
[Federal Register: May 21, 2010 (Volume 75, Number 98)]
[Rules and Regulations]               
[Page 28471-28475]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr21my10-4]                         

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0169; Directorate Identifier 2009-NM-102-AD; 
Amendment 39-16305; AD 2010-10-26]
RIN 2120-AA64

 
Airworthiness Directives; Bombardier, Inc. Model CL-600-1A11 (CL-
600), CL-600-2A12 (CL-601), and CL-600-2B16 (CL-601-3A, CL-601-3R, and 
CL-604 Variants) Airplanes

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

ACTION: Final rule.

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SUMMARY: We are superseding an existing 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:


[[Page 28472]]


    A specific batch of nose landing gear (NLG) and NLG door 
selector valves, part number (P/N) 601R75146-1 (Kaiser Fluid 
Technologies P/N 750006000), may have had their end caps incorrectly 
lock-wired and/or incorrectly torqued during assembly. This 
condition can lead to the end cap backing off, with consequent 
damage to a seal and internal leakage within the valve. 
Subsequently, if electrical power is transferred or removed from the 
aircraft before the NLG safety pin is installed, any pressure, 
including residual pressure, in the No. 3 hydraulic system can 
result in an uncommanded NLG retraction.
* * * * *
We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective June 25, 2010.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of June 25, 
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: Cesar Gomez, 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) 228-7318; 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 February 25, 2010 
(75 FR 8559), and proposed to supersede AD 2007-14-02, Amendment 39-
15124 (72 FR 38004, July 12, 2007).
    That NPRM proposed to correct an unsafe condition for the specified 
products. The MCAI states:

    A specific batch of nose landing gear (NLG) and NLG door 
selector valves, part number (P/N) 601R75146-1 (Kaiser Fluid 
Technologies P/N 750006000), may have had their end caps incorrectly 
lock-wired and/or incorrectly torqued during assembly. This 
condition can lead to the end cap backing off, with consequent 
damage to a seal and internal leakage within the valve. 
Subsequently, if electrical power is transferred or removed from the 
aircraft before the NLG safety pin is installed, any pressure, 
including residual pressure, in the No. 3 hydraulic system can 
result in an uncommanded NLG retraction.
    Although there have been no such cases reported on the 
Challenger models covered by this directive, there have been six 
cases reported on the CRJ (CL600-2B19) aircraft, one of which 
resulted in the collapse of the NLG at the departure gate.
    This directive mandates a check of the NLG and NLG door selector 
valves installed on all aircraft in the Applicability section * * *. 
Depending on the results; replacement, rework and/or additional 
identification of the valves may be required.
    This [MCAI] revision corrects a Service Bulletin number in the 
Corrective Actions table.

    Notes: 1. The check is required whether or not an aircraft has 
previously been checked in accordance with AD CF-2006-16R1 (now 
superseded and cancelled by this AD). This is necessary since, 
following the issuance of AD CF-2006-16R1, it has been determined 
that the serial number (S/N) range of the affected valves requires 
expansion from the previous upper limit of S/N 0767 to S/N 2126 and 
the exact location of each of these additional valves is unknown.
    2. Valves that have a S/N with suffix ``T'' have been 
manufactured by Tactair Fluid Controls Inc. and do not require any 
corrective action.
    3. Valves manufactured by Kaiser Fluid Technologies, P/N 
750006000, with S/N 0001 through 2126, and ink stamp ``SB750006000-
1'', have already been checked and reworked as necessary and do not 
require any additional corrective action.
    4. The Illustrated Parts Catalog, for each of the models covered 
in the Applicability section * * *, gives instructions not to 
install a valve manufactured by Kaiser Fluid Technologies, P/N 
750006000, with S/N 0001 through 2126, if the marking ``SB750006000-
1'' is not ink stamped on the valve.
    5. CL-600-2B16 (CL-605) aircraft, S/Ns 5701 and subsequent, are 
not affected by this directive. They were delivered with valves, P/N 
750006000, that have either a S/N with suffix ``T'' or have the ink 
stamp marking ``SB750006000-1''.


We have clarified the applicability of this AD by removing serial 
numbers 5666 through 5699 that were included in AD 2007-14-02. Those 
serial numbers do not exist for the affected airplane models in this 
AD. 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 82 products of U.S. 
registry.
    The actions that are required by AD 2007-14-02 and retained in this 
AD take about 1 work-hour per product, at an average labor rate of $85 
per work hour. Based on these figures, the estimated cost of the 
currently required actions is $85 per product.
    We estimate that it will take about 1 work-hour per product to 
comply with the new basic requirements of this AD. The average labor 
rate is $85 per work-hour. Based on these figures, we estimate the cost 
of the new basic requirements of this AD to U.S. operators to be 
$6,970, or $85 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

[[Page 28473]]

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 removing Amendment 39-15124 (72 FR 
38004, July 12, 2007) and adding the following new AD:

2010-10-26 Bombardier, Inc.: Amendment 39-16305. Docket No. FAA-
2010-0169; Directorate Identifier 2009-NM-102-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective June 25, 
2010.

Affected ADs

    (b) This AD supersedes AD 2007-14-02, Amendment 39-15124.

Applicability

    (c) This AD applies to Bombardier, Inc. airplanes, certificated 
in any category, identified in paragraphs (c)(1), (c)(2), and (c)(3) 
of this AD.
    (1) Model CL-600-1A11 (CL-600), serial numbers 1004 through 1085 
inclusive.
    (2) Model CL-600-2A12 (CL-601), serial numbers 3001 through 3066 
inclusive.
    (3) Model CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604), serial 
numbers 5001 through 5194 inclusive, and serial numbers 5301 through 
5665 inclusive.

Subject

    (d) Air Transport Association (ATA) of America Code 32: Landing 
Gear.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:
    A specific batch of nose landing gear (NLG) and NLG door 
selector valves, part number (P/N) 601R75146-1 (Kaiser Fluid 
Technologies P/N 750006000), may have had their end caps incorrectly 
lock-wired and/or incorrectly torqued during assembly. This 
condition can lead to the end cap backing off, with consequent 
damage to a seal and internal leakage within the valve. 
Subsequently, if electrical power is transferred or removed from the 
aircraft before the NLG safety pin is installed, any pressure, 
including residual pressure, in the No. 3 hydraulic system can 
result in an uncommanded NLG retraction.
    Although there have been no such cases reported on the 
Challenger models covered by this directive, there have been six 
cases reported on the CRJ (CL600-2B19) aircraft, one of which 
resulted in the collapse of the NLG at the departure gate.
    This directive mandates a check of the NLG and NLG door selector 
valves installed on all aircraft in the Applicability section * * *. 
Depending on the results; replacement, rework and/or additional 
identification of the valves may be required.
    This [MCAI] revision corrects a Service Bulletin number in the 
Corrective Actions table.

    Notes: 1. The check is required whether or not an aircraft has 
previously been checked in accordance with AD CF-2006-16R1 (now 
superseded and cancelled by this AD). This is necessary since, 
following the issuance of AD CF-2006-16R1, it has been determined 
that the serial number (S/N) range of the affected valves requires 
expansion from the previous upper limit of S/N 0767 to S/N 2126 and 
the exact location of each of these additional valves is unknown.
    2. Valves that have a S/N with suffix ``T'' have been 
manufactured by Tactair Fluid Controls Inc. and do not require any 
corrective action.
    3. Valves manufactured by Kaiser Fluid Technologies, P/N 
750006000, with S/N 0001 through 2126, and ink stamp ``SB750006000-
1'', have already been checked and reworked as necessary and do not 
require any additional corrective action.
    4. The Illustrated Parts Catalog, for each of the models covered 
in the Applicability section * * *, gives instructions not to 
install a valve manufactured by Kaiser Fluid Technologies, P/N 
750006000, with S/N 0001 through 2126, if the marking ``SB750006000-
1'' is not ink stamped on the valve.
    5. CL-600-2B16 (CL-605) aircraft, S/Ns 5701 and subsequent, are 
not affected by this directive. They were delivered with valves, P/N 
750006000, that have either a S/N with suffix ``T'' or have the ink 
stamp marking ``SB750006000-1''.

