[Federal Register Volume 83, Number 101 (Thursday, May 24, 2018)]
[Rules and Regulations]
[Pages 24012-24016]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-09863]


=======================================================================
-----------------------------------------------------------------------

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0530; Product Identifier 2017-NM-012-AD; Amendment 
39-19271; AD 2018-09-14]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc., Airplanes

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

ACTION: Final rule.

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

SUMMARY: We are superseding Airworthiness Directive (AD) 2016-11-02, 
which applied to all Bombardier, Inc., Model CL-600-2C10 (Regional Jet 
Series 700, 701, & 702) airplanes; Model CL-600-2D15 (Regional Jet 
Series 705) airplanes; Model CL-600-2D24 (Regional Jet Series 900) 
airplanes; and Model CL-600-2E25 (Regional Jet Series 1000) airplanes. 
AD 2016-11-02 required repetitive inspections of the upper and lower 
engine pylons for protruding, loose, or missing fasteners; and repair 
if necessary. This AD continues to require the repetitive inspections 
of the upper and lower engine pylons for protruding, loose, or missing 
fasteners; and repair if necessary. This AD also requires replacement 
of affected fasteners, which terminates the inspections. This AD was 
prompted by reports of loose or missing fasteners and collars on the 
upper and lower engine pylon structure common to the upper and lower 
pylon skin panels and engine thrust fitting. We are issuing this AD to 
address the unsafe condition on these products.

DATES: This AD is effective June 28, 2018.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of June 28, 
2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain other publications listed in this AD as of June 
10, 2016 (81 FR 33371, May 26, 2016).

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; telephone 514-855-5000; fax 514 855-
7401; email [email protected]; internet http://www.bombardier.com. You may view this referenced service information at 
the FAA, Transport Standards Branch, 2200 South 216th Street, 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-2017-
0530.

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-2017-
0530; or in person at the Docket Management Facility between 9 a.m. and 
5 p.m., Monday through Friday, except Federal holidays. The AD docket 
contains this AD, the regulatory evaluation, any comments received, and 
other information. The address for the Docket Office (telephone 800-
647-5527) is Docket Management Facility, 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 2016-11-02, Amendment 39-18529 (81 FR 33371, 
May 26, 2016) (``AD 2016-11-02''). AD 2016-11-02 applied to all 
Bombardier, Inc., Model CL-600-2C10 (Regional Jet Series 700, 701, & 
702) airplanes; Model CL-600-2D15 (Regional Jet Series 705) airplanes; 
Model CL-600-2D24 (Regional Jet Series 900) airplanes; and Model CL-
600-2E25 (Regional Jet Series 1000) airplanes. The NPRM published in 
the Federal Register on June 12, 2017 (82 FR 26864). The NPRM was 
prompted by reports of loose or missing fasteners and collars on the 
upper and lower engine pylon structure common to the upper and lower 
pylon skin panels and engine thrust fitting. The NPRM proposed to 
continue to require the repetitive inspections of the upper and lower 
engine pylons for protruding, loose, or missing fasteners; and repair 
if necessary. The NPRM also proposed to require replacement of affected 
fasteners, which terminates the inspections. We are issuing this AD to 
prevent protruding, loose, or missing fasteners, which could result in 
structural failure of the engine pylons.
    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority

[[Page 24013]]

for Canada, has issued Canadian Airworthiness Directive CF-2016-10R1, 
dated July 8, 2016 (referred to after this as the Mandatory Continuing 
Airworthiness Information, or ``the MCAI''), to correct an unsafe 
condition for all Bombardier, Inc., Model CL-600-2C10 (Regional Jet 
Series 700, 701, & 702) airplanes; Model CL-600-2D15 (Regional Jet 
Series 705) airplanes; Model CL-600-2D24 (Regional Jet Series 900) 
airplanes; and Model CL-600-2E25 (Regional Jet Series 1000) airplanes. 
The MCAI states:

