[Federal Register Volume 83, Number 92 (Friday, May 11, 2018)]
[Rules and Regulations]
[Pages 21855-21858]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2018-09734]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0775; Product Identifier 2017-NM-048-AD; Amendment 
39-19272; AD 2018-09-15]
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) 2016-25-18, 
which applied to certain Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes. AD 2016-25-18 required an inspection for 
discrepancies of the attachment points of the links between the engine 
rear mount assemblies, and corrective actions if necessary. This AD 
requires an inspection of certain attachment points, corrective action 
if necessary, and replacement of certain bolts and nuts in the engine 
rear mount assemblies. This AD also adds airplanes to the 
applicability. This AD was prompted by the determination that 
replacement of certain nuts and bolts in the engine rear mount 
assemblies is necessary. We are issuing this AD to address the unsafe 
condition on these products.

DATES: This AD is effective June 15, 2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of June 15, 
2018.
    The Director of the Federal Register approved the incorporation by 
reference of certain other publications listed in this AD as of January 
3, 2017 (81 FR 90961, December 16, 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-
0775.

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-
0775; 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 2016-25-18, Amendment 39-18744 (81 FR 90961,

[[Page 21856]]

December 16, 2016) (``AD 2016-25-18''). AD 2016-25-18 applied to 
certain Bombardier, Inc., Model BD-700-1A10 and BD-700-1A11 airplanes. 
The NPRM published in the Federal Register on August 15, 2017 (82 FR 
38626). The NPRM was prompted by the determination that replacement of 
certain nuts and bolts in the engine rear mount assemblies is 
necessary. The NPRM proposed to continue to require an inspection for 
discrepancies of the attachment points of the links between the engine 
rear mount assemblies, and corrective actions if necessary. The NPRM 
also proposed to require an inspection of certain attachment points, 
corrective action if necessary, and replacement of certain bolts and 
nuts in the engine rear mount assemblies. The NPRM also proposed to add 
airplanes to the applicability. We are issuing this AD to detect and 
correct broken engine attachment hardware, which could result in 
separation of an engine from the airplane.
    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian AD CF-2016-23R1, dated 
February 20, 2017 (referred to after this as the Mandatory Continuing 
Airworthiness Information, or ``the MCAI''), to correct an unsafe 
condition for certain Bombardier, Inc., Model BD-700-1A10 and BD-700-
1A11 airplanes. The MCAI states:

    Bombardier reported that during maintenance of a BD-700 
aeroplane, the engine mount pin, part number (P/N) BRR15838, was 
found backed out of the rear mount link. The retaining bolt, P/N 
AS54020, which passes through the engine mount pin was also found 
fractured at the groove which holds the locking spring. An 
investigation revealed the most probable root cause of failure to be 
a single axial tension static overload, with no evidence of fatigue 
contributing to the failure.
    The above condition if not detected, may result in the loss of 
engine attachment to the airframe.
    As an interim corrective action, Bombardier issued Service 
Bulletins (SBs) 700-71-002, 700-71-6002, 700-71-5002, and 700-1A11-
71-002 to inspect the attachment points of the links between the 
engine rear mount assemblies, and install replacement hardware if 
required.
    The original version of this [Canadian] AD was issued to mandate 
incorporation of the above Bombardier SBs to inspect and maintain 
integrity of the affected engine rear mount assembly.
    Revision 1 of this [Canadian] AD is issued to mandate 
incorporation of the Bombardier SBs 700-71-003, 700-71-6003, 700-71-
5003, and 700-1A11-71-003 to replace the existing bolts and self-
locking nuts with new bolts and nuts, as a final corrective action.

    The MCAI also adds airplanes having serial numbers 9764, 9766, and 
9771 through 9785 inclusive to the applicability. Those airplanes are 
also affected by the identified unsafe condition. 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-2017-0775.

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.

