
[Federal Register: September 27, 2010 (Volume 75, Number 186)]
[Rules and Regulations]               
[Page 59071-59073]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr27se10-9]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0439; Directorate Identifier 2010-NM-029-AD; 
Amendment 39-16437; AD 2010-20-03]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier, Inc. Model CL-600-2B16 (CL-
604 Variants (Including CL-605 Marketing Variant)) 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:

    Following five reported cases of * * * balance washer screw 
failure on similar ADGs [air-driven generators]/ram air turbines 
installed on other aircraft types, investigation by Hamilton 
Sundstrand determined that a specific batch of the screws had a 
metallographic non-conformity that increased their susceptibility to 
brittle fracture. * * *
    Failure of a balance washer screw can result in loss of the 
related balance washer, with consequent turbine imbalance. Such 
imbalance could potentially result in ADG structural failure 
(including blade failure), loss of ADG electrical power and 
structural damage to the aircraft and, if deployment was activated 
by a dual engine shutdown, could also result in loss of hydraulic 
power for the flight controls [and consequent reduced ability of the 
flightcrew to maintain the safe flight and landing of the airplane].
* * * * *
    We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective November 1, 2010.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of November 1, 
2010.

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: Christopher Alfano, Aerospace 
Engineer, Airframe and Mechanical Systems Branch, ANE-171, FAA, New 
York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410, 
Westbury, New York 11590; telephone (516) 228-7340; 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 June 2, 2010 (75 FR 
30740). That NPRM proposed to correct an unsafe condition for the 
specified products. The MCAI states:

    Following five reported cases of * * * balance washer screw 
failure on similar ADGs [air-driven generators]/ram air turbines 
installed on other aircraft types, investigation by Hamilton 
Sundstrand determined that a specific batch of the screws had a 
metallographic non-conformity that increased their susceptibility to 
brittle fracture. Subsequently, it was established that 152 ``dry'' 
ADGs [Hamilton Sundstrand Part Numbers (P/Ns) in the 761339 series 
and 1711405; see Note] either had non-conforming screws installed 
during production or possibly during maintenance or repair at 
Hamilton Sundstrand repair stations.
    Failure of a balance washer screw can result in loss of the 
related balance washer, with consequent turbine imbalance. Such 
imbalance could potentially result in ADG structural failure 
(including blade failure), loss of ADG electrical power and 
structural damage to the aircraft and, if deployment was activated 
by a dual engine shutdown, could also result in loss of hydraulic 
power for the flight controls [and consequent reduced ability of the 
flightcrew to maintain the safe flight and landing of the airplane].
    This [Canadian] directive mandates checking of the ADG and 
replacing the balance washer screws, if required. It also prohibits 
future installation of unmodified ADGs.
    Note: ADGs with Hamilton Sundstrand P/Ns in the 761339 series 
and 1711405 are installed on the aircraft model listed in the 
Applicability section above in addition to Bombardier Inc. Models 
CL-600-2B19, CL-600-2C10 and CL-600-2D24. The latter three models 
are covered in a separate directive.

    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.

[[Page 59072]]

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 155 products of U.S. registry. 
We also estimate that it will take about 10 work-hours per product to 
comply with the basic requirements of this AD. The average labor rate 
is $85 per work-hour. Required parts will cost about $0 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 $131,750, or $850 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:

2010-20-03 Bombardier, Inc.: Amendment 39-16437. Docket No. FAA-
2010-0439; Directorate Identifier 2010-NM-029-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective November 
1, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier, Inc. Model CL-600-2B16 (CL-
604 Variant) airplanes; certificated in any category; serial numbers 
(S/N) 5408 and subsequent.

    Note 1: Some Model CL-600-2B16 (CL-604 Variant) airplanes might 
be referred to by a marketing designation of CL-605.

Subject

    (d) Air Transport Association (ATA) of America Code 24: 
Electrical power.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    Following five reported cases of * * * balance washer screw 
failure on similar ADGs [air-driven generators]/ram air turbines 
installed on other aircraft types, investigation by Hamilton 
Sundstrand determined that a specific batch of the screws had a 
metallographic non-conformity that increased their susceptibility to 
brittle fracture. Subsequently, it was established that 152 ``dry'' 
ADGs [Hamilton Sundstrand Part Numbers (P/Ns) in the 761339 series 
and 1711405; see Note] either had non-conforming screws installed 
during production or possibly during maintenance or repair at 
Hamilton Sundstrand repair stations.
    Failure of a balance washer screw can result in loss of the 
related balance washer, with consequent turbine imbalance. Such 
imbalance could potentially result in ADG structural failure 
(including blade failure), loss of ADG electrical power and 
structural damage to the aircraft and, if deployment was activated 
by a dual engine shutdown, could also result in loss of hydraulic 
power for the flight controls [and consequent reduced ability of the 
flightcrew to maintain the safe flight and landing of the airplane].
    This [Canadian] directive mandates checking of the ADG and 
replacing the balance washer screws, if required. It also prohibits 
future installation of unmodified ADGs.

    Note: ADGs with Hamilton Sundstrand P/Ns in the 761339 series 
and 1711405 are installed on the aircraft model listed in the 
Applicability section above in addition to Bombardier Inc. Models 
CL-600-2B19, CL-600-2C10 and CL-600-2D24. The latter three models 
are covered in a separate directive.

Compliance

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

Actions

    (g) At the earliest of the times identified in paragraphs 
(g)(1), (g)(2), (g)(3), and (g)(4) of this AD, do an inspection to 
determine the serial number of the installed ADG. A review of 
airplane maintenance records is acceptable in lieu of this 
inspection if the serial number of the ADG can be conclusively 
determined from that review.
    (1) Within 400 flight hours or 12 months after the effective 
date of this AD, whichever occurs first, or
    (2) Prior to the next in-flight or on-ground functional test of 
the ADG, whichever occurs first after the effective date of this AD, 
or
    (3) Prior to the next in-flight or on-ground operational test of 
the ADG, whichever occurs first after the effective date of this AD, 
or
    (4) Prior to the next scheduled ADG in-flight deployment.

[[Page 59073]]

    (h) If the ADG serial number, as determined in paragraph (g) of 
this AD, is not listed in paragraph 1.A of the applicable Bombardier 
service bulletin listed in Table 1 of this AD, no further action is 
required by this AD, except as required by paragraph (j) of this AD.

                       Table 1--Service Bulletins
------------------------------------------------------------------------
                                 Bombardier
           Model--                 Service              Dated--
                                 Bulletin--
------------------------------------------------------------------------
CL-600-2B16 (CL-604)               604-24-021  July 13, 2009.
 airplanes.
CL-600-2B16 (CL-605)               605-24-001  July 13, 2009.
 airplanes.
------------------------------------------------------------------------

     (i) If the ADG serial number determined in paragraph (g) of 
this AD is identified in paragraph 1.A. of the applicable service 
bulletin listed in Table 1 of this AD, before further flight, do an 
inspection to determine if the symbol ``24-5'' is marked on the ADG 
identification plate. A review of airplane maintenance records is 
acceptable in lieu of this inspection if the symbol ``24-5'' can be 
conclusively determined from that review.
    (1) If the symbol ``24-5'' is marked on the ADG identification 
plate, and the balance washer screws have already been replaced, no 
further action is required by this AD, except as required by 
paragraph (j) of this AD.
    (2) If the symbol ``24-5'' is not marked on the ADG 
identification plate, before further flight, replace all balance 
washer screws with new screws having part number MS24667-14 and mark 
the ADG identification plate with symbol ``24-5'', in accordance 
with the Accomplishment Instructions of the applicable service 
bulletin listed in Table 1 of this AD.
    (j) As of the effective date of this AD, no person may install 
on any airplane a replacement or spare ADG, Hamilton Sundstrand part 
number in the 761339 or 1711405 series, having one of the serial 
numbers identified in paragraph 1.A. of the applicable service 
bulletin listed in Table 1 of this AD, unless the ADG is identified 
with the symbol ``24-5'' on the identification plate.

FAA AD Differences

    Note 2:  This AD differs from the MCAI and/or service 
information as follows: The MCAI specifies to inspect only airplanes 
having certain serial numbers that are part of the MCAI 
applicability. Because the affected part could be rotated onto any 
of the airplanes listed in the applicability, this AD requires the 
inspection be done on all airplanes. We have coordinated this 
difference with TCCA.

Other FAA AD Provisions

    (k) The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York Aircraft Certification Office (ACO), ANE-170, 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: Program 
Manager, Continuing Operational Safety, FAA, New York ACO, 1600 
Stewart Avenue, Suite 410, Westbury, New York, 11590; telephone 516-
228-7300; fax 516-794-5531. Before using any approved AMOC on any 
airplane to which the AMOC applies, notify your principal 
maintenance inspector (PMI) or principal avionics inspector (PAI), 
as appropriate, or lacking a principal inspector, your local Flight 
Standards District Office. The AMOC approval letter must 
specifically reference this AD.
    (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 (44 
U.S.C. 3501 et seq.), the Office of Management and Budget (OMB) has 
approved the information collection requirements and has assigned 
OMB Control Number 2120-0056.

Related Information

    (l) Refer to MCAI Canadian Airworthiness Directive CF-2009-50, 
dated December 17, 2009; and Bombardier Service Bulletins 604-24-
021, dated July 13, 2009, and 605-24-001, dated July 13, 2009; for 
related information.

Material Incorporated by Reference

    (m) You must use Bombardier Service Bulletin 604-24-021, dated 
July 13, 2009; or Bombardier Service Bulletin 605-24-001, dated July 
13, 2009; as applicable; 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., 400 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-
7401; e-mail thd.crj@aero.bombardier.com; Internet http://
www.bombardier.com.
    (3) You may review copies of the service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, 
Washington. For information on the availability of this material at 
the FAA, call 425-227-1221.
    (4) You may also review copies of the service information that 
is incorporated by reference 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/code_of_federal_regulations/
ibr_locations.html.

    Issued in Renton, Washington, on September 10, 2010.
Jeffrey E. Duven,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-23742 Filed 9-24-10; 8:45 am]
BILLING CODE 4910-13-P

