
[Federal Register Volume 76, Number 63 (Friday, April 1, 2011)]
[Rules and Regulations]
[Pages 18024-18029]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2011-6630]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0436; Directorate Identifier 2009-NM-230-AD; 
Amendment 39-16643; AD 2011-07-06]
RIN 2120-AA64


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

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

ACTION: Final rule.

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

* * * There have recently been several in-service occurrences that 
have highlighted the inability of the existing [wing anti-ice] 
system to detect a low-heat condition in the wing leading edge at 
all times, with the potential consequence of unannunciated 
asymmetric ice build-up on the wing. * * *

[[Page 18025]]

Such a condition, in combination with maneuvers close to stick 
shaker activation, could possibly result in reduced controllability 
of the aircraft.
* * * * *
    We are issuing this AD to require actions to correct the unsafe 
condition on these products.

DATES: This AD becomes effective May 6, 2011.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of May 6, 2011.

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: Wing Chan, Aerospace Engineer, 
Avionics and Flight Test Branch, ANE-172, FAA, New York Aircraft 
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, 
New York 11590; telephone (516) 228-7311; 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 May 10, 2010 (75 FR 
25788). That NPRM proposed to correct an unsafe condition for the 
specified products. The MCAI states:

    At present, the Wing Anti-Ice System (WAIS) sufficient heat 
switches/sensors on CL-600-2B19 aircraft are located at the inboard 
end of each wing and require a simultaneous low-pressure signal to 
generate a L or R WING A/ICE amber caution. However, there have 
recently been several in-service occurrences that have highlighted 
the inability of the existing system to detect a low-heat condition 
in the wing leading edge at all times, with the potential 
consequence of unannunciated asymmetric ice build-up on the wing. 
These have included partial failure of several piccolo ducts [ref: 
Airworthiness Directive (AD) CF-2008-30] and partial (not fully 
closed or open) failure of a modulating and shut-off valve, the 
latter resulting in unannunciated asymmetric ice build-up on the 
wing leading edge. Such a condition, in combination with maneuvers 
close to stick shaker activation, could possibly result in reduced 
controllability of the aircraft.
    This directive mandates:
    (a) Revision of the Airplane Flight Manual (AFM) to notify the 
flight crew that, following installation and activation of the low-
heat detection switches, certain WAIS mode selection changes may 
result in a two-minute inhibition of the wing anti-ice message, if 
posted;
    (b) Revision of the approved maintenance schedule to include one 
revised and three new functional checks that are required following 
activation of the low-heat detection switches;
    (c) Replacement of the Data Concentrator Units (DCUs) with DCUs 
incorporating a software update that caters for the new outboard 
low-heat detection switches and generates the appropriate anti-ice 
message for the flight crew when a low-heat condition is detected;

    Note:  Although not related to this directive, the software 
update also corrects the sampling rate of two previously non-
compliant Flight Data Recorder (FDR) parameters, normal acceleration 
and pitch attitude.

    (d) Installation of the low-heat detection switches in the wing 
outboard leading edges, the wing A/ICE box assembly and associated 
wires; and
    (e) Activation of the low-heat detection switches.

    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 considered the comments received.

Support for the NPRM

    Air Line Pilots Association, International (ALPA) stated that it 
agrees that all reasonable steps should be taken to avoid reduced 
controllability while operating in icing conditions. ALPA stated that 
it supports the NPRM, but also encouraged the FAA to implement it as 
soon as possible to enable full compliance before winter.

Requests To Revise Costs of Compliance

    Limited Brands and Air Wisconsin requested that we revise the costs 
of compliance. Limited Brands disagreed with the estimate of 21 work-
hours and the cost of $1,785 per product to comply with the proposed 
AD. Limited Brands stated that the modification of the data 
concentrator unit (DCU), as required by paragraph (g)(3) of the NPRM, 
costs $1,200, the installation required by paragraph (g)(4) of the NPRM 
costs $3,300, and additional labor costs are $25,000, which brings the 
actual cost to $30,000 per airplane. Air Wisconsin stated it calculated 
that the costs are $600 for each of the two upgrades, $2,570 for other 
required parts, and 70 work-hours--for a total of $9,720 per airplane.
    We agree to revise the Costs of Compliance section of this AD. We 
have based our cost estimate on the service information and information 
from the manufacturer, and have calculated the costs for complying with 
the AD as follows: 2 work-hours for revising the Limitations section of 
the AFM and the ALI; 3 work-hours for replacing the DCU; 72 work-hours 
for installing the switches, assemblies, and wires; and 4 work-hours 
for activating the switches. We also calculated $4,500 for parts. We 
revised the Costs of Compliance section of this AD accordingly.

Request To Clarify the Modification to the Wing Leading Edges

    Air Wisconsin requested clarification regarding the modification of 
the wing leading edges. Air Wisconsin noted that the effectivity is 
against the airplane models but Bombardier Service Bulletin 601R-30-
031, Revision D, dated February 3, 2010, specifies modifying the 
leading edges, which was not addressed in the NPRM. Air Wisconsin noted 
that, if a non-modified spare leading edge is installed, there could be 
cause for confusion.
    We agree to provide clarification. The actions required by 
paragraph (g)(4) of this AD include modifying the leading edges.

Request To Revise the Compliance Time for Requirements of Paragraph 
(g)(2) of the NPRM for Task C30-10-141-01

    Mesa Airlines requested that we clarify the requirements of 
paragraph (g)(2) of the NPRM for Task C30-10-141-01. Mesa Airlines 
stated that on page 2A-11 of Appendix A of Part 2 of the Bombardier CL-
600-2B19 Maintenance Requirement Manual (MRM), Task C30-10-141-10 
provides the functional check of the wing anti-ice standby overheat 
switches and overheat/sufficient heat sensors and associated circuitry 
with an interval of 6,000 flight hours. Mesa Airlines stated that page 
1-2-35 of Section 2 of Part 1 of the Bombardier CL-600-2B19 Maintenance 
Review Board (MRB) Report, Task 30-12-12-01, ``Functional check of the 
wing anti-ice overheat sensors (duplicate Certification Maintenance 
Requirements (CMR) C30-10-141-01),'' provides a compliance time of 
4,000 flight hours. Mesa Airlines also stated that page 1-1-6 of 
Section 1 of Part 1 of the Bombardier CL-600-2B19 MRM states the 
following in Note 15: ``This task has a duplicate CMR requirement. 
Refer to Maintenance Requirements Manual, CSP-A-053, Part 2, Appendix 
A, for identification of specific requirements regarding handling of 
CMRs. Where the CMR interval for an MRB report task is more 
restrictive, the CMR interval takes precedence. When the interval for 
an MRB report task is more restrictive, the

[[Page 18026]]

MRB report task interval will take precedence.''
    Mesa Airlines asked that we clarify the NPRM as to which interval 
needs to be tracked--6,000 flight hours or 4,000 flight hours.
    We agree to clarify. The intent of the AD is to introduce the CMR 
tasks that are associated with the new switches. CMR Task C30-10-141-01 
was inadvertently mandated in Canadian AD CF-2009-37 and was carried 
over into the NPRM. The MRB group is currently looking into harmonizing 
these task intervals. Therefore, we have removed CMR Task C30-10-141-01 
from Table 1 of this final rule.

Request To Clarify Required Service Information

    Air Wisconsin requested that we clarify the name of the service 
information in paragraph (g)(2) of the NPRM. Air Wisconsin stated that 
paragraph (g)(2) of the NPRM refers to ``Airworthiness Limitations 
Instructions.'' Air Wisconsin asked if it should instead be 
``Bombardier CL-600-2B19 Maintenance Requirements Manual (MRM), 
Appendix A, Certification Maintenance Requirements (CMR).''
    We agree with the commenter's suggested service information 
citation. We have changed paragraph (g)(2) of this final rule 
accordingly.