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.

RESTATEMENT OF REQUIREMENTS OF AD 2007-14-02 WITH NEW SERVICE 
INFORMATION BUT NO CHANGES TO ACTIONS:

Inspection and Corrective Action

    (g) For airplanes having serial numbers (S/Ns) as identified in 
the service bulletins specified in Table 1 of this AD, as 
applicable: Within 500 flight hours or 12 months after August 16, 
2007 (the effective date AD 2007-14-02), whichever occurs first, 
inspect to determine the manufacturer part numbers (P/Ns) and serial 
numbers of the selector valves of the nose landing gear (NLG) and 
nose gear door. A review of airplane maintenance records is 
acceptable in lieu of this inspection if the serial numbers of the 
selector valves can be conclusively determined from that review. For 
any subject selector valve having Tactair Fluid Controls P/N 
750006000 and a S/N from 0001 through 0767 inclusive, before further 
flight, do related investigative (including a general visual 
inspection for proper installation of the lock wire of the end cap) 
and corrective actions; in accordance with the applicable service 
bulletin identified in Table 1 of this AD. After the effective date 
of this AD, use only the applicable service bulletin specified in 
Table 2 of this AD.

                                      Table 1--Bombardier Service Bulletins
----------------------------------------------------------------------------------------------------------------
                                            Bombardier
                 Model--                      service       Revision--                    Dated--
                                            bulletin--
----------------------------------------------------------------------------------------------------------------
CL-600-1A11 (CL-600) airplanes..........        600-0721              01  February 20, 2006.
CL-600-2A12 (CL-601), and CL-600-2B16           601-0558              01  February 20, 2006.
 (CL-601-3A and CL-601-3R) airplanes.

[[Page 28474]]


CL-600-2B16 (CL-604) airplanes).........      604-32-021              02  February 20, 2007.
----------------------------------------------------------------------------------------------------------------


                  Table 2--Bombardier Service Bulletins for Actions in Paragraph (g) of this AD
----------------------------------------------------------------------------------------------------------------
                                            Bombardier
                 Model--                      service       Revision--                    Dated--
                                            bulletin--
----------------------------------------------------------------------------------------------------------------
CL-600-1A11 (CL-600) airplanes..........        600-0721              03  February 23, 2009.
CL-600-2A12 (CL-601), and CL-600-2B16           601-0558              03  February 23, 2009.
 (CL-601-3A and CL-601-3R) airplanes.
CL-600-2B16 (CL-604) airplanes..........      604-32-021              04  February 23, 2009.
----------------------------------------------------------------------------------------------------------------


    Note 1: Operators should be aware that selector valves having 
Bombardier P/N 601R75146-1 may be supplied by different 
manufacturers and have different manufacturer part numbers. Only 
airplanes having selector valves manufactured by Tactair Fluid 
Controls, having P/N 750006000, are subject to the investigative and 
corrective actions specified in paragraph (g) of this AD.


    Note 2: For the purposes of this AD, a general visual inspection 
is: ``A visual examination of an interior or exterior area, 
installation, or assembly to detect obvious damage, failure, or 
irregularity. This level of inspection is made from within touching 
distance unless otherwise specified. A mirror may be necessary to 
ensure visual access to all surfaces in the inspection area. This 
level of inspection is made under normally available lighting 
conditions such as daylight, hangar lighting, flashlight, or 
droplight and may require removal or opening of access panels or 
doors. Stands, ladders, or platforms may be required to gain 
proximity to the area being checked.''


    Note 3: The service bulletins identified in Table 1 of this AD 
refer to Tactair Fluid Controls Service Bulletin SB750006000-1, 
Revision A, dated September 6, 2005, as an additional source of 
guidance for doing the related investigative and corrective actions 
required by this AD.