Requests To Provide Credit for Actions Previously Accomplished

    NetJets Aviation requested that we provide credit for accomplishing 
the actions specified in paragraphs (j) and (k) of the proposed AD 
prior to the effective date of this AD. Bombardier requested that we 
provide credit for accomplishing the actions specified in paragraphs 
(k) and (l) of the proposed AD prior to the effective date of this AD.
    We acknowledge the commenters' requests and agree to clarify. 
Paragraph (f) of this AD states to accomplish the required actions 
within the compliance times specified, ``unless already done.'' 
Therefore, if operators have accomplished the actions required for 
compliance with this AD before the effective date of this AD, no 
further action is necessary. We have not revised this AD in this 
regard.

Conclusion

    We reviewed the available data, including the comments received, 
and determined that air safety and the public interest require adopting 
this AD as proposed except for minor editorial changes. We have 
determined that these minor 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.

Related Service Information Under 1 CFR Part 51

    Bombardier, Inc. has issued the following service information. This 
service information describes procedures for an inspection for 
discrepancies of the attachment points of the links between the engine 
rear mount assemblies and corrective actions. These documents are 
distinct since they apply to different airplane models and serial 
numbers.
     Bombardier Service Bulletin 700-1A11-71-002, Revision 01, 
dated June 30, 2016.
     Bombardier Service Bulletin 700-71-002, Revision 01, dated 
June 30, 2016.
     Bombardier Service Bulletin 700-71-5002, Revision 01, 
dated June 30, 2016.
     Bombardier Service Bulletin 700-71-6002, Revision 01, 
dated June 30, 2016.
    Bombardier, Inc. has also issued the following service information. 
This service information describes procedures for nut and bolt 
replacements. These documents are distinct since they apply to 
different airplane models and serial numbers.
     Bombardier Service Bulletin 700-1A11-71-003, dated 
December 5, 2016.
     Bombardier Service Bulletin 700-71-003, dated December 5, 
2016.
     Bombardier Service Bulletin 700-71-5003, dated December 5, 
2016.
     Bombardier Service Bulletin 700-71-6003, dated December 5, 
2016.
    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 97 airplanes of U.S. registry.
    The actions required by AD 2016-25-18, and retained in this AD take 
about 1 work-hour per product, at an average labor rate of $85 per 
work-hour. Based on these figures, the estimated cost of the actions 
that are required by AD 2016-25-18 is $85 per product.
    The retained on-condition costs in this AD take about 2 work-hours 
per product, at an average labor rate of $85 per work-hour. Required 
parts cost about $730 per product. Based on these figures, the 
estimated cost of the on-condition actions that are required by AD 
2016-25-18 is $900 per product.
    We have received no definitive data that would enable us to provide 
cost estimates for other retained on-condition actions specified in AD 
2016-25-18.
    We also estimate that it will take about 4 work-hours per product 
to comply with the basic requirements of this AD. The average labor 
rate is $85 per work-hour. Required parts will cost up to $14,940 per 
product. Based on these figures, we estimate the cost of this AD on 
U.S. operators to be up to $1,482,160, or up to $15,280 per product.
    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 of the costs of this AD may be 
covered

[[Page 21857]]

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 available 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 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) 
2016-25-18, Amendment 39-18744 (81 FR 90961, December 16, 2016), and 
adding the following new AD:

2018-09-15 Bombardier, Inc.: Amendment 39-19272; Docket No. FAA-
2017-0775; Product Identifier 2017-NM-048-AD.

(a) Effective Date

    This AD is effective June 15, 2018.

(b) Affected ADs

    This AD replaces AD 2016-25-18, Amendment 39-18744 (81 FR 90961, 
December 16, 2016) (``AD 2016-25-18'').

(c) Applicability

    This AD applies to Bombardier, Inc., Model BD-700-1A10 and BD-
700-1A11 airplanes, certificated in any category, serial numbers (S/
Ns) 9002 through 9785 inclusive, and 9998.

(d) Subject

    Air Transport Association (ATA) of America Code 72, Engine.

(e) Reason

    This AD was prompted by a report indicating that during 
maintenance, an engine mount pin was found backed out of the rear 
mount link, and the associated retaining bolt was also found 
fractured at the groove that holds the locking spring, and a 
determination that replacement of certain nuts and bolts in the 
engine rear mount assemblies is necessary. We are issuing this AD to 
detect and correct broken engine attachment hardware, which could 
result in separation of an engine from the airplane.

