AD 2007-04-24

[Federal Register Volume 72, Number 38 (Tuesday, February 27, 2007)]
[Rules and Regulations]
[Pages 8620-8622]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: E7-2973]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2006-26647; Directorate Identifier 2006-NM-194-AD; 
Amendment 39-14957; AD 2007-04-24]
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: The FAA is adopting a new airworthiness directive (AD) for 
certain Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) 
airplanes. This AD requires repetitive inspections of the bolts that 
attach the exhaust nozzle to the aft engine flange to determine if any 
bolts are missing or fractured, and replacement of the existing bolts 
with new, improved bolts. This AD results from reports of the engine 
exhaust nozzle and fairing departing from the airplane in flight due to 
missing attachment bolts. We are issuing this AD to detect and correct 
missing or fractured attachment bolts, which could lead to the loss of 
an engine exhaust nozzle during flight and consequent structural damage 
to the airplane and hazard to people or property on the ground. Damage 
to the airplane could cause the airplane to yaw and result in reduced 
controllability of the airplane.

DATES: This AD becomes effective April 3, 2007.
    The Director of the Federal Register approved the incorporation by 
reference

[[Page 8621]]

of a certain publication listed in the AD as of April 3, 2007.

ADDRESSES: You may examine the AD docket on the Internet at <a href="http://dms.dot.gov">http://dms.dot.gov</a> or in person at the Docket Management Facility, U.S. 
Department of Transportation, 400 Seventh Street SW., Nassif Building, 
Room PL-401, Washington, DC.
    Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, 
Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for service 
information identified in this AD.

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: 

Examining the Docket

    You may examine the airworthiness directive (AD) docket on the 
Internet at <a href="http://dms.dot.gov">http://dms.dot.gov</a> or in person at the Docket Management 
Facility office between 9 a.m. and 5 p.m., Monday through Friday, 
except Federal holidays. The Docket Management Facility office 
(telephone (800) 647-5227) is located on the plaza level of the Nassif 
Building at the street address stated in the ADDRESSES section.

Discussion

    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 to include an AD that would apply to certain Bombardier 
Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. That NPRM 
was published in the Federal Register on December 26, 2006 (71 FR 
77312). That NPRM proposed to require repetitive inspections of the 
bolts that attach the exhaust nozzle to the aft engine flange to 
determine if any bolts are missing or fractured, and replacement of the 
existing bolts with new, improved bolts.

Comments

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

Conclusion

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

Costs of Compliance

    The following table provides the estimated costs for U.S. operators 
to comply with this AD.

                                                                     Estimated Costs
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                    Average                                                         Number of
                                           Work      labor                                                            U.S.-
                Action                    hours     rate per            Parts                Cost per airplane      registered         Fleet cost
                                                      hour                                                          airplanes
--------------------------------------------------------------------------------------------------------------------------------------------------------
Inspection, per inspection cycle......          2        $80  None.....................  $160, per inspection              686  $109,760, per inspection
                                                                                          cycle.                                 cycle.
Replacement...........................          4        $80  $513.....................  $833....................          686  $571,438.
--------------------------------------------------------------------------------------------------------------------------------------------------------

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 have 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 that this AD:
    (1) Is not a ``significant regulatory action'' under Executive 
Order 12866;
    (2) Is not a ``significant rule'' under 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. See the ADDRESSES 
section for a location to examine the regulatory evaluation.

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 Federal Aviation Administration (FAA) amends Sec.  39.13 by 
adding the following new airworthiness directive (AD):

2007-04-24 Bombardier, Inc. (Formerly Canadair): Amendment 39-14957. 
Docket No. FAA-2006-26647; Directorate Identifier 2006-NM-194-AD.

Effective Date

    (a) This AD becomes effective April 3, 2007.

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 (S/Ns) 7003 through 7067 inclusive and S/Ns 7069 
through 7947 inclusive.

Unsafe Condition

    (d) This AD results from reports of the engine exhaust nozzle 
and fairing departing from the airplane in flight due to missing

[[Page 8622]]

attachment bolts. We are issuing this AD to detect and correct 
missing or fractured attachment bolts, which could lead to the loss 
of an engine exhaust nozzle during flight and consequent structural 
damage to the airplane and hazard to people or property on the 
ground. Damage to the airplane could cause the airplane to yaw and 
result in reduced controllability of the airplane.