    There have been several reported findings of loose or missing 
Hi-Lite fasteners and collars on the left hand (L/H) and right hand 
(R/H) upper and lower engine pylon structure common to the upper and 
lower pylon skin panels and engine thrust fitting. Missing fasteners 
in these areas are shown to significantly reduce the safety margins 
and could result in a structural failure of the engine pylon.
    Bombardier, as an interim corrective action issued a new 
Aircraft Maintenance Manual (AMM) task for detailed inspection of 
the engine pylon rib and skin fasteners to inspect for protruding, 
loose or missing fasteners and rectify any discrepancies noted in 
accordance with a Repair Engineering Order (REO). The original 
version of this [Canadian] AD, CF-2016-10, mandated the subject 
inspection and necessary rectification.
    Bombardier has since issued Service Bulletin (SB) 670BA-54-007 
to replace all affected fasteners with interference fit fasteners 
[including applicable related investigative and corrective actions], 
as terminating action for the mandated inspection requirement. 
[Canadian] AD CF-2016-10 is now being revised to mandate compliance 
with SB 670BA-54-007.

    Related investigative actions include measurements of the attach 
holes in the engine pylon upper structure and special detailed visual 
inspections for cracks in the engine pylon structure. Corrective 
actions include repair. 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-2017-0530.
    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-2017-
0530.

Comments

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

Request To Include Additional Service Information in Credit Paragraph

    Mesa Airlines suggested that Bombardier Service Bulletin 670BA-54-
007, dated May 13, 2016, be included in paragraph (l), ``Credit for 
Previous Actions,'' of the proposed AD. The commenter did not provide 
justification for its request. We infer that the commenter made this 
request to provide credit for operators that completed the actions in 
Bombardier Service Bulletin 670BA-54-007, dated May 13, 2016, prior to 
the effective date of the proposed AD.
    We do not agree that the commenter's requested change is needed. 
Paragraph (f) of this AD states that the actions specified in this AD 
must be accomplished ``unless already done.'' The phrase ``unless 
already done'' provides credit for accomplishment of the actions 
required by paragraph (j) of this AD, if done in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-54-
007, dated May 13, 2016, prior to the effective date of this AD. 
Therefore, we have not changed this AD in this regard.

Request To Revise Paragraph (g) of the Proposed AD To Require Airplane 
Maintenance Manual Task

    Bombardier requested that Task 54-51-01-220-801, ``Detailed 
Inspection of the Engine Pylon Rib and Skin Fasteners,'' to Chapter 54, 
``Nacelle/Pylons,'' to Part 2 of the Bombardier CRJ700/900/1000 
Aircraft Maintenance Manual (AMM), be required by paragraph (g) of the 
proposed AD in lieu of Bombardier Temporary Revision (TR) 54-0007, 
dated March 8, 2016, to the CRJ700/900/1000 AMM. The commenter stated 
that Bombardier TR 54-0007 was incorporated into Revision 52 of the 
Bombardier CRJ700/900/1000 AMM, and that the AMM is currently at 
Revision 56.
    We partially agree with the commenter's request. We agree to 
include Task 54-51-01-220-801, ``Detailed Inspection of the Engine 
Pylon Rib and Skin Fasteners,'' to Chapter 54, ``Nacelle/Pylons,'' to 
Part 2 of the Bombardier CRJ700/900/1000 AMM as a method of compliance 
in paragraph (g) of this AD, but we do not agree to remove Bombardier 
TR 54-0007, dated March 8, 2016, to the Bombardier CRJ700/900/1000 AMM. 
We have revised paragraph (g) of this AD to include both Task 54-51-01-
220-801, ``Detailed Inspection of the Engine Pylon Rib and Skin 
Fasteners,'' to Chapter 54, ``Nacelle/Pylons,'' to Part 2 of the 
Bombardier CRJ700/900/1000 AMM, CSP B-001, Revision 56, dated September 
25, 2017; and Bombardier TR 54-0007, dated March 8, 2016. This revision 
provides operators with an option to use either service document to 
accomplish the required action.

Conclusion

    We reviewed the available data, including the comments received, 
and determined that air safety and the public interest require adopting 
this AD with the changes described previously and minor editorial 
changes. We have determined that these changes:
     Are consistent with the intent that was proposed in the 
NPRM for correcting 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 AD.