Request To Revise Compliance Time in Table 1 of the NPRM

    Air Wisconsin requested that we revise the compliance time in Table 
1 of the NPRM. Air Wisconsin stated that under the column heading 
``Initial Compliance Time (whichever occurs later)'' for Tasks C30-10-
141-03, C30-10-141-05, and C30-10-141-07 in Table 1, the compliance 
time under that column heading should read ``Before the accumulation of 
6,000 flight hours, or if previously accomplished, within 6,000 flight 
hours since last accomplishment, whichever comes first.'' The commenter 
did not provide a reason for these suggestions.
    We agree with the commenter's suggested change. The intent of Table 
1 is to establish the initial compliance times for accomplishment of 
the specified tasks because only repetitive intervals are specified in 
Bombardier TR 2A-46, dated July 24, 2009. However, we acknowledge that 
some operators might have previously accomplished the initial tasks and 
could be doing those tasks repetitively. The commenter's suggested 
language would provide credit for earlier accomplishment of the tasks 
for those operators. We have revised Table 1 to include the language 
suggested by the commenter.

Request To Remove Note 3 of the NPRM

    Air Wisconsin requested to remove Note 3 from the NPRM. Air 
Wisconsin stated that the inspection requirements in Bombardier 
Temporary Revision (TR) 2A-46, dated July 24, 2009, are already 
contained in the general revision of the MRM, specifically, Revision 9, 
dated December 10, 2009. Air Wisconsin stated that this updated general 
revision makes Note 3 irrelevant and, therefore, the note should be 
removed.
    We disagree. The note is necessary to keep operators in compliance 
when the TR is incorporated into general revisions. Operators that have 
a revision of the MRM that contains the information in Bombardier TR 
2A-46 are in compliance. We have not changed the final rule in regard 
to this issue.

Request To Remove Note 4 of the NPRM

    Air Wisconsin requested we remove Note 4 from the NPRM. Air 
Wisconsin stated this note is not pertinent to the content of the NPRM 
because Task 30-11-41-820-801 is not part of Bombardier Service 
Bulletin 601R-30-031, Revision D, dated February 3, 2010, and should be 
removed.
    We disagree. Task 30-11-41-820-801 is pertinent to this AD because 
it is part of the Bombardier CRJ Series Regional Jet Aircraft 
Maintenance Manual, and it provides guidance to correct alignment of 
the piccolo ducts since a small number of cases have been reported in 
which they were found to have been installed in the opposing wing, 
resulting in the incorrect orientation of the bleed holes. One of the 
requirements of this AD is to install the low-heat direction switches 
in the wing outboard leading edges. This task requires particular 
attention to the correct alignment of the piccolo ducts after the 
installation of the low-heat detection switches. We have not changed 
the final rule in regard to this issue.

Request To Revise Compliance Time for Requirements of Paragraph (g)(5) 
of the NPRM

    Air Wisconsin, Mesaba Airlines, and Mesa Airlines requested that we 
revise the compliance time for activating the outboard low-heat 
detection switches, as proposed by paragraph (g)(5) of the NPRM. Air 
Wisconsin requested that incorporating the procedures specified in Part 
F of the Accomplishment Instructions of Bombardier Service Bulletin 
601R-30-031, Revision D, dated February 3, 2010, should be performed at 
the next heavy maintenance visit, provided that parts (kits) are 
available. Air Wisconsin stated that it has scheduled these tasks to be 
completed by the end of December 2011. Mesaba Airlines requested that 
the compliance time in paragraph (g) of the NPRM be revised from 11 
months to 5,000 flight hours after the effective date of this AD. 
Mesaba Airlines stated that the 11-month compliance time for the 
modification will result in extended downtime and cause interruptions. 
Mesa Airlines stated that it agrees with Mesaba Airlines' request to 
change the compliance time from months to hours.
    We disagree. In developing the compliance time for this AD action, 
we considered not only the safety implications of the identified unsafe 
condition, but the average utilization rate of the affected fleet, the 
practical aspects of an orderly modification of the fleet during 
regular maintenance periods, the availability of required parts, and 
the time necessary for the rulemaking process. The proposed compliance 
time, which is based on the effective date of the final rule, was 
determined to be appropriate. However, under the provisions of 
paragraph (h) of the final rule, we will consider requests for approval 
of an extension of the compliance time if sufficient data are submitted 
to substantiate that the change would provide an acceptable level of 
safety. We have not changed the final rule in regard to this issue.