Compliance

    (e) You are responsible for having the actions required by this 
AD performed within the compliance times specified, unless the 
actions have already been done.

Repetitive Inspections

    (f) Within 1,500 flight hours after the effective date of this 
AD: For the left and right engine exhaust nozzles, do a detailed 
inspection of the bolts that attach the exhaust nozzle to the aft 
engine flange to determine if any bolts are missing or fractured, in 
accordance with Part A of the Accomplishment Instructions of 
Bombardier Service Bulletin 601R-78-021, dated June 2, 2006. If no 
bolt of an engine exhaust nozzle is missing or fractured, repeat the 
detailed inspection for that engine exhaust nozzle thereafter at 
intervals not to exceed 1,500 flight hours, until the replacement 
specified in paragraph (g) or (h) of this AD is accomplished.

    Note 1: For the purposes of this AD, a detailed inspection is: 
``An intensive examination of a specific item, installation, or 
assembly to detect damage, failure, or irregularity. Available 
lighting is normally supplemented with a direct source of good 
lighting at an intensity deemed appropriate. Inspection aids such as 
mirror, magnifying lenses, etc., may be necessary. Surface cleaning 
and elaborate procedures may be required.''

Corrective Action, if Necessary

    (g) If any bolt of an engine exhaust nozzle is found missing or 
fractured during any inspection required by paragraph (f) of this 
AD, before further flight, replace the existing bolts that attach 
the exhaust nozzle to the aft engine flange with new, improved 
bolts, in accordance with Part B of the Accomplishment Instructions 
of Bombardier Service Bulletin 601R-78-021, dated June 2, 2006. 
Accomplishing the bolt replacement for an engine exhaust nozzle 
terminates the repetitive inspections required by paragraph (f) of 
this AD for that engine exhaust nozzle only.

    Note 2: Bombardier Service Bulletin 601R-78-021, dated June 2, 
2006, refers to Bombardier Service Bulletin CF34-NAC-78-024, 
Revision 4, dated November 10, 2005, as an additional source of 
service information for accomplishment of the replacement.

Terminating Action

    (h) Within 4,000 flight hours after the effective date of this 
AD: For the left and right engine exhaust nozzles, replace the 
existing bolts that attach the exhaust nozzle to the aft engine 
flange with new, improved bolts, in accordance with Part B of the 
Accomplishment Instructions of Bombardier Service Bulletin 601R-78-
021, dated June 2, 2006. Accomplishing the replacement for the left 
and right engine exhaust nozzles terminates all of the inspections 
required by paragraph (f) of this AD.

Alternative Methods of Compliance (AMOCs)

    (i)(1) The Manager, New York Aircraft Certification Office, FAA, 
has the authority to approve AMOCs for this AD, if requested in 
accordance with the procedures found in 14 CFR 39.19.
    (2) Before using any AMOC approved in accordance with Sec.  
39.19 on any airplane to which the AMOC applies, notify the 
appropriate principal inspector in the FAA Flight Standards 
Certificate Holding District Office.

Related Information

    (j) Canadian airworthiness directive CF-2006-19, dated July 28, 
2006, also addresses the subject of this AD.

Material Incorporated by Reference

    (k) You must use Bombardier Service Bulletin 601R-78-021, dated 
June 2, 2006, to perform the actions that are required by this AD, 
unless the AD specifies otherwise. The Director of the Federal 
Register approved the incorporation by reference of this document in 
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact 
Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087, Station 
Centre-ville, Montreal, Quebec H3C 3G9, Canada, for a copy of this 
service information. You may review copies at the FAA, Transport 
Airplane Directorate, 1601 Lind Avenue, S.W., 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: <a href="http://www.archives.gov/federal-register/cfr/ibr-locations.html">http://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.

    Issued in Renton, Washington, on February 13, 2007.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
 [FR Doc. E7-2973 Filed 2-26-07; 8:45 am]
BILLING CODE 4910-13-P