Document ID: FAA-2018-0794-0010
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: Bombardier, Inc., Airplanes
Posted Date: 2019-06-07T04:00Z

[Federal Register Volume 84, Number 110 (Friday, June 7, 2019)]
[Rules and Regulations]
[Pages 26548-26556]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-11956]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2018-0794; Product Identifier 2017-NM-175-AD; Amendment 
39-19625; AD 2019-08-04]
RIN 2120-AA64

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) 2012-25-02, 
which applied to certain Bombardier, Inc., Model CL-600-2B19 (Regional 
Jet Series 100 & 440) airplanes. AD 2012-25-02 required revising the 
airworthiness limitations section (AWL) of the instructions for 
continued airworthiness (ICA) of the maintenance requirements manual 
(MRM) by incorporating new procedures for repetitive inspections for 
cracking of the rear pressure bulkhead (RPB). AD 2012-25-02 also 
required revising the maintenance or inspection program to incorporate 
a revised task. This AD also mandates modification of the RPB and adds 
repetitive inspections for cracking of the RPB web, which terminates 
certain actions in this AD. This AD was prompted by additional in-
service crack findings, which resulted in the development of a 
structural modification to the RPB. We are issuing this AD to address 
the unsafe condition on these products.

DATES: This AD is effective July 12, 2019.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of July 12, 
2019.
    The Director of the Federal Register approved the incorporation by 
reference of a certain other publication listed in this AD as of 
January 16, 2013 (77 FR 73902, December 12, 2012).

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 
514-855-5000; 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-2018-0794.

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-
0794; 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 2012-25-02, Amendment 39-17283 (77 FR 73902, 
December 12, 2012) (``AD 2012-25-02''). AD 2012-25-02 applied to 
certain Bombardier, Inc., Model CL-600-2B19 (Regional Jet Series 100 & 
440) airplanes. The NPRM published in the Federal Register on September 
13, 2018 (83 FR 46428). The NPRM was prompted by additional in-service 
crack findings, which resulted in the development of a structural 
modification to the RPB. The NPRM proposed to continue to require 
revising the AWL of the ICA of the MRM by incorporating new procedures 
for repetitive inspections for cracking of the

[[Page 26549]]

RPB. The NPRM also proposed to mandate modification of the RPB and add 
repetitive inspections for cracking of the RPB web, which would 
terminate certain actions in this AD. We are issuing this AD to address 
cracking in the RPB, which could result in reduced structural integrity 
and rapid decompression of the airplane.
    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian Airworthiness Directive CF-
2011-30R2, dated June 12, 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 forward face of the Rear Pressure Bulkhead (RPB) 
web have been discovered on three CL-600-2B19 aeroplanes in-service.
    A Temporary Revision has been made to Part 2 of the Maintenance 
Requirements Manual (MRM) to revise the existing AWL task by 
introducing an improved Non-Destructive Inspection (NDI) procedure 
to ensure that fatigue cracking of the RPB is detected and 
corrected.
    The original issue of this [TCCA] AD [which corresponds to FAA 
AD 2012-25-02] mandated the incorporation of a new NDI procedure for 
AWL task number 53-61-153.
    Additional in-service findings have resulted in the issue of 
revision 1 of this [TCCA] AD, which mandates a structural 
modification to the rear pressure bulkhead with revised threshold 
and repeat inspection intervals. This modification is intended to 
preclude the onset of multiple site fatigue damage for the remaining 
service life of the aeroplane. If not corrected, a failure of the 
RPB could result in loss of structural integrity of the aeroplane.
    Revision 2 of this [TCCA] AD requires an inspection to be 
carried out prior to modification of the RPB. This revision also 
requires an additional modification to be completed on the RPB prior 
to terminating AWL task number 53-61-153. It also includes 
provisions to account for certain repairs as well as [alternative 
methods of compliance] AMOCs issued to earlier revisions of this 
[TCCA] AD.

    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-
0794.

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

    Endeavor Air stated its support for the NPRM.