Clarification of Changes to This AD

    We have revised paragraph (e) of this AD by removing some text and 
retaining only the text that applies to the Reason section of this AD.
    In addition, we have removed paragraph (h)(3) of the NPRM because 
this AD does not contain a reporting requirement.

Conclusion

    We reviewed the available data, including the comments received, 
and determined that air safety and the public interest require adopting 
the AD with the changes described previously. We determined that these 
changes will not increase the economic burden on any operator or 
increase the scope of the AD.

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

[[Page 18027]]

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 affects 599 products of U.S. registry. We 
also estimate that it takes about 81 work-hours per product to comply 
with the basic requirements of this AD. The average labor rate is $85 
per work-hour. Parts cost $4,500 per product. Based on these figures, 
we estimate the cost of this AD to the U.S. operators to be $6,819,615, 
or $11,385 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

    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:

2011-07-06 Bombardier, Inc.: Amendment 39-16643. Docket No. FAA-
2010-0436; Directorate Identifier 2009-NM-230-AD.

Effective Date

    (a) This airworthiness directive (AD) becomes effective May 6, 
2011.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Bombardier, Inc. Model CL-600-2B19 
(Regional Jet Series 100 & 440) airplanes, certificated in any 
category, serial numbers 7003 through 8101 inclusive.

    Note 1:  This AD requires revisions to certain operator 
maintenance documents to include new inspections. Compliance with 
these inspections is required by 14 CFR 91.403(c). For airplanes 
that have been previously modified, altered, or repaired in the 
areas addressed by these inspections, the operator may not be able 
to accomplish the inspections described in the revisions. In this 
situation, to comply with 14 CFR 91.403(c), the operator must 
request approval for an alternative method of compliance according 
to paragraph (h)(1) of this AD. The request should include a 
description of changes to the required inspections that will ensure 
the continued operational safety of the airplane.

Subject

    (d) Air Transport Association (ATA) of America Code 30 and 31: 
Ice and rain protection, and instruments, respectively.

Reason

    (e) The mandatory continuing airworthiness information (MCAI) 
states:

* * * There have recently been several in-service occurrences that 
have highlighted the inability of the existing [wing anti-ice] 
system to detect a low-heat condition in the wing leading edge at 
all times, with the potential consequence of unannunciated 
asymmetric ice build-up on the wing. * * * Such a condition, in 
combination with maneuvers close to stick shaker activation, could 
possibly result in reduced controllability of the aircraft.
* * * * *

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) Do the following actions.
    (1) Within 30 days after the effective date of this AD, revise 
the Limitations and Normal Procedures sections of the Canadair 
Regional Jet Airplane Flight Manual (AFM), CSP A-012, to include the 
information in Canadair (Bombardier) Temporary Revision (TR) RJ/164-
2, dated May 14, 2009. This TR introduces procedures for operation 
in icing conditions. Operate the airplane according to the 
limitations and procedures in this TR.

    Note 2: This may be done by inserting a copy of Canadair 
(Bombardier) TR RJ/164-2, dated May 14, 2009, into the AFM. When 
this TR has been included in general revisions of the AFM, the 
general revisions may be inserted in the AFM, provided the relevant 
information in the general revision is identical to that in Canadair 
(Bombardier) TR RJ/164-2, dated May 14, 2009.

    (2) Within 30 days after the effective date of this AD, revise 
the maintenance program by incorporating the inspection requirements 
for Tasks C30-10-141-03, C30-10-141-05, and C30-10-141-07, contained 
in Bombardier TR 2A-46, dated July 24, 2009, into Appendix A, 
``Certification Maintenance Requirements,'' of Part 2 of the 
Bombardier CL-600-2B19 Maintenance Requirements Manual (MRM). The 
initial compliance times for the tasks identified in Bombardier TR 
2A-46, dated July 24, 2009, are specified in Table 1 of this AD.