Related Service Information Under 1 CFR Part 51

    Bombardier, Inc., issued Service Bulletin 670BA-54-007, dated May 
13, 2016. This service information describes procedures for replacing 
fasteners and collars, including applicable related investigative and 
corrective actions.
    Bombardier, Inc., also issued Repair Engineering Order 670-54-51-
034, ``Repair for Missing or Loose/Protruding Fasteners in Upper and 
Lower Pylon Skins FS 1088--FS 1098, PBL 69.3 L & RHS,'' Revision A, 
dated April 20, 2016. This service information describes procedures for 
repair, including applicable related investigative and corrective 
actions.
    In addition, Bombardier, Inc., issued TR 54-0007, dated March 8, 
2016, to the CRJ700/900/1000 AMM; and Task 54-51-01-220-801, ``Detailed 
Inspection of the Engine Pylon Rib and Skin Fasteners,'' to Chapter 54, 
``Nacelle/Pylons,'' to Part 2 of the Bombardier CRJ700/900/1000 AMM, 
CSP B-001, Revision 56, dated September 25, 2017. This service 
information describes procedures for a detailed visual inspection for 
protruding, loose, or missing fasteners of the left-hand and right-hand 
upper and lower engine pylons. The content of these documents is nearly 
identical, except for labels on the figures; we have chosen to 
incorporate both documents by reference so that either may be used to 
comply with certain requirements of this AD.
    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 273 airplanes of U.S. registry.
    We estimate the following costs to comply with this AD:

[[Page 24014]]



                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                                 Cost on U.S.
             Action                     Labor cost          Parts cost     Cost per product        operators
----------------------------------------------------------------------------------------------------------------
Inspection (retained from AD     1 work-hour x $85 per                $0  $85 per inspection  $23,205 per
 2016-11-02).                     hour = $85 per                           cycle.              inspection cycle.
                                  inspection cycle.
Replacement (new action).......  43 work-hours x $85 per           1,808  $5,463 per          $1,491,399 per
                                  hour = $3,655 per                        inspection cycle.   inspection cycle.
                                  inspection cycle.
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary repairs that 
will be required based on the results of the inspection. We have no way 
of determining the number of aircraft that might need these repairs:

                                               On-Condition Costs
----------------------------------------------------------------------------------------------------------------
               Action                          Labor cost             Parts cost          Cost per product
----------------------------------------------------------------------------------------------------------------
Repair (retained from AD 2016-11-02)  Up to 32 work-hours x $85              (\1\)  Up to $2,720.
                                       per hour = $2,720.
----------------------------------------------------------------------------------------------------------------
\1\ We have received no definitive data that will enable us to provide cost estimates for the parts cost
  specified in this AD for the on-condition repairs.

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 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) 
2016-11-02, Amendment 39-18529 (81 FR 33371, May 26, 2016), and adding 
the following new AD:

2018-09-14 Bombardier, Inc.: Amendment 39-19271; Docket No. FAA-
2017-0530; Product Identifier 2017-NM-012-AD.

(a) Effective Date

    This AD is effective June 28, 2018.

(b) Affected ADs

    This AD replaces AD 2016-11-02, Amendment 39-18529 (81 FR 33371, 
May 26, 2016) (``AD 2016-11-02'').

(c) Applicability

    This AD applies to the airplanes identified in paragraphs (c)(1) 
through (c)(4) of this AD, certificated in any category.
    (1) Bombardier, Inc., Model CL-600-2C10 (Regional Jet Series 
700, 701, & 702) airplanes, serial numbers (S/Ns) 10002 through 
10344 inclusive.
    (2) Bombardier, Inc., Model CL-600-2D15 (Regional Jet Series 
705) airplanes, S/Ns 15001 through 15388 inclusive, 15391, 15392, 
and 15395.
    (3) Bombardier, Inc., Model CL-600-2D24 (Regional Jet Series 
900) airplanes, S/Ns 15001 through 15388 inclusive, 15391, 15392, 
and 15395.
    (4) Bombardier, Inc., Model CL-600-2E25 (Regional Jet Series 
1000) airplanes, S/Ns 19001 through 19044 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 54, Nacelles/
Pylons.

(e) Reason

    This AD was prompted by reports of loose or missing fasteners 
and collars on the upper and lower engine pylon structure common to 
the upper and lower pylon skin panels and engine thrust fitting. We 
are issuing this AD to prevent protruding, loose, or missing 
fasteners, which could result in structural failure of the engine 
pylons.

(f) Compliance

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

[[Page 24015]]

(g) Retained Inspection, With a Reference To Terminating Action and 
Additional Service Information

    This paragraph restates the requirements of paragraph (g) of AD 
2016-11-02, with a reference to new terminating action and 
additional service information. At the applicable time specified in 
paragraph (g)(1) or (g)(2) of this AD: Do a detailed visual 
inspection for protruding, loose, or missing fasteners of the upper 
and lower engine pylons, in accordance with Bombardier Temporary 
Revision 54-0007, dated March 8, 2016, to the CRJ700/900/1000 
Aircraft Maintenance Manual; or Task 54-51-01-220-801, ``Detailed 
Inspection of the Engine Pylon Rib and Skin Fasteners,'' to Chapter 
54, ``Nacelle/Pylons,'' to Part 2 of the Bombardier CRJ700/900/1000 
Aircraft Maintenance Manual, CSP B-001, Revision 56, dated September 
25, 2017. Repeat the inspection thereafter at intervals not to 
exceed 1,500 flight hours. Accomplishment of the replacement 
required by paragraph (j) of this AD is terminating action for the 
inspections required by this paragraph.
    (1) For airplanes that have accumulated more than 840 total 
flight hours as of June 10, 2016 (the effective date of AD 2016-11-
02): Inspect within 660 flight hours or 3 months, whichever occurs 
first, after June 10, 2016.
    (2) For airplanes that have accumulated 840 total flight hours 
or less as of June 10, 2016 (the effective date of AD 2016-11-02): 
Inspect before the accumulation of 1,500 total flight hours.

(h) Retained Repair, With New Service Information and Contact 
Information

    This paragraph restates the requirements of paragraph (h) of AD 
2016-11-02, with new service information and contact information. If 
any protruding, loose, or missing fastener is found during any 
inspection required by paragraph (g) of this AD, before further 
flight, repair, including applicable related investigative and 
corrective actions, in accordance with Bombardier Repair Engineering 
Order (REO) 670-54-51-034, ``Repair for Missing or Loose/Protruding 
Fasteners in Upper and Lower Pylon Skins FS 1088-FS 1098, PBL 69.3 L 
& RHS,'' dated March 7, 2016, or Revision A, dated April 20, 2016; 
except where Bombardier REO 670-54-51-034, ``Repair for Missing or 
Loose/Protruding Fasteners in Upper and Lower Pylon Skins FS 1088-FS 
1098, PBL 69.3 L & RHS,'' dated March 7, 2016, or Revision A, dated 
April 20, 2016; specifies to contact Bombardier for further 
instruction, before further flight, repair using a method approved 
by the Manager, FAA, New York ACO Branch; or Transport Canada Civil 
Aviation (TCCA); or Bombardier, Inc.'s TCCA Design Approval 
Organization (DAO). As of the effective date of this AD, use 
Bombardier REO 670-54-51-034, ``Repair for Missing or Loose/
Protruding Fasteners in Upper and Lower Pylon Skins FS 1088-FS 1098, 
PBL 69.3 L & RHS,'' Revision A, dated April 20, 2016, for the 
actions required by this paragraph.

(i) Retained Credit for Previous Actions, With No Changes

    This paragraph restates paragraph (i) of AD 2016-11-02, with no 
changes. This paragraph provides credit only for the initial 
inspection specified in paragraph (g) of this AD, if that action was 
performed before June 10, 2016 (the effective date of AD 2016-11-02) 
using Bombardier Reference Instruction Letter 4212, dated December 
23, 2015; or Bombardier Reference Instruction Letter 4212A, Revision 
A, dated January 28, 2016. These documents are not incorporated by 
reference in this AD.

(j) New Requirements of This AD: Fastener and Collar Replacement

    Within 12,600 flight hours or 72 months after the effective date 
of this AD, whichever occurs first: Replace affected fasteners and 
collars, including doing all applicable related investigative and 
corrective actions, in accordance with the Accomplishment 
Instructions of Bombardier Service Bulletin 670BA-54-007, dated May 
13, 2016. Where Bombardier Service Bulletin 670BA-54-007, dated May 
13, 2016, specifies to contact Bombardier for appropriate action: 
Before further flight, accomplish the applicable corrective action 
in accordance with the procedures specified in paragraph (m)(2) of 
this AD.

(k) Terminating Action for the Introductory Text of Paragraph (g) of 
This AD

    Accomplishing the replacement required by paragraph (j) of this 
AD constitutes terminating action for the inspections required by 
the introductory text of paragraph (g) of this AD.

(l) Credit for Previous Actions

    (1) This paragraph provides credit for the actions specified in 
paragraph (h) of this AD, if those actions were performed before the 
effective date of this AD using Bombardier REO 670-54-51-034, 
``Repair for Missing or Loose/Protruding Fasteners in Upper and 
Lower Pylon Skins FS 1088-FS 1098, PBL 69.3 L & RHS,'' dated March 
7, 2016. This document was incorporated by reference in AD 2016-11-
02.
    (2) This paragraph provides credit for the actions specified in 
paragraph (j) of this AD, if those actions were performed before the 
effective date of this AD using Bombardier REO 670-54-51-035, 
``Permanent Repair for Clearance Fit Installed (-8) Size Fasteners 
in Upper and Lower Pylon Skins FS 1088--FS 1098, PBL 69.3 L & RHS & 
Terminating Action for GREO 670-54-51-034,'' dated April 20, 2016. 
This document is not incorporated by reference in this AD.

(m) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, FAA, 
New York ACO Branch, 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.
    (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 2016-11-02 are acceptable 
for the corresponding provisions 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, FAA, New York 
ACO Branch; or TCCA; or Bombardier, Inc.'s TCCA DAO. If approved by 
the DAO, the approval must include the DAO-authorized signature.

(n) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian AD CF-2016-10R1, dated July 8, 2016, 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-2017-0530.
    (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 (o)(5) and (o)(6) of this AD.

(o) 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 
June 28, 2018.
    (i) Bombardier Repair Engineering Order 670-54-51-034, ``Repair 
for Missing or Loose/Protruding Fasteners in Upper and Lower Pylon 
Skins FS 1088--FS 1098, PBL 69.3 L & RHS,'' Revision A, dated April 
20, 2016.
    (ii) Bombardier Service Bulletin 670BA-54-007, dated May 13, 
2016.
    (iii) Task 54-51-01-220-801, ``Detailed Inspection of the Engine 
Pylon Rib and Skin Fasteners,'' to Chapter 54, ``Nacelle/Pylons,'' 
to Part 2 of the Bombardier CRJ700/900/1000 Aircraft Maintenance 
Manual, CSP B-001, Revision 56, dated September 25, 2017.
    (4) The following service information was approved for IBR on 
June 10, 2016 (81 FR 33371, May 26, 2016).
    (i) Bombardier Temporary Revision 54-0007, dated March 8, 2016, 
to the CRJ700/900/1000 Aircraft Maintenance Manual.
    (ii) Reserved.
    (5) For service information identified in this AD, contact 
Bombardier, Inc., 400 C[ocirc]te

[[Page 24016]]

Vertu Road West, Dorval, Qu[eacute]bec H4S 1Y9, Canada; telephone 
514-855-5000; fax 514 855-7401; email [email protected]; 
internet http://www.bombardier.com.
    (6) You may view this service information at the FAA, Transport 
Standards Branch, 2200 South 216th Street, 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 27, 2018.
Michael Kaszycki,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2018-09863 Filed 5-23-18; 8:45 am]
 BILLING CODE 4910-13-P


