Document ID: FAA-2018-0801-0005
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: Bombardier, Inc., Airplanes
Posted Date: 2019-06-06T04:00Z

[Federal Register Volume 84, Number 109 (Thursday, June 6, 2019)]
[Rules and Regulations]
[Pages 26334-26341]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-11830]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0801; Product Identifier 2017-NM-147-AD; Amendment 
39-19632; AD 2019-08-11]
RIN 2120-AA640

Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

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SUMMARY: We are superseding Airworthiness Directive (AD) 2008-24-14, 
which applied to all Bombardier, Inc., Model CL-600-2B19 (Regional Jet 
Series 100 & 440) airplanes. AD 2008-24-14 required revising the 
instructions for continued airworthiness to incorporate certain 
airworthiness limitations for the main landing gear (MLG) trunnion 
fitting assembly. This AD requires revising the maintenance or 
inspection program, as applicable, to incorporate certain airworthiness 
limitations (AWLs). This AD also requires reworking the trunnion 
fitting in order to meet new structural safe-life limits. This AD was 
prompted by reports of cracks on the MLG trunnion fitting during 
fatigue testing; the introduction of new AWL tasks with revised 
inspection, modification, and safe-life requirements; and a 
determination that the trunnion fitting lower flange and both forward 
and aft bore holes are also subject to fatigue cracking. We are issuing 
this AD to address the unsafe condition on these products.

DATES: This AD is effective July 11, 2019.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of July 11, 
2019.
    The Director of the Federal Register approved the incorporation by 
reference of a certain other publication listed in this AD as of 
December 19, 2008 (73 FR 73785, December 4, 2008).

ADDRESSES: For service information identified in this final rule, 
contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 1Y9, Canada; Widebody Customer Response Center North 
America toll-free telephone 1-866-538-1247 or direct-dial telephone 1-
514-855-2999; fax 514-855-7401; email ac.yul@aero.bombardier.com; 
internet http://www.bombardier.com. You may view this referenced 
service information at the FAA, Transport Standards Branch, 2200 South 
216th St., Des Moines, WA. For information on the availability of this 
material at the FAA, call 206-231-3195. It is also available on the 
internet at http://www.regulations.gov by searching for and locating 
Docket No. FAA-2018-0801.

Examining the AD Docket

    You may examine the AD docket on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0801; or in person at Docket Operations between 9 a.m. and 5 p.m., 
Monday through Friday, except Federal holidays. The AD docket contains 
this final rule, the regulatory evaluation, any comments received, and 
other information. The address for Docket Operations (phone: 800-647-
5527) is U.S. Department of Transportation, Docket Operations, M-30, 
West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE, 
Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aerospace Engineer, 
Airframe and Mechanical Systems Section, FAA, New York ACO Branch, 1600 
Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516-228-7329; 
fax 516-794-5531.

SUPPLEMENTARY INFORMATION: 

Discussion

    We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR 
part 39 to supersede AD 2008-24-14, Amendment 39-15758 (73 FR 73785, 
December 4, 2008) (``AD 2008-24-14''). AD 2008-24-14 applied to all 
Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 440) 
airplanes. The NPRM published in the Federal Register on October 1, 
2018 (83 FR 49317). The NPRM was prompted by reports of cracks on the 
MLG trunnion fitting during fatigue testing; the introduction of new 
AWL tasks with revised inspection, modification, and safe-life 
requirements; and a determination that the trunnion fitting lower 
flange and both forward and aft bore holes are also subject to fatigue 
cracking. The NPRM proposed to require revising the maintenance or 
inspection program, as applicable, to incorporate certain AWLs. The 
NPRM also proposed to require reworking the trunnion fitting in order 
to meet new structural safe-life limits. We are issuing this AD to 
address fatigue cracking of the MLG trunnion fitting. Failure of the 
MLG trunnion fitting could result in MLG collapse.
    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian AD CF-2017-27, dated August 
2, 2017 (referred to after this as the Mandatory Continuing 
Airworthiness Information, or ``the MCAI''), to correct an unsafe 
condition for certain Bombardier, Inc., Model CL-600-2B19 (Regional Jet 
Series 100 & 440) airplanes. The MCAI states:

    Cracks on the main landing gear (MLG) trunnion fitting web 
discovered during fatigue testing led to the issuance of [Canadian] 
AD CF-2008-21 [which corresponds to FAA AD 2008-24-14], which 
mandated new inspection requirements to ensure that fatigue cracking 
of the trunnion web would be detected and corrected.
    Additional fatigue test article findings and in-service findings 
have shown that the trunnion fitting lower flange and both forward 
and aft bore holes are also subject to fatigue cracking. Failure of 
the main landing gear trunnion fitting could result in the collapse 
of the main landing gear. Bombardier Inc. has decided to implement a 
series of design changes to improve the fatigue life of the trunnion 
fitting that is now a safe-life assembly.
    New and revised Airworthiness Limitation (AWL) tasks for the MLG 
trunnion fitting

[[Page 26335]]

assembly have been introduced in order to require new inspection, 
modification, and safe-life requirements. This [Canadian] AD 
mandates the incorporation of these new and revised AWL tasks, and 
removal of the AWL tasks they replace, to ensure that fatigue 
cracking of the MLG trunnion fitting is detected and corrected. This 
[Canadian] AD also requires rework of the trunnion fitting in order 
to meet new structural safe-life limits.

    You may examine the MCAI in the AD docket on the internet at http://www.regulations.gov by searching for and locating Docket No. FAA-2018-
0801.

Comments

    We gave the public the opportunity to participate in developing 
this final rule. The following presents the comments received on the 
NPRM and the FAA's response to each comment.

Support for the NPRM

    Air Line Pilots Association, International stated its support for 
the NPRM.

Request To Clarify Compliance Times in Paragraph (l) of the Proposed AD

    Air Wisconsin Airlines requested that we clarify the compliance 
times for the rework specified in paragraph (l) of the proposed AD. Air 
Wisconsin Airlines stated that the AWLs do not include requirements to 
incorporate the service information identified in paragraph (l)(1), 
(l)(2), and (l)(3) of this AD. Air Wisconsin Airlines added that 
Bombardier Service Bulletin 601R-57-046, Revision C, dated December 20, 
2012, would be required only if Bombardier Service Bulletin 601R-57-
048, Revision C, dated June 6, 2013, is done and therefore there is no 
requirement to do Bombardier Service Bulletin 601R-57-046, Revision C, 
dated December 20, 2012.
    We agree to clarify the compliance times for the rework required by 
paragraph (l) of this AD. We acknowledge that the compliance times for 
incorporating the rework are not clear. We note that Bombardier Service 
Bulletin 601R-57-046, Revision C, dated December 20, 2012, is not 
contingent on whether Bombardier Service Bulletin 601R-57-048, Revision 
C, dated June 6, 2013, is done. As specified in certain AWLs, ``SB 
601R-57-046 shall be incorporated at or before 34,900 flight cycles.''
    However, we acknowledge that the AWLs do not specify requirements 
to incorporate Bombardier Service Bulletin 601R-57-047, Revision B, 
dated October 2, 2012; and Bombardier Service Bulletin 601R-57-048, 
Revision C, dated June 6, 2013. Since the AWLs do not specify 
compliance times for incorporating that service information, operators 
would need to accomplish the actions specified in that service 
information within 2,000 flight cycles after the effective date of this 
AD.
    However, we have determined that the actions specified in 
Bombardier Service Bulletin 601R-57-046, Revision C, dated December 20, 
2012; Bombardier Service Bulletin 601R-57-047, Revision B, dated 
October 2, 2012; and Bombardier Service Bulletin 601R-57-048, Revision 
C, dated June 6, 2013; must be done within the initial compliance times 
specified in the service information, or within 2,000 flight cycles 
after the effective date of this AD, whichever occurs later. We have 
coordinated with TCCA to clarify the compliance times for incorporating 
the service information. We have added compliance times to paragraphs 
(l)(1) through (l)(3) of this AD accordingly.

Request To Reword Requirement Paragraph

    Air Wisconsin Airlines requested that paragraph (g) of the proposed 
AD be reworded to indicate that paragraph (f)(1) of AD 2008-24-14 
required incorporation of Bombardier Maintenance Requirements Manual 
(MRM), CSP A-253, Part 2, Appendix B task AWL 57-21-161, because 
Temporary Revision (TR) 2B-2136 (Global alternative method of 
compliance (AMOC) with log #14-83) was superseded by TR 2B-2153 and 
later incorporated into a general revision of Bombardier Maintenance 
Requirements Manual (MRM), CSP A-253, Part 2, Appendix B.
    We disagree, because the requirements specified in paragraph (g) of 
this AD are a restatement of the actions required by paragraph (f)(1) 
of AD 2008-24-14 and are still applicable until the new actions 
required by paragraph (i) of this AD are done. The FAA cannot impose 
the latest requirements for a paragraph that has the initial compliance 
date of AD 2008-24-14 since the latest documents were not available at 
the time that AD 2008-24-14 became effective. Additionally, paragraph 
(i) of this AD addresses the commenter's concerns regarding the latest 
documents. For clarity, we have added a statement to paragraph (i) of 
this AD to specify that accomplishing the revision required by 
paragraph (i) of this AD terminates the revision required by paragraph 
(g) of this AD.

Request To Clarify Compliance Table Reference

    Air Wisconsin Airlines observed that the reference to ``table 1 or 
table 2 to paragraphs (g) and (j) of this AD, as applicable'' in 
paragraph (g) was not in AD 2008-24-14 and therefore is a change to 
that paragraph, because paragraph (j) is a new requirement of the 
proposed AD. We infer that the commenter would like us to clarify the 
inclusion of a reference to ``paragraph (j)'' within paragraph (g) of 
the proposed AD.
    We agree to clarify the paragraph in question. The inclusion of 
``paragraph (j)'' within paragraph (g) of this AD is merely as part of 
the designation of one of the tables referenced and has no bearing upon 
the requirements of paragraph (g) of this AD. 1 CFR parts 8 and 21 
require orderly codification of regulations. This means that all 
elements of an AD, including tables and figures, must be properly 
designated. A table's designation includes the sequential number of the 
table, the paragraphs to which it applies, and the location of the 
table within the AD. The Office of the Federal Register (OFR) requires 
a complete designation when a table is cross-referenced. Both of the 
tables in question are referenced in paragraphs (g) and (j) of this AD, 
therefore, the correct reference is to ``table 1 to paragraphs (g) and 
(j)'' and ``table 2 to paragraphs (g) and (j),'' as stated in 
paragraphs (g) and (j) of this AD. We have not changed this AD with 
regard to table designations.

Request To Reword Compliance Time

    Air Wisconsin Airlines requested that we reword the compliance time 
statement in paragraph (j)(2) of the proposed AD to specify the 
compliance time instead of referring to the AWL. The commenter stated 
that rewording would simplify the paragraph.
    We acknowledge the commenter's request. However, the information is 
contained in the AWL and we matched the language in the MCAI by 
referring to the AWL. Unless the language in the MCAI is not 
enforceable, we generally do not deviate from the MCAI. We have not 
changed this AD in this regard.

Request To Address Missing Compliance Time

    Bombardier requested that we add paragraph (j)(4) to the proposed 
AD in order to align with the instructions in paragraph B.3. of the 
MCAI. Bombardier stated that paragraph (j)(3) of the proposed AD 
mentions the compliance time for the initial inspection but not for the 
limitation for AWL 57-21-145 and AWL 57-21-155. Additionally, Air 
Wisconsin Airlines asked whether our intent in paragraph (j)(3) of the 
proposed AD was to ``speak only to the initial inspections in AWL 57-
21-145 and AWL 57-21-155.'' We infer Air

[[Page 26336]]

Wisconsin Airlines is also requesting that we address the missing 
compliance time statement for the limitation sections of AWL 57-21-145 
and AWL 57-21-155.
    We agree with the request to include the information in paragraph 
B.3. of the MCAI in this AD. The compliance time in paragraph B.3. of 
the MCAI includes the grace period for both the initial inspection and 
the limitation sections of the AWLs. We have added paragraph (j)(4) of 
this AD to address the compliance time for the limitation sections of 
AWL 57-21-145 and AWL 57-21-155.

Request To Combine ``No Alternative Actions or Intervals'' Paragraphs

    Air Wisconsin Airlines requested that we consider combining 
paragraphs (h) and (k) of the proposed AD. The commenter asserted that 
paragraph (h) of the proposed AD does not restate the requirement of 
paragraph (f)(2) of AD 2008-24-14.
    We do not agree to the request to combine paragraphs (h) and (k) of 
this AD because the retained and new requirements are addressed 
separately in this supersedure AD. Paragraph (h) of this AD restates 
the requirements of paragraph (f)(2) of AD 2008-24-14, with a new 
exception. Paragraph (h) of this AD applies to the retained action 
required by paragraph (g) of this AD while paragraph (k) of this AD 
applies to the new action required by paragraph (i) of this AD. We have 
not changed this AD in this regard.

Request To Clarify Figure Reference

    Air Wisconsin Airlines requested that we clarify the reference to 
``the AWLs identified in figure 1 to paragraphs (i) and (o)'' in 
paragraph (o) of the proposed AD. The commenter remarked that no AWLs 
are specifically listed in paragraph (o) of the proposed AD.
    We agree to clarify the figure reference in paragraph (o) of this 
AD. The AWLs are specifically listed in figure 1, which is designated 
``figure 1 to paragraphs (i)(1) and (o).'' Paragraphs (i)(1) and (o) 
both reference that figure. As previously mentioned, OFR requires that 
the designation of any figure in an AD must include all paragraphs in 
which it is referenced, and the full designation is required in each 
reference. The correct designation of the figure in question is 
``figure 1 to paragraphs (i)(1) and (o),'' as referenced in paragraphs 
(i)(1) and (o) of this AD. We have not changed this AD with regard to 
figure designations.

Request To Revise Paragraph (l) of the Proposed AD

    Air Wisconsin Airlines requested that we revise paragraph (l) of 
the proposed AD to state that the compliance time for the limitation 
section is at the applicable time specified in the applicable AWLs.
    As stated previously, we have revised paragraph (l) of this AD to 
specify the compliance times for the rework. We note that the 
compliance times for the limitation sections are provided in paragraphs 
(j)(2) and (j)(4) of this AD. If affected parts are removed and 
replaced with MLG trunnion, part numbers 601R10068-5 and -6, the 
inspection and limitation sections compliance times of the affected 
AWLs start from the installation of the new part numbers 601R10068-5 
and -6. After the part replacement, the inspections and limitation 
sections of AWL 57-21-155 and AWL 57-21-161 still apply.

Clarification of Compliance Times

    Where the compliance times for the repetitive inspections and life 
limits specified in the TRs identified in figure 1 to paragraphs (i)(1) 
and (o) of this AD specify ``landings,'' those compliance times are 
based on the landings of the affected part. The compliance times for 
the initial inspections are specified in paragraphs (j)(1) and (j)(3) 
of this AD and those compliance times are based on flight cycles or 
landings of the airplane. We have clarified the compliance times in 
paragraphs (i) and (j)(3) of this AD.

Conclusion

    We reviewed the relevant data, considered the comments received, 
and determined that air safety and the public interest require adopting 
this final rule with the changes described previously and minor 
editorial changes. We have determined that these minor changes:
     Are consistent with the intent that was proposed in the 
NPRM for addressing the unsafe condition; and
     Do not add any additional burden upon the public than was 
already proposed in the NPRM.
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this final 
rule.

Related Service Information Under 1 CFR Part 51

    Bombardier has issued the following service information.
     Bombardier Service Bulletin 601R-57-046, Revision C, dated 
December 20, 2012, describes the cold working of fastener holes in the 
MLG trunnion fitting, and related investigative and corrective actions.
     Bombardier Service Bulletin 601R-57-047, Revision B, dated 
October 2, 2012, describes the installation of forcemate bushings in 
the MLG trunnion, and related investigative and corrective actions.
     Bombardier Service Bulletin 601R-57-048, Revision C, dated 
June 6, 2013, describes the cold working of holes on the web of the MLG 
trunnion, and related investigative and corrective actions.
    Bombardier has also issued the following temporary revisions (TRs), 
which are distinct because they describe different AWL tasks that apply 
to different Canadair part numbers.
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2237, dated June 19, 2014. This TR describes AWL task 57-
21-145, MLG Mounting Trunnion Fitting Assembly (Pre-SB 601R-57-047).
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2238, dated June 19, 2014. This TR describes AWL task 57-
21-161, MLG Mounting Trunnion Web at WS66 (Pre-SB 601R-57-046 or Pre-SB 
601R-57-048).
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2239, dated June 19, 2014. This TR describes AWL task 57-
21-155, MLG Mounting Trunnion Fitting Assembly (Pre-SB 601R-57-046 or 
Pre-SB 601R-57-048).
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2241, dated June 19, 2014. This TR describe AWL tasks 57-
21-162, MLG Mounting Trunnion Assembly; and 57-21-163, MLG Mounting 
Trunnion Assembly.
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2242, dated June 19, 2014. This TR removes certain AWL 
tasks.
     Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2246, dated November 7, 2014. This TR describes AWL tasks 
57-21-162, MLG Mounting Trunnion Assembly; and 57-21-163, MLG Mounting 
Trunnion Assembly.
    This AD also requires Bombardier Temporary Revision 2B-2136, dated 
May 1, 2008, to the Bombardier CL-600-2B19 Maintenance Requirements 
Manual, Part 2, Appendix B--Airworthiness Limitations, which the 
Director of the Federal Register approved for incorporation by 
reference as of December 19, 2008 (73 FR 73785, December 4, 2008).
    This service information is reasonably available because the 
interested parties

[[Page 26337]]

have access to it through their normal course of business or by the 
means identified in the ADDRESSES section.

Costs of Compliance

    We estimate that this AD affects 460 airplanes of U.S. registry. We 
estimate the following costs to comply with this AD:

                                                          Estimated Costs for Required Actions
--------------------------------------------------------------------------------------------------------------------------------------------------------
               Action                      Labor cost          Parts cost               Cost per product                   Cost on U.S. operators
--------------------------------------------------------------------------------------------------------------------------------------------------------
Retained actions from AD 2008-24-14  1 work-hour x $85 per               $0  $85..................................  $39,100.
                                      hour = $85.
New actions........................  Up to 178 work-hours x          38,928  Up to $54,058........................  Up to $24,866,680.
                                      $85 per hour = Up to
                                      $15,130.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    We have determined that revising the maintenance or inspection 
program takes an average of 90 work-hours per operator, although we 
recognize that this number may vary from operator to operator. In the 
past, we have estimated that this action takes 1 work-hour per 
airplane. Since operators incorporate maintenance or inspection program 
changes for their affected fleet(s), we have determined that a per-
operator estimate is more accurate than a per-airplane estimate. 
Therefore, we estimate the total cost per operator to be $7,650 (90 
work-hours x $85 per work-hour).
    We have received no definitive data that would enable us to provide 
cost estimates for the on-condition actions specified in this AD.
    According to the manufacturer, some or all of the costs of this AD 
may be covered under warranty, thereby reducing the cost impact on 
affected individuals. We do not control warranty coverage for affected 
individuals. As a result, we have included all costs in our cost 
estimate.

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.
    This AD is issued in accordance with authority delegated by the 
Executive Director, Aircraft Certification Service, as authorized by 
FAA Order 8000.51C. In accordance with that order, issuance of ADs is 
normally a function of the Compliance and Airworthiness Division, but 
during this transition period, the Executive Director has delegated the 
authority to issue ADs applicable to transport category airplanes and 
associated appliances to the Director of the System Oversight Division.

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 that 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);
    3. Will not affect intrastate aviation in Alaska; and
    4. 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.

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 removing Airworthiness Directive (AD) 
2008-24-14, Amendment 39-15758 (73 FR 73785, December 4, 2008), and 
adding the following new AD:

2019-08-11 Bombardier, Inc.: Amendment 39-19632; Docket No. FAA-
2018-0801; Product Identifier 2017-NM-147-AD.

(a) Effective Date

    This AD is effective July 11, 2019.

(b) Affected ADs

    This AD replaces AD 2008-24-14, Amendment 39-15758 (73 FR 73785, 
December 4, 2008) (``AD 2008-24-14'').

(c) Applicability

    This AD applies to Bombardier, Inc., Model CL-600-2B19 (Regional 
Jet Series 100 & 440) airplanes, certificated in any category, 
serial numbers 7002 and subsequent.

(d) Subject

    Air Transport Association (ATA) of America Code 57, Wings.

(e) Reason

    This AD was prompted by reports of cracks on the main landing 
gear (MLG) trunnion fitting during fatigue testing; the introduction 
of new airworthiness limitation (AWL) tasks with revised inspection, 
modification, and safe-life requirements; and a determination that 
the trunnion fitting lower flange and both forward and aft bore 
holes are also subject to fatigue cracking. We are issuing this AD 
to address fatigue cracking of the MLG trunnion fitting. Failure of 
the MLG trunnion fitting could result in MLG collapse.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Retained Revision of Airworthiness Limitation Section With No 
Changes

    This paragraph restates the requirements of paragraph (f)(1) of 
AD 2008-24-14, with no changes. Within 30 days after December 19, 
2008 (the effective date of AD 2008-24-14), revise the Airworthiness 
Limitations Section (ALS) of the Instructions for Continued 
Airworthiness to incorporate AWL 57-21-161, as identified in 
Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to the 
Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, 
Appendix B--

[[Page 26338]]