Request To Add Reference Terminating Action

    Bombardier requested that we revise paragraph (g) of the proposed 
AD to identify the terminating action provided in paragraph (o)(3) of 
the proposed AD. Bombardier pointed out that, since paragraph (g) of 
the proposed AD identifies terminating action in paragraph (m) of the 
proposed AD, paragraph (g) of the proposed AD should also identify the 
terminating action provided in paragraph (o)(3) of the proposed AD for 
consistency.
    We do not agree to add reference to paragraph (o)(3) in the 
introductory text of paragraph (g) of this AD. Instead, because 
paragraph (o) of this AD already contains all of the terminating 
actions for paragraph (g) of this AD, for simplicity and consistency we 
have revised paragraph (g) of this AD to remove reference to 
terminating actions that were identified in the proposed AD. This 
change does not change the intent or requirements of paragraph (g) of 
this AD.

Request To Add Alternative Service Information for Repair

    Bombardier requested that we revise paragraph (k) of the proposed 
AD to reference Bombardier Repair Engineering Order (REO) 601R-53-61-
1285, Revision E, dated October 31, 2016; and Bombardier REO 601R-53-
61-1541, Revision F, dated November 12, 2014; as alternative service 
information for the repair. Bombardier pointed out that this change 
corresponds with the provisions of Part I, section C., of the MCAI.
    We agree with the request. We have determined that the actions 
specified in the alternative service information are acceptable for 
compliance for the repair. Therefore, we have revised paragraph (k)(2) 
of this AD to add the referenced REOs as alternative service 
information for the repair.

Request To Add Credit for Previous Actions Using Previous Service 
Information

    Bombardier requested that we revise paragraph (p) of the proposed 
AD to provide credit for actions done before the effective date of the 
AD using earlier revisions of the service information specified in part 
III, section B., paragraphs (3), (5), (6), and (7) of the MCAI. 
Bombardier did not provide a justification for this request.
    We partially agree with the request to provide credit for 
previously accomplished actions done using the earlier revisions of the 
specified service information. We have determined that the service 
information specified in part III, section B., paragraphs (3), (5), 
(6), and (7) of the MCAI is acceptable for accomplishing the applicable 
actions before the effective date of this AD, provided certain actions 
are done using the required service information. Therefore, we have 
added paragraph (p) to this AD to include the requested credit, and 
have redesignated subsequent paragraphs accordingly.

Request To Allow Approved Alternative Actions and Intervals

    Endeavor Air requested that we revise paragraph (n) of the proposed 
AD, which would prohibit alternative actions and intervals once 
revision of the maintenance or inspection program is accomplished, 
except as approved in paragraph (p)(1) of the proposed AD (which 
specified approval by the FAA only). The commenter asserted that 
alternative actions and intervals should be allowed if approved by 
specifying ``paragraph (p)(1) or (p)(2)'' (paragraph (p)(2) specified 
approval by the FAA, TCCA, or the TCCA Design Approval Organization 
(DAO)). The commenter stated that this change would reduce unnecessary 
time and paperwork by eliminating the need for AMOC approval by the FAA 
after the operator has already received a generic REO (GREO) or REO 
that is TCCA DAO approved.
    We do not agree to add reference to paragraph (q)(2) of this AD 
(paragraph (p)(2) of the proposed AD) in paragraph (n) of this AD. 
Since we do not currently have the authority to delegate AMOC approvals 
to foreign civil aviation authorities, the FAA is responsible for these 
approvals. We have not changed this AD in this regard.

Request To Allow Deviations to Certain Service Information

    Air Wisconsin requested that necessary deviations from the 
instructions in Bombardier REO 601R-53-61-1240, Revision D, dated 
October 31, 2016, be acceptable along with this REO for compliance with 
the requirements of paragraph (j)(2) of the proposed AD. Air Wisconsin 
pointed out that paragraph (j)(2) of the proposed AD would require a 
modification in accordance with Bombardier REO 601R-53-61-1240, 
Revision D, dated October 31, 2016, and reported that it has 
incorporated this REO on several of its airplanes. In some cases, Air 
Wisconsin stated that it found it necessary to deviate from the 
instructions of this REO (e.g., plugging holes with fasteners or 
installation of next oversize fastener). Therefore, since there are no 
approved deviations to the