Actions Accomplished According to Previous Issue of Service Bulletin

    (h) Actions accomplished before August 16, 2007, in accordance 
with Bombardier Service Bulletin 604-32-021, Revision 01, dated 
February 20, 2006 (for Model CL-600-2B16 (CL-604) airplanes), are 
considered acceptable for compliance with the corresponding actions 
specified in paragraph (g) of this AD.

NEW REQUIREMENTS OF THIS AD:

Actions

    (i) Unless already done, do the following actions.
    (1) Within 250 flight hours or within 6 months after the 
effective date of this AD, whichever occurs first: Do an inspection 
of the selector valve of the NLG and the door selector valve of the 
NLG to determine if P/N 601R75146-1 (Kaiser Fluid Technologies P/N 
750006000) is installed, in accordance with the Accomplishment 
Instructions of the applicable service bulletin specified in Table 3 
of this AD. Doing the inspection required by this paragraph 
terminates the inspection required by paragraph (g) of this AD.

                  Table 3--Bombardier Service Bulletins for Actions in Paragraph (i) of This AD
----------------------------------------------------------------------------------------------------------------
                                            Bombardier
                 Model--                      service       Revision--                    Dated--
                                            bulletin--
----------------------------------------------------------------------------------------------------------------
CL-600-1A11 (CL-600) airplanes..........        600-0721              03  February 23, 2009.
CL-600-2A12 (CL-601), and CL-600-2B16           601-0558              03  February 23, 2009.
 (CL-601-3A and CL-601-3R) airplanes.
CL-600-2B16 (CL-604) airplanes..........      604-32-021              04  February 23, 2009.
----------------------------------------------------------------------------------------------------------------

    (2) If, during any inspection required by paragraph (i)(1) of 
this AD, any selector valve having P/N 601R75146-1 (Kaiser Fluid 
Technologies P/N 750006000) and having a S/N from 0001 through 2126 
inclusive without a suffix ``T'' is found, and the valve is not ink-
stamped with the marking ``SB750006000-1'': Before further flight, 
do a general visual inspection for proper installation of the lock 
wire of the end cap, and replace it with a serviceable selector 
valve as applicable, in accordance with the Accomplishment 
Instructions of the applicable service bulletin specified in Table 3 
of this AD.
    (3) Doing the actions before the effective date of this AD in 
accordance with the applicable service bulletin specified in Table 4 
of this AD is acceptable for compliance with the corresponding 
actions specified in this AD.

                    Table 4--Credit Service Bulletins
------------------------------------------------------------------------
      Service bulletin        Revision level             Date
------------------------------------------------------------------------
Bombardier Service Bulletin               02  June 16, 2008.
 600-0721.
Bombardier Service Bulletin               02  June 16, 2008.
 601-0558.
Bombardier Service Bulletin               03  June 16, 2008.
 604-32-021.
------------------------------------------------------------------------


[[Page 28475]]

FAA AD Differences

    Note 4: This AD differs from the MCAI and/or service information 
as follows: No differences.

Other FAA AD Provisions

    (j) 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

    (k) Refer to MCAI Canadian Airworthiness Directive CF-2009-21R1, 
dated May 20, 2009; Bombardier Service Bulletin 600-0721, Revision 
03, dated February 23, 2009; Bombardier Service Bulletin 601-0558, 
Revision 03, dated February 23, 2009; and Bombardier Service 
Bulletin 604-32-021, Revision 04, dated February 23, 2009; for 
related information.

Material Incorporated by Reference

    (l) You must use the service information contained in Table 5 of 
this AD to do the actions required by this AD, unless the AD 
specifies otherwise.

               Table 5--Material Incorporated by Reference
------------------------------------------------------------------------
          Document               Revision                Date
------------------------------------------------------------------------
Bombardier Service Bulletin               03  February 23, 2009.
 600-0721.
Bombardier Service Bulletin               03  February 23, 2009.
 601-0558.
Bombardier Service Bulletin               04  February 23, 2009.
 604-32-021.
------------------------------------------------------------------------

    (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 May 6, 2010.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-11743 Filed 5-20-10; 8:45 am]
BILLING CODE 4910-13-P