Airworthiness Limitations. The initial compliance time for the task 
starts from the applicable time specified in table 1 to paragraphs 
(g) and (j) of this AD or table 2 to paragraphs (g) and (j) of this 
AD, as applicable. Repeat the inspection thereafter at the 
applicable interval specified in Bombardier Temporary Revision 2B-
2136, dated May 1, 2008.
BILLING CODE 4910-13-P
[GRAPHIC] [TIFF OMITTED] TR06JN19.000

[GRAPHIC] [TIFF OMITTED] TR06JN19.001

(h) Retained No Alternative Actions or Intervals With New Exception

    This paragraph restates the requirements of paragraph (f)(2) of 
AD 2008-24-14, with a new exception: Except as required by paragraph 
(i) of this AD, after accomplishing the actions specified in 
paragraph (g) of this AD, no alternative inspections or inspection 
intervals may be used unless the inspection or inspection interval 
is approved as an alternative method of compliance (AMOC) in 
accordance with the procedures specified in paragraph (p)(1) of this 
AD.

(i) New Requirement of This AD: Revision of Existing Maintenance or 
Inspection Program

    (1) Within 60 days after the effective date of this AD: Revise 
the existing maintenance or inspection program, as applicable, by 
incorporating the AWL tasks specified in figure 1 to paragraphs 
(i)(1) and (o) of this AD. Except as specified in paragraph (j) of 
this AD, the initial compliance times for the tasks are at the 
applicable times specified in the temporary revisions (TRs) 
identified in figure 1 to paragraphs (i)(1) and (o) of this AD, or 
within 60 days after the effective date of this AD, whichever occurs 
later. When the information in AWL tasks identified in the TRs 
specified in figure 1 to paragraphs (i)(1) and (o) of this AD has 
been included in the general revisions of Bombardier Maintenance

[[Page 26339]]

Requirements Manual (MRM), CSP A-053, Part 2, Appendix B, the 
general revisions may be inserted in the MRM, and the TRs may be 
removed. Accomplishing the revision required by this paragraph 
terminates the actions required by paragraph (g) of this AD. Where 
the compliance times for the repetitive inspections and life limits 
specified in the TRs identified in figure 1 to paragraphs (i)(1) and 
(o) of this AD specify ``landings,'' those compliance times are 
based on the landings of the affected part.
[GRAPHIC] [TIFF OMITTED] TR06JN19.002

    (2) Within 60 days after the effective date of this AD: Revise 
the existing maintenance or inspection program, as applicable, by 
removing the AWL tasks specified in figure 2 to paragraph (i)(2) of 
this AD.
[GRAPHIC] [TIFF OMITTED] TR06JN19.003

BILLING CODE 4910-13-C

(j) New Requirement of This AD: Initial Compliance Times for AWL Tasks

    (1) For AWL 57-21-161, the compliance time for the initial 
inspection of AWL 57-21-161 is as specified in table 1 to paragraphs 
(g) and (j) of this AD or table 2 to paragraphs (g) and (j) of this 
AD, as applicable, or within 60 days after the effective date of 
this AD, whichever occurs later.
    (2) For AWL 57-21-161, the compliance time for the limitation 
section is at the applicable time specified in AWL 57-21-161 or 
within 2,000 flight cycles after the effective date of this AD, 
whichever occurs later.
    (3) For AWL 57-21-145 and AWL 57-21-155, the compliance times 
for the initial inspections are at the applicable times specified in 
AWL 57-21-145 and AWL 57-21-155 or within 2,000 flight cycles after 
the effective date of this AD, whichever occurs later. Where the 
compliance times for the initial inspections in the AWLs specify 
``landings,'' those compliance times are based on the landings of 
the airplane.
    (4) For AWL 57-21-145 and AWL 57-21-155, the compliance times 
for the limitation sections is at the applicable time specified in 
AWL 57-21-145 and AWL 57-21-155 or within 2,000 flight cycles after 
the effective date of this AD, whichever occurs later.

(k) New Requirement of This AD: No Alternative Actions or Intervals

    After the maintenance or inspection program has been revised as 
required by paragraph (i) of this AD, no alternative actions (e.g., 
inspections) or intervals may be used unless the actions or 
intervals are approved as an AMOC in accordance with the procedures 
specified in paragraph (p)(1) of this AD.

(l) New Requirement of This AD: Rework of MLG Trunnion To Meet 
Structural Safe-Life Limits

    (1) Except as specified in paragraph (m)(1) of this AD: At or 
before the accumulation of 34,900 total flight cycles, or within 
2,000 flight cycles after the effective date of this AD, whichever 
occurs later, rework the MLG trunnion (cold working of fastener 
holes in the MLG trunnion fitting, and all applicable related 
investigative and corrective actions) in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 601R-57-
046, Revision C, dated December 20, 2012. Do all applicable related 
investigative and corrective actions before further flight.
    (2) At or before the accumulation of 38,900 total flight cycles, 
or within 2,000 flight cycles after the effective date of this AD, 
whichever occurs later, rework the MLG trunnion (installation of 
forcemate bushings in the MLG trunnion, and all applicable related 
investigative and corrective actions) in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 601R-57-
047, Revision B, dated October 2, 2012. Do all applicable related 
investigative and corrective actions before further flight.
    (3) Except as specified in paragraph (m)(2) of this AD: At or 
before the accumulation of 34,900 total flight cycles, or within 
2,000 flight cycles after the effective date of this AD, whichever 
occurs later, rework the MLG trunnion (cold work of holes on the web 
of the MLG trunnion, and all applicable related

[[Page 26340]]

investigative and corrective actions) in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 601R-57-
048, Revision C, dated June 6, 2013. Do all applicable related 
investigative and corrective actions before further flight.

(m) Exceptions To Rework Specified in Paragraph (l) of This AD

    (1) For airplanes on which Bombardier Service Bulletin 601R-57-
046, Revision A, dated December 21, 2009; or Bombardier Service 
Bulletin 601R-57-046, Initial Issue, dated July 17, 2009; was 
accomplished prior to the effective date of this AD: Within 6 months 
after the effective date of this AD, do Part G of the Accomplishment 
Instructions of Bombardier Service Bulletin 601R-57-046, Revision C, 
dated December 20, 2012.
    (2) For airplanes on which Bombardier Service Bulletin 601R-57-
048, Revision A, dated November 24, 2009; or Bombardier Service 
Bulletin 601R-57-048, Initial Issue, dated July 17, 2009; was 
accomplished prior to the effective date of this AD: Within 6 months 
after the effective date of this AD, do Part C of the Accomplishment 
Instructions of Bombardier Service Bulletin 601R-57-048, Revision C, 
dated June 6, 2013.

(n) Credit for Previous Actions

    (1) This paragraph provides credit for actions required by 
paragraph (l)(1) of this AD, if those actions were performed before 
the effective date of this AD, using Bombardier Service Bulletin 
601R-57-046, Revision B, dated August 24, 2012.
    (2) This paragraph provides credit for actions required by 
paragraph (l)(2) of this AD, if those actions were performed before 
the effective date of this AD, using the service information 
specified in paragraph (n)(2)(i) or (n)(2)(ii) of this AD.
    (i) Bombardier Service Bulletin 601R-57-047, Revision A, dated 
February 1, 2012.
    (ii) Bombardier Service Bulletin 601R-57-047, Initial Issue, 
dated June 29, 2011.
    (3) This paragraph provides credit for actions required by 
paragraph (l)(3) of this AD, if those actions were performed before 
the effective date of this AD, using Bombardier Service Bulletin 
601R-57-048, Revision B, dated August 24, 2012.
    (4) This paragraph provides credit for actions required by 
paragraph (m)(1) of this AD, if those actions were performed before 
the effective date of this AD, using Part G of the Accomplishment 
Instructions of Bombardier Service Bulletin 601R-57-046, Revision B, 
dated August 24, 2012.
    (5) This paragraph provides credit for actions required by 
paragraph (m)(2) of this AD, if those actions were performed before 
the effective date of this AD, using Part C of the Accomplishment 
Instructions of Bombardier Service Bulletin 601R-57-048, Revision B, 
dated August 24, 2012.

(o) Repairs and Alternative Actions or Intervals

    (1) If any damage is found during an inspection required by the 
AWLs identified in figure 1 to paragraphs (i)(1) and (o) of this AD, 
repair before further flight using a method approved by the Manager, 
New York ACO Branch, FAA; or Transport Canada Civil Aviation (TCCA); 
or Bombardier, Inc.'s TCCA Design Approval Organization (DAO). If 
approved by the DAO, the approval must include the DAO-authorized 
signature. The approved repair instructions must specifically refer 
to this AD or Canadian AD CF-2017-27, dated August 2, 2017.
    (2) Repairs approved by Bombardier, Inc., that deviate from the 
AWLs identified in figure 1 to paragraphs (i)(1) and (o) of this AD 
are acceptable methods of compliance if approved by the Manager, New 
York ACO Branch, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO. If 
approved by the DAO, the approval must include the DAO-authorized 
signature. The approved repair instructions must specifically refer 
to this AD or Canadian AD CF-2017-27, dated August 2, 2017.
    (3) For repairs approved before the effective date of this AD 
that affect the AWLs identified in figure 1 to paragraphs (i)(1) and 
(o) of this AD and the approved repair instructions do not 
specifically refer to Canadian AD CF-2017-27, dated August 2, 2017: 
Within 6 months of the effective date of this AD, contact the 
Manager, New York ACO Branch, FAA; or TCCA; or Bombardier, Inc.'s 
TCCA DAO Inc., for new or revised limitations or inspection 
requirements on the repair area and comply with the revised 
limitations or inspection requirements. The new or revised 
limitations or inspection requirements must specifically refer to 
this AD or Canadian AD CF-2017-27, dated August 2, 2017.
    (4) Canadian AMOC No. AARDG-2018/A21, dated May 1, 2018, which 
was approved before the effective date of this AD by TCCA, is an 
acceptable method of compliance to the corresponding requirements of 
this AD.

(p) Other FAA AD Provisions

    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York ACO Branch, 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 manager of the certification 
office, send it to ATTN: Program Manager, Continuing Operational 
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 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.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain corrective actions from a manufacturer, the action must be 
accomplished using a method approved by the Manager, New York ACO 
Branch, FAA; or TCCA; or Bombardier, Inc.'s TCCA DAO. If approved by 
the DAO, the approval must include the DAO-authorized signature. The 
approved corrective action instructions must specifically refer to 
this AD or Canadian AD CF-2017-27, dated August 2, 2017.

(q) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian AD CF-2017-27, dated August 2, 2017, for related 
information. This MCAI may be found in the AD docket on the internet 
at http://www.regulations.gov by searching for and locating Docket 
No. FAA-2018-0801.
    (2) For more information about this AD, contact Aziz Ahmed, 
Aerospace Engineer, Airframe and Mechanical Systems Section, FAA, 
New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 
11590; telephone 516-228-7329; fax 516-794-5531.
    (3) Service information identified in this AD that is not 
incorporated by reference is available at the addresses specified in 
paragraphs (r)(5) and (r)(6) of this AD.

(r) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless this AD specifies otherwise.
    (3) The following service information was approved for IBR on 
July 11, 2019.
    (i) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2237, dated June 19, 2014.
    (ii) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2238, dated June 19, 2014.
    (iii) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2239, dated June 19, 2014.
    (iv) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2241, dated June 19, 2014.
    (v) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2242, dated June 19, 2014.
    (vi) Bombardier Maintenance Requirements Manual Temporary 
Revision 2B-2246, dated November 7, 2014.
    (vii) Bombardier Service Bulletin 601R-57-046, Revision C, dated 
December 20, 2012.
    (viii) Bombardier Service Bulletin 601R-57-047, Revision B, 
dated October 2, 2012.
    (ix) Bombardier Service Bulletin 601R-57-048, Revision C, dated 
June 6, 2013.
    (4) The following service information was approved for IBR on 
December 19, 2008 (73 FR 73785, December 4, 2008).
    (i) Bombardier Temporary Revision 2B-2136, dated May 1, 2008, to 
the Bombardier CL-600-2B19 Maintenance Requirements Manual, Part 2, 
Appendix B--Airworthiness Limitations.
    (ii) [Reserved]
    (5) For service information identified in this AD, contact 
Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 1Y9, Canada; Widebody Customer Response Center 
North America toll-free telephone 1-866-538-1247 or direct-dial 
telephone 1-514-855-2999; fax 514-855-7401; email 
ac.yul@aero.bombardier.com; internet http://www.bombardier.com.
    (6) You may view this service information at the FAA, Transport 
Standards Branch, 2200 South 216th St., Des Moines, WA. For 
information on the availability of this material at the FAA, call 
206-231-3195.
    (7) You may view this service information that is incorporated 
by reference at the

[[Page 26341]]

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/cfr/ibr-locations.html.

    Issued in Des Moines, Washington, on May 15, 2019.
Michael Kaszycki,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2019-11830 Filed 6-5-19; 8:45 am]
BILLING CODE 4910-13-P