[[Page 26550]]

inspection procedures in this REO, Air Wisconsin suggested that 
necessary deviations to this REO be considered acceptable under the 
following conditions:
     The deviation is approved by signature by TCCA or 
Bombardier, Inc.'s TCCA DAO; and
     The damage-tolerance analysis was performed as shown by 
the entry in block 6 (Additional Limitations) of the REO and the entry 
was determined to be ``None.''
    We do not agree with the commenter's request. We do not consider it 
appropriate to include various provisions in an AD applicable only to 
an operator's unique configuration of affected airplanes. However, if 
an operator with an affected airplane cannot accomplish the required 
actions specified in the service information, or prefers to use 
different service information that is specific to their design, an AMOC 
can be requested in accordance with the provisions specified in 
paragraph (q) of this AD.
    Further, as we explained in the ``Differences Between this Proposed 
AD and the Service Information'' section in the NPRM, the MCAI includes 
the following statement: ``If it is not possible to complete all of the 
instructions in Part II of this [Canadian] AD due to the configuration 
of the aeroplane . . . contact Bombardier Inc. . . . for approved 
instructions.'' This issue is addressed in 14 CFR 39.17, which states 
that ``If a change in a product affects your ability to accomplish the 
actions required by the AD in any way, you must request FAA approval of 
an AMOC . . . .'' Since we do not currently have the authority to 
delegate AMOC approvals to foreign civil aviation authorities, the FAA 
is responsible for these approvals.
    We have not changed this AD regarding this issue.

Request To Extend Compliance Time

    SkyWest Airlines (SkyWest) requested that we extend the phase-in 
compliance times required by paragraph (j) of the proposed AD, which 
would require a modification according to a schedule based on 
accumulated flight cycles. SkyWest reported that, due to its fleet 
utilization and the phase-in intervals, the work might need to be done 
outside of a scheduled heavy maintenance visit. SkyWest proposed an 
alternative phase-in schedule to allow a cushion of time in order for 
them to reach the next heavy maintenance visit.
    We do not agree with the commenter's request to extend the phase-in 
compliance times specified in figure 1 to paragraph (j) of this AD. We 
have determined that the compliance times, as proposed, represent the 
maximum interval of time allowable for the affected airplanes to 
continue to safely operate before the modification is done. Since 
maintenance schedules vary among operators, there would be no assurance 
that the airplane would be modified during that maximum interval. 
Further, this commenter did not provide data verifying the safety of 
the proposed intervals. Although we have not changed the AD regarding 
this issue, under the provisions of paragraph (q)(1) of this AD, we 
will consider requests for approval of an alternative compliance time, 
if data are submitted to substantiate that such an adjustment would 
provide an acceptable level of safety. We have not changed this AD in 
this regard.

Request To Clarify Credit for Prior Accomplishment

    Air Wisconsin requested that we revise paragraph (j) of the 
proposed AD to specify that the actions are required ``unless already 
accomplished.'' Air Wisconsin stated that several of its airplanes have 
been modified using the applicable service information.
    We do not agree to revise paragraph (j) of this AD. Paragraph (f) 
of this AD requires compliance with all AD requirements ``unless 
already done.'' Therefore, the commenter's proposed wording is 
unnecessary. We have not changed this AD regarding this issue.

Request for Clarification of Locations for Nondestructive Inspection 
(NDI)

    Air Wisconsin requested that we clarify whether the NDI specified 
in paragraph (j)(1) of the proposed AD is for areas that have not been 
modified using various REOs or Supplemental Type Certificate (STC) 
ST02308NY that would remain in place. The commenter added that the NDI 
may not be possible for those areas modified using Bombardier REO 601R-
53-61-1541; or Bombardier REO 601R-53-61-1285, Revision D, dated 
October 31, 2011, or Revision E, dated October 31, 2016; which were 
approved by certain AMOCs; because the NDI has not yet been developed 
for those areas.
    We agree that clarification is necessary. Unless this AD provides 
specific credit for an existing modification or repair NDI, an 
evaluation needs to be accomplished to determine whether the inspection 
associated with the existing modification or repair meets an acceptable 
level of safety. An AMOC is required for an alternative action based on 
the existing modification or repair. We have not changed this AD 
regarding this issue.

Request for Clarification of Affected Serial Number

    Air Wisconsin noted that paragraph (m) of the proposed AD applies 
to ``any airplane having serial number 7610,'' and asked whether more 
than one Model CL-600-2B19 airplane had that serial number.
    We agree that clarification is necessary. There is only one 
airplane with serial number 7610. We have revised paragraph (m) of this 
AD to specify ``For airplane serial number 7610.''

Request To Clarify Terminating Requirements

    Air Wisconsin requested that we clarify paragraph (o)(1) of the 
proposed AD by explaining how compliance with paragraph (j) or (l) of 
the proposed AD would not entirely terminate the requirements of 
paragraph (g) of the proposed AD.
    We agree that clarification may be necessary. Paragraph (o)(1) of 
this AD specifies that accomplishing the requirements of paragraph (j) 
or (l) terminates the requirements of paragraph (g) of this AD ``for 
the repaired area only.'' The inspections required by paragraph (g) of 
this AD must be repeated for non-repaired areas. This requirement 
corresponds with the MCAI. We have not changed this AD regarding this 
issue.

Request for Credit for Previous Repairs

    Bombardier requested that we revise paragraphs (k)(1) and (k)(2) of 
the proposed AD to give credit for repairs done before the effective 
date of the AD, if those repairs were approved by the FAA, TCCA, or 
Bombardier's TCCA DAO and referred to the MCAI. Bombardier noted that 
this credit is provided in part I, section C., of the MCAI.
    We partially agree. We agree to provide credit for repairs 
specified in paragraphs (k)(1) and (k)(2) of this AD, if those repairs 
were done before the effective date of this AD, and were done in 
accordance with a method approved by the Manager, New York ACO Branch, 
FAA; TCCA; or Bombardier's TCCA DAO; and the approval references TCCA 
AD CF-2011-30, dated August 24, 2011, or AD CF-2011-30R1, dated 
November 1, 2016. However, we do not agree to include that credit in 
paragraphs (k)(1) and (k)(2) of this AD. Instead, we have added 
paragraph (p)(1) to this AD to provide the requested credit. (As 
explained previously, we have redesignated paragraphs (p)(1) and

[[Page 26551]]

(p)(2) of the proposed AD as paragraphs (q)(1) and (q)(2) of this AD.)

Request To Correct Paragraph References

    Bombardier noted a typographical error in paragraph (p)(1)(ii) of 
the proposed AD, which specified that previously approved AMOCs are 
acceptable for ``paragraphs (g), (k), and (l)'' of the proposed AD. 
Bombardier asserted that the correct paragraph references are (g), (h), 
and (i).
    We agree that paragraph (p)(1)(ii) of the proposed AD included a 
typographical error in the paragraph references. We have revised 
paragraph (q)(1)(ii) of this AD (paragraph (p)(1)(ii) of the proposed 
AD) to reference the correct paragraphs.

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, Inc., has issued the following service information.
     Bombardier REO 601R-53-61-1230, Revision F, dated October 
31, 2011. This service information describes procedures for a repair to 
the pressure bulkhead web frame station (FS) 621.00, lintel 
installation.
     Bombardier REO 601R-53-61-1240, Revision D, dated October 
31, 2016. This service information describes procedures for a repair 
and modification to FS 621.00 pressure bulkhead web.
     Bombardier REO 601R-53-61-5828, Revision A, dated March 
16, 2017. This service information describes procedures for a repair to 
FS 621.00 pressure bulkhead web at left buttock line (LBL) 27.5.
    This AD also requires Bombardier Temporary Revision 2B-2187, dated 
June 22, 2011, to Appendix B-Airworthiness Limitations, of Part 2 of 
the Bombardier CL-600-2B19 MRM, which the Director of the Federal 
Register approved for incorporation by reference as of January 16, 2013 
(77 FR 73902, December 12, 2012).
    This service information is reasonably available because the 
interested parties 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 457 airplanes of U.S. registry. We 
estimate the following costs to comply with this AD:

                                                          Estimated Costs for Required Actions
--------------------------------------------------------------------------------------------------------------------------------------------------------
              Labor cost                            Parts cost                        Cost per product                   Cost on U.S.  operators
--------------------------------------------------------------------------------------------------------------------------------------------------------
Up to 917 work-hours x $85 per hour =  Up to $6,000.......................  Up to $83,945......................  Up to $38,362,865.
 $77,945.
--------------------------------------------------------------------------------------------------------------------------------------------------------

    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.

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:

[[Page 26552]]

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) 
2012-25-02, Amendment 39-17283 (77 FR 73902, December 12, 2012), and 
adding the following new AD:

2019-08-04 Bombardier, Inc.: Amendment 39-19625; Docket No. FAA-
2018-0794; Product Identifier 2017-NM-175-AD.

(a) Effective Date

    This AD is effective July 12, 2019.

(b) Affected ADs

    This AD replaces AD 2012-25-02, Amendment 39-17283 (77 FR 73902, 
December 12, 2012) (``AD 2012-25-02'').

(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 through 8025 inclusive, 8030, and 8034.

(d) Subject

    Air Transport Association (ATA) of America Code 53, Fuselage.

(e) Reason

    This AD was prompted by multiple reports of cracks on the 
forward face of the rear pressure bulkhead (RPB) web, and additional 
in-service crack findings that resulted in the development of a 
structural modification to the RPB. We are issuing this AD to 
address cracking in the RPB, which could result in reduced 
structural integrity and rapid decompression of the airplane.

(f) Compliance

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

(g) Retained Revision of the Maintenance Program With Minor Changes

    This paragraph restates the requirements of paragraph (i) of AD 
2012-25-02, with minor changes. Except for the airplane having 
serial number 7002, within 60 days after January 16, 2013 (the 
effective date of AD 2012-25-02): Revise the maintenance program by 
incorporating the revised inspection requirements specified in 
airworthiness limitation section (AWL) 53-61-153 of Bombardier 
temporary revision (TR) 2B-2187, dated June 22, 2011, to Appendix B-
Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 
Maintenance Requirements Manual (MRM). The initial compliance times 
for the task are at the applicable time specified in paragraph 
(g)(1) or (g)(2) of this AD.
    (1) For airplanes on which the special detailed inspection 
specified in AWL 53-61-153 of Bombardier TR 2B-2187, dated June 22, 
2011; or Canadair Regional Jet TR 2B-2109, dated October 13, 2005; 
has not been done as of January 16, 2013 (the effective date of AD 
2012-25-02): The initial compliance time for AWL 53-61-153 is at the 
applicable time specified in paragraph (g)(1)(i) or (g)(1)(ii) of 
this AD.
    (i) For airplanes that have accumulated 10,500 total flight 
cycles or less as of January 16, 2013: Before the accumulation of 
12,000 total flight cycles.
    (ii) For airplanes that have accumulated more than 10,500 total 
flight cycles as of January 16, 2013: Within 1,500 flight cycles 
after January 16, 2013 (the effective date of AD 2012-25-02).
    (2) For airplanes on which the special detailed inspection 
specified in AWL 53-61-153 of Bombardier TR 2B-2187, dated June 22, 
2011; or Canadair Regional Jet TR 2B-2109, dated October 13, 2005; 
has been done as of January 16, 2013 (the effective date of AD 2012-
25-02): The initial compliance time for AWL 53-61-153 is within 
4,360 flight cycles after accomplishing the most recent special 
detailed inspection, or within 1,500 flight cycles after 
accomplishing the most recent detailed inspection as specified in 
AWL 53-61-153 of Canadair Regional Jet TR 2B-2109, dated October 13, 
2005, whichever occurs later.

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

    This paragraph restates the requirements of paragraph (j) of AD 
2012-25-02, with a new exception. Except as required by paragraphs 
(j)(3), (l)(2), and (m) of this AD, after accomplishing the 
revisions required by paragraph (g) of this AD, no alternative 
actions (e.g., inspections) or intervals may be used other than 
those specified in Bombardier TR 2B-2187, dated June 22, 2011, to 
Appendix B-Airworthiness Limitations, of Part 2 of the Bombardier 
CL-600-2B19 MRM, unless the actions and intervals are approved as an 
alternative method of compliance (AMOC) in accordance with the 
procedures specified in paragraph (q)(1) of this AD.

(i) Retained General Revision of the MRM, With No Changes

    This paragraph restates the requirements of paragraph (k) of AD 
2012-25-02, with no changes. The maintenance program revision 
required by paragraph (g) of this AD may be done by inserting a copy 
of Bombardier TR 2B-2187, dated June 22, 2011, into Appendix B-
Airworthiness Limitations, of Part 2 of the Bombardier CL-600-2B19 
MRM. When this TR has been included in general revisions of the MRM, 
the general revisions may be inserted in the MRM, provided the 
relevant information in the general revision is identical to that in 
this TR.

(j) New Requirements of This AD: Inspections, Modification, and 
Maintenance or Inspection Program Revision

    Accomplish the actions required by paragraphs (j)(1), (j)(2), 
and (j)(3) of this AD at the time specified, except as provided by 
paragraphs (l) and (m) of this AD.
    (1) At the applicable time specified in figure 1 to paragraph 
(j) of this AD: Do a nondestructive inspection for cracking of the 
forward face of the fuselage station (FS) 621 pressure bulkhead, in 
accordance with AWL 53-61-153 of Bombardier TR 2B-2187, dated June 
22, 2011, to Appendix B--Airworthiness Limitations, of Part 2 of the 
Bombardier CL-600-2B19 MRM.
    (2) At the applicable time specified in figure 1 to paragraph 
(j) of this AD: Modify the RPB and do a nondestructive inspection 
for cracking of the FS 621 pressure bulkhead web, in accordance with 
Bombardier Repair Engineering Order (REO) 601R-53-61-1240, Revision 
D, dated October 31, 2016.
    (3) Before further flight after accomplishing the modification 
required by paragraph (j)(2) of this AD: Revise the existing 
maintenance or inspection program, as applicable, by incorporating 
the inspection requirements at the threshold and repetitive 
inspection times specified in the in-service deviation inspection 
requirements (SDIR) of Bombardier REO 601R-53-61-1240, Revision D, 
dated October 31, 2016.

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(k) Corrective Action

    (1) If any crack is found during any inspection required by 
paragraph (j)(2), (l)(1), or (m) of this AD: Before further flight, 
repair using a method approved by the Manager, New York ACO Branch, 
FAA; 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.
    (2) If any crack is found during any inspection required by 
paragraph (j)(1) of this AD: Before further flight, repair in 
accordance with the applicable service information specified in 
paragraph (k)(2)(i) or (k)(2)(ii) of this AD, or using a method 
approved by the Manager, New York ACO Branch, FAA; TCCA; or 
Bombardier, Inc.'s TCCA DAO. If approved by the DAO, the approval 
must include the DAO-authorized signature.
    (i) Bombardier REO 601R-53-61-1230, Revision F, dated October 
31, 2011; or Bombardier REO 601R-53-61-1285, Revision E, dated 
October 31, 2016.
    (ii) Bombardier REO 601R-53-61-1240, Revision D, dated October 
31, 2016; or Bombardier REO 601R-53-61-1541, Revision F, dated 
November 12, 2014.