(f) Compliance

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

(g) Retained Inspection, With No Changes

    This paragraph restates the requirements of paragraph (g) of AD 
2016-25-18, with no changes. For airplanes having S/Ns 9002 through 
9763 inclusive, 9765, 9767 through 9770 inclusive, and 9998: Within 
500 flight hours or 4 months, whichever occurs first after January 
3, 2017 (the effective date of AD 2016-25-18), do an inspection for 
discrepancies of the engine rear mount assemblies (including missing 
or broken bolts, missing nuts, incorrect torque values, and an 
incorrect gap between the bushing and washer); in accordance with 
Part A of the Accomplishment Instructions of the applicable service 
information specified in paragraphs (g)(1) through (g)(4) of this 
AD. Accomplishing the actions required by paragraphs (j) and (k) of 
this AD terminates the requirements of this paragraph.
    (1) Bombardier Service Bulletin 700-1A11-71-002, Revision 01, 
dated June 30, 2016 (for Bombardier Model BD-700-1A11 airplanes).
    (2) Bombardier Service Bulletin 700-71-002, Revision 01, dated 
June 30, 2016 (for Bombardier Model BD-700-1A10 airplanes).
    (3) Bombardier Service Bulletin 700-71-5002, Revision 01, dated 
June 30, 2016 (for Bombardier Model BD-700-1A11 airplanes).
    (4) Bombardier Service Bulletin 700-71-6002, Revision 01, dated 
June 30, 2016 (for Bombardier Model BD-700-1A10 airplanes).

(h) Retained Corrective Action for Paragraph (g) of This AD, With No 
Changes

    This paragraph restates the requirements of paragraph (h) of AD 
2016-25-18, with no changes. If any discrepancy is detected during 
the inspection required by paragraph (g) of this AD, before further 
flight, replace missing parts and correct noncompliant gaps and bolt 
torque, as specified in the Accomplishment Instructions of the 
applicable service information specified in paragraphs (g)(1) 
through (g)(4) of this AD, except as required by paragraph (i) of 
this AD. Accomplishing the actions required by paragraphs (j) and 
(k) of this AD terminates the requirements of this paragraph.

(i) Retained Exception to Service Information Specifications, With No 
Changes

    This paragraph restates the requirements of paragraph (i) of AD 
2016-25-18, with no changes. Where the applicable Bombardier service 
bulletin specified in paragraphs (g)(1) through (g)(4) of this AD 
provides no instructions for corrective actions, or specifies to 
contact Bombardier for appropriate action, accomplish corrective 
actions in accordance with the procedures specified in paragraph 
(o)(2) of this AD.

(j) New Requirement of This AD: Gap Measurement

    Within 1,000 flight hours or 12 months, whichever occurs first 
after the effective date of this AD: Measure the gaps between the 
applicable shouldered bushing fitted on the mount beam and the 
washer; and between the applicable engine ring lug and the head of 
the mount pin to determine if the gaps are within acceptable limits; 
in accordance with Part A of the Accomplishment Instructions of the 
applicable service information specified in paragraphs (j)(1) 
through (j)(4) of this AD. Accomplishing the actions required by 
paragraphs (j) and (k) of this AD terminates the requirements of 
paragraphs (g) and (h) of this AD.
    (1) Bombardier Service Bulletin 700-1A11-71-003, dated December 
5, 2016 (for Bombardier Model BD-700-1A11 airplanes).

[[Page 21858]]

    (2) Bombardier Service Bulletin 700-71-003, dated December 5, 
2016 (for Bombardier Model BD-700-1A10 airplanes).
    (3) Bombardier Service Bulletin 700-71-5003, dated December 5, 
2016 (for Bombardier Model BD-700-1A11 airplanes).
    (4) Bombardier Service Bulletin 700-71-6003, dated December 5, 
2016 (for Bombardier Model BD-700-1A10 airplanes).

(k) New Requirement of This AD: Nut and Bolt Replacements, and Gap 
Measurement

    Within 1,000 flight hours or 12 months, whichever occurs first 
after the effective date of this AD: Replace the nