Airworthiness Directives; Bombardier, Inc. Model CL-600-2B16 (CL-604 Variants (Including CL-605 Marketing Variant)) Airplanes, 59071-59073 [2010-23742]

Download as PDF Federal Register / Vol. 75, No. 186 / Monday, September 27, 2010 / Rules and Regulations Burlington, MA; 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 (860) 565–5515; fax: (860) 565–5510, for a copy of this service information. You may review copies at the FAA, New England Region, 12 New England Executive Park, 59071 to: https://www.archives.gov/federal-register/ cfr/ibr-locations.html. TABLE 1—INCORPORATION BY REFERENCE International Aero Engines Service Bulletin No. Page V2500–ENG–72–0594 ...................................................................................................................... Total Pages: 61. V2500–ENG–72–0601 ...................................................................................................................... Total Pages: 9. V2500–ENG–72–0603 ...................................................................................................................... Total pages: 46. ALL ...... 6 April 12, 2010. ALL ...... 2 April 12, 2010. ALL ...... 2 March 17, 2010. 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]. Issued in Burlington, Massachusetts, on September 15, 2010. Robert J. Ganley, Acting Manager, Engine and Propeller Directorate, Aircraft Certification Service. [FR Doc. 2010–23832 Filed 9–24–10; 8:45 am] * BILLING CODE 4910–13–P 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 Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule. AGENCY: 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: mstockstill on DSKH9S0YB1PROD with RULES SUMMARY: 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 VerDate Mar<15>2010 16:28 Sep 24, 2010 Jkt 220001 * * * * 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 https:// 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 PO 00000 Frm 00015 Fmt 4700 Sfmt 4700 Revision Date that 152 ‘‘dry’’ ADGs [Hamilton Sundstrand Part Numbers (P/Ns) in the 761339 series and 1711405; see Note] either had nonconforming 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. E:\FR\FM\27SER1.SGM 27SER1 59072 Federal Register / Vol. 75, No. 186 / Monday, September 27, 2010 / Rules and Regulations 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 workhours 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. mstockstill on DSKH9S0YB1PROD with RULES 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: VerDate Mar<15>2010 17:41 Sep 24, 2010 Jkt 220001 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 https:// 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 Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows: ■ PART 39—AIRWORTHINESS DIRECTIVES 1. The authority citation for part 39 continues to read as follows: ■ Authority: 49 U.S.C. 106(g), 40113, 44701. § 39.13 [Amended] 2. The FAA amends § 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. PO 00000 Frm 00016 Fmt 4700 Sfmt 4700 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 nonconforming 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 inflight deployment. E:\FR\FM\27SER1.SGM 27SER1 Federal Register / Vol. 75, No. 186 / Monday, September 27, 2010 / Rules and Regulations (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 59073 this AD, except as required by paragraph (j) of this AD. TABLE 1—SERVICE BULLETINS Bombardier Service Bulletin— Model— CL–600–2B16 (CL–604) airplanes .................................................................................................................. CL–600–2B16 (CL–605) 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 mstockstill on DSKH9S0YB1PROD with RULES 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, VerDate Mar<15>2010 16:28 Sep 24, 2010 Jkt 220001 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 ˆ this AD, contact Bombardier, Inc., 400 Cote´ Vertu Road West, Dorval, Quebec H4S 1Y9, Canada; telephone 514–855–5000; fax 514– 855–7401; e-mail thd.crj@aero.bombardier.com; Internet https:// 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 PO 00000 Frm 00017 Fmt 4700 Sfmt 4700 604–24–021 605–24–001 Dated— July 13, 2009. July 13, 2009. to: https://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 DEPARTMENT OF TRANSPORTATION Federal Aviation Administration 14 CFR Part 39 [Docket No. FAA–2010–0375; Directorate Identifier 2010–NM–014–AD; Amendment 39–16443; AD 2010–20–09] RIN 2120–AA64 Airworthiness Directives; Bombardier, Inc. Model CL–600–2B19 (Regional Jet Series 100 & 440) Airplanes; Model CL–600–2C10 (Regional Jet Series 700, 701, & 702) Airplanes; Model CL–600– 2D15 (Regional Jet Series 705) and Model CL–600–2D24 (Regional Jet Series 900) Airplanes Federal Aviation Administration (FAA), Department of Transportation (DOT). ACTION: Final rule. AGENCY: 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: SUMMARY: Following five reported cases of balance washer screw failure on similar ADGs [airdriven 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, E:\FR\FM\27SER1.SGM 27SER1

Agencies

[Federal Register Volume 75, Number 186 (Monday, September 27, 2010)]
[Rules and Regulations]
[Pages 59071-59073]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2010-23742]

-----------------------------------------------------------------------

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.

-----------------------------------------------------------------------

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:

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 https://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 https://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 https://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: https://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

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