(l) Alternative Actions for Certain Airplanes

    For airplanes on which the actions required by paragraphs (j)(1) 
and (j)(2) of this AD were performed before the effective date of 
this AD using the REOs identified in figure 2 to paragraph (l) of 
this AD: In lieu of accomplishing the actions required by paragraph 
(j) of this AD, accomplish the actions required by paragraphs (l)(1) 
and (l)(2) of this AD within 6,000 flight cycles after the effective 
date of this AD.
    (1) Perform a special detailed inspection for cracking of Zone B 
of the RPB web, in accordance with Part B of Bombardier REO 601R-53-
61-1240, Revision D, dated October 31, 2016.
    (2) Revise the existing maintenance or inspection program, as 
applicable, by incorporating the inspection requirements at the 
threshold and repetitive inspection times specified in Part B of the 
SDIR of Bombardier REO 601R-53-61-1240, Revision D, dated October 
31, 2016. The inspection threshold is measured from the time of 
incorporation of the applicable REO specified in figure 2 to 
paragraph (l) of this AD.
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(m) Alternative Actions for Airplane Serial Number 7610

    For airplane serial number 7610: In lieu of accomplishing the 
actions required by paragraph (j) of this AD; within 6,000 flight 
cycles after the effective date of this AD, do a reinforcement of 
K601R36010--A at left buttock line (LBL) 27.5 and perform a special 
detailed inspection for cracking of the FS 621 pressure bulkhead web 
at LBL 27.5, in accordance with Bombardier REO 601R-53-61-5828, 
Revision A, dated March 16, 2017. Before further flight after 
accomplishing the reinforcement, or within 60 days after the 
effective date of this AD, whichever occurs later: Revise the 
maintenance or inspection program, as applicable, by incorporating 
the inspection requirements that include threshold and repetitive 
inspection times as specified in the SDIR of Bombardier REO 601R-53-
61-5828, Revision A, dated March 16, 2017.

(n) No Alternative Actions or Intervals

    After the maintenance or inspection program has been revised as 
required by paragraph (j)(3), (l)(2), or (m) 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.

(o) Terminating Actions for Paragraph (g) of This AD

    (1) Accomplishment of the actions required by paragraph (j) or 
(l) of this AD terminates the requirements of paragraph (g) of this 
AD, for the repaired area only.
    (2) Accomplishment of the actions required by paragraph (m) of 
this AD terminates the requirements of paragraph (g) of this AD.
    (3) For airplanes on which the actions required by paragraph (j) 
or (l) of this AD have been done and on which the modification and 
inspection specified in REO 601R-53-61-1230, Revision F, dated 
October 31, 2011, have been done and there were no inspection 
findings: The actions required by paragraph (g) of this AD are 
terminated.

(p) Credit for Previous Actions

    (1) This paragraph provides credit for the actions required by 
paragraphs (k)(1) and (k)(2) of this AD, if those repairs were done 
before the effective date of this AD using a method approved by the 
Manager, New York ACO Branch, FAA; TCCA; or Bombardier, Inc.'s TCCA 
DAO; which references TCCA AD CF-2011-30, dated August 24, 2011, or 
AD CF-2011-30R1, dated November 1, 2016.
    (2) This paragraph provides credit for the actions required by 
paragraph (k)(2) of this AD, if those actions were performed before 
the effective date of this AD using the service information 
specified in paragraph (p)(2)(i), (p)(2)(ii), (p)(2)(iii), 
(p)(2)(iv), (p)(2)(v), or (p)(2)(vi) of this AD, provided that the 
maintenance or inspection program is revised by incorporating the 
inspection requirements at the threshold and repetitive inspection 
times specified in the SDIR of Bombardier REO 601R-53-61-1230, 
Revision F, dated November 7, 2011.

[[Page 26556]]

