of the Federal Register approved the 
incorporation by reference of this service information under 5 
U.S.C. 552(a) and 1 CFR part 51.
    (2) For service information identified in this AD, contact 
Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station 
Centre-ville, Montreal, Quebec H3C 3G9, Canada.
    (3) You may review copies at the FAA, Transport Airplane 
Directorate, 1601 Lind Avenue, SW., Renton, Washington; or at the 
National Archives and Records Administration (NARA). For information 
on the availability of this material at NARA, call (202) 741-6030, 
or go to: http://www.archives.gov/federal-register/cfr/ibr-
locations.html.

    Issued in Renton, Washington, on February 13, 2008.
Stephen P. Boyd,
Assistant Manager, Transport Airplane Directorate, Aircraft 
Certification Service.
 [FR Doc. E8-3070 Filed 2-21-08; 8:45 am]

BILLING CODE 4910-13-P