    Note 3:  The actions required by paragraph (g)(2) of this AD may 
be done by inserting a copy of Bombardier TR 2A-46, dated July 24, 
2009, into the Bombardier CL-600-2B19 MRM. When this TR has been 
included in general revisions of the MRM, the general revisions may 
be inserted into the MRM, provided the relevant information in the 
general revision is identical to that in Bombardier TR 2A-46, dated 
July 24, 2009.


[[Page 18028]]



                       Table 1--Initial Compliance Times for Tasks in Bombardier TR 2A-46
----------------------------------------------------------------------------------------------------------------
 
----------------------------------------------------------------------------------------------------------------
             Task                      Applicability          Initial compliance time (whichever occurs later)
----------------------------------------------------------------------------------------------------------------
C30-10-141-03.................  Airplanes on which          Before the accumulation    Within 5 flight hours or
                                 Modification Summary        of 6,000 total flight      30 days after the
                                 TC601R17494 or actions      hours; or if               effective date of this
                                 specified in Bombardier     accomplished previously,   AD, whichever occurs
                                 Service Bulletin 601R-30-   within 6,000 flight        later.
                                 031 have been done.         hours since this task
                                                             was last accomplished.
C30-10-141-05.................  Airplanes with outboard     Before the accumulation    Within 5 flight hours or
                                 sufficient heat switches    of 6,000 total flight      30 days after the
                                 installed in accordance     hours; or if               effective date of this
                                 with Modification Summary   accomplished previously,   AD, whichever occurs
                                 TC601R17494 or actions      within 6,000 flight        later.
                                 specified in Bombardier     hours since this task
                                 Service Bulletin 601R-30-   was last accomplished.
                                 031 have been done.
C30-10-141-07.................  Airplanes with outboard     Before the accumulation    Within 5 flight hours or
                                 sufficient heat switches    of 6,000 total flight      30 days after the
                                 installed in accordance     hours; or if               effective date of this
                                 with Modification Summary   accomplished previously,   AD, whichever occurs
                                 TC601R17494 or actions      within 6,000 flight        later.
                                 specified in Bombardier     hours since this task
                                 Service Bulletin 601R-30-   was last accomplished.
                                 031 have been done.
----------------------------------------------------------------------------------------------------------------

     (3) For airplanes having S/Ns 7003 through 8095 inclusive: 
Before or concurrently with accomplishing the actions required by 
paragraph (g)(5) of this AD: Replace any data concentrator units 
(DCUs) having part number (P/N) 622-9820-007, 622-9820-008, or 622-
9820-009 with modified DCUs having P/N 622-9820-010, and, if 
applicable, modify the configuration strapping units (CSUs), in 
accordance with the Accomplishment Instructions of Bombardier 
Service Bulletin 601R-31-034, Revision A, dated April 10, 2008.
    (4) Before or concurrently with accomplishing the actions 
required by paragraph (g)(5) of this AD: Install the outboard low-
heat detection switches, and wing A/ICE box assembly and its 
associated wires, in accordance with the Accomplishment Instructions 
of Parts A, C, D, and E of Bombardier Service Bulletin 601R-30-031, 
Revision D, dated February 3, 2010.

    Note 4:  A small number of cases have been reported in which 
piccolo ducts were found to have been installed in the opposite 
wing, resulting in the incorrect orientation of the bleed holes. 
During reinstallation of the piccolo ducts and leading edge 
assemblies after installing the low-heat detection switches, 
particular attention should be paid to the correct alignment of the 
piccolo ducts. Guidance can be found in Task 30-11-41-820-801 of the 
Canadair CRJ Series Regional Jet Aircraft Maintenance Manual.

    (5) Within 11 months after the effective date of this AD: 
Activate the outboard low-heat detection switches in accordance with 
Part F of the Accomplishment Instructions of Bombardier Service 
Bulletin 601R-30-031, Revision D, dated February 3, 2010.
    (6) Actions accomplished in accordance with the service 
information specified in Table 2 of this AD, before the effective 
date of this AD, are acceptable for compliance with the 
corresponding actions required by paragraphs (g)(4) and (g)(5) of 
this AD.

                                     Table 2--Acceptable Service Information
----------------------------------------------------------------------------------------------------------------
      Bombardier Service Bulletin--                Revision--                           Dated--
----------------------------------------------------------------------------------------------------------------
601R-30-031.............................  Original...................  May 15, 2009.
601R-30-031.............................  A..........................  September 8, 2009.
601R-30-031.............................  B..........................  October 28, 2009.
601R-30-031.............................  C..........................  December 23, 2009.
----------------------------------------------------------------------------------------------------------------

     (7) Replacing DCUs P/N 622-9820-007, 622-9820-008, or 622-9820-
009 with modified DCUs having P/N 622-9820-010, and modifying CSUs, 
are also acceptable for compliance with the requirements of 
paragraph (g)(3) of this AD if done before the effective date of 
this AD, in accordance with Accomplishment Instructions of 
Bombardier Service Bulletin 601R-30-034, dated November 19, 2007.

FAA AD Differences

    Note 5:  This AD differs from the MCAI and/or service 
information as follows: The MCAI specifies to include the revised 
Task C30-10-141-01. This AD does not include Task 30-10-141-01. This 
difference has been coordinated with TCCA.

Other FAA AD Provisions

    (h) 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. In accordance with 14 CFR 39.19, 
send your request to your principal inspector or local Flight 
Standards District Office, as appropriate. If sending information 
directly to the ACO, send it 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, notify your appropriate 
principal inspector, or lacking a principal inspector, the manager 
of the local flight standards district office/certificate holding 
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.

Related Information

    (i) Refer to MCAI Transport Canada Civil Aviation (TCCA) 
Airworthiness Directive CF-2009-37, dated September 30, 2009; and 
the service information specified in Table 3 of this AD; for related 
information.

[[Page 18029]]



                                          Table 3--Service Information
----------------------------------------------------------------------------------------------------------------
                Service information                           Revision                        Date
----------------------------------------------------------------------------------------------------------------
Bombardier Service Bulletin 601R-30-031............  D........................  February 3, 2010.
Bombardier Service Bulletin 601R-31-034............  A........................  April 10, 2008.
Bombardier Temporary Revision 2A-46 to Appendix A--  Original.................  July 24, 2009.
 Certification Maintenance Requirements of Part 2
 of the Bombardier CL[dash]600-2B19 Maintenance
 Requirements Manual.
Canadair (Bombardier) Temporary Revision RJ/164-2    Original.................  May 14, 2009.
 to the Canadair Regional Jet Airplane Flight
 Manual CSP A-012.
----------------------------------------------------------------------------------------------------------------

Material Incorporated by Reference

    (j) You must use the service information contained in Table 4 of 
this AD, 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.

                                   Table 4--Material Incorporated by Reference
----------------------------------------------------------------------------------------------------------------
                Service information                           Revision                        Date
----------------------------------------------------------------------------------------------------------------
Bombardier Service Bulletin 601R-30-031............  D........................  February 3, 2010.
Bombardier Service Bulletin 601R-31-034............  A........................  April 10, 2008.
Bombardier Temporary Revision 2A-46 to Appendix A--  Original.................  July 24, 2009.
 Certification Maintenance Requirements of Part 2
 of the Bombardier CL-600-2B19 Maintenance
 Requirements Manual.
Canadair (Bombardier) Temporary Revision RJ/164-2    Original.................  May 14, 2009.
 to the Canadair Regional Jet Airplane Flight
 Manual CSP A-012.
----------------------------------------------------------------------------------------------------------------


    Issued in Renton, Washington, on March 14, 2011.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2011-6630 Filed 3-31-11; 8:45 am]
BILLING CODE 4910-13-P