    (i) Bombardier REO 601R-53-61-1230, dated February 10, 2005.
    (ii) Bombardier REO 601R-53-61-1230, Revision A, dated November 
6, 2009.
    (iii) Bombardier REO 601R-53-61-1230, Revision B, dated October 
5, 2005.
    (iv) Bombardier REO 601R-53-61-1230, Revision C, dated November 
10, 2005.
    (v) Bombardier REO 601R-53-61-1230, Revision D, dated July 19, 
2006.
    (vi) Bombardier REO 601R-53-61-1230, Revision E, dated August 
18, 2011.
    (3) This paragraph provides credit for the actions required by 
paragraph (k)(2) of this AD, if those actions were performed before 
the effective date of this AD using the service information 
specified in paragraph (p)(3)(i), (p)(3)(ii), (p)(3)(iii), 
(p)(3)(iv), or (p)(3)(v) of this AD, provided that the maintenance 
or inspection program is revised by incorporating the inspection 
requirements at the threshold and repetitive inspection times 
specified in the SDIR of Bombardier REO 601R-53-61-1285, Revision E, 
date October 31, 2016.
    (i) Bombardier REO 601R-53-61-1285, dated March 24, 2005.
    (ii) Bombardier REO 601R-53-61-1285, Revision A, dated November 
6, 2009.
    (iii) Bombardier REO 601R-53-61-1285, Revision B, dated April 
14, 2010.
    (iv) Bombardier REO 601R-53-61-1285, Revision C, dated August 
19, 2011.
    (v) Bombardier REO 601R-53-61-1285, Revision D, dated October 
31, 2011.
    (4) This paragraph provides credit for the actions required by 
paragraph (k)(2) of this AD if those actions were performed before 
the effective date of this AD using the service information 
specified in paragraph (p)(4)(i), (p)(4)(ii), (p)(4)(iii), 
(p)(4)(iv), (p)(4)(v), or (p)(4)(vi) of this AD, provided that the 
maintenance or inspection program is revised by incorporating the 
inspection requirements at the threshold and repetitive inspection 
times specified in the SDIR of Bombardier REO 601R-53-61-1541, 
Revision F, dated November 12, 2014.
    (i) Bombardier REO 601R-53-61-1541, dated November 27, 2005.
    (ii) Bombardier REO 601R-53-61-1541, Revision A, dated February 
8, 2008.
    (iii) Bombardier REO 601R-53-61-1541, Revision B, dated March 
16, 2009.
    (iv) Bombardier REO 601R-53-61-1541, Revision C, dated August 
19, 2011.
    (v) Bombardier REO 601R-53-61-1541, Revision D, dated October 
31, 2011.
    (vi) Bombardier REO 601R-53-61-1541, Revision E, dated November 
5, 2013.
    (5) This paragraph provides credit for the actions required by 
paragraph (m) of this AD, if those actions were performed before the 
effective date of this AD using Bombardier REO 601R-53-61-5828, 
dated November 1, 2016, provided that the maintenance or inspection 
program is revised by incorporating the inspection requirements at 
the threshold and repetitive inspection times specified in the SDIR 
of Bombardier REO 601R-53-61-5828, Revision A, dated March 16, 2017.

(q) 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, New York 11590; telephone: 516-228-7300; fax: 516-794-
5531.
    (i) 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.
    (ii) AMOCs approved previously for AD 2012-25-02 are approved as 
AMOCs for the corresponding provisions in paragraphs (g), (h), and 
(i) of this AD.
    (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.

(r) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian Airworthiness Directive CF-2011-30R2, dated June 12, 
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-2018-0794.
    (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 (s)(5) and (s)(6) of this AD.

(s) 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 12, 2019.
    (i) Bombardier Repair Engineering Order 601R-53-61-1230, 
Revision F, dated October 31, 2011.
    (ii) Bombardier Repair Engineering Order 601R-53-61-1240, 
Revision D, dated October 31, 2016.
    (iii) Bombardier Repair Engineering Order 601R-53-61-1285, 
Revision E, dated October 31, 2016.
    (iv) Bombardier Repair Engineering Order 601R-53-61-1541, 
Revision F, dated November 12, 2014.
    (v) Bombardier Repair Engineering Order 601R-53-61-5828, 
Revision A, dated March 16, 2017.
    (4) The following service information was approved for IBR on 
January 16, 2013 (77 FR 73902, December 12, 2012).
    (i) Bombardier Temporary Revision 2B-2187, dated June 22, 2011, 
to Appendix B-Airworthiness Limitations, of Part 2 of the Bombardier 
CL-600-2B19 Maintenance Requirements Manual.
    (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 514-855-5000; 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 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 April 19, 2019,
Michael Kaszycki,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2019-11956 Filed 6-6-19; 8:45 am]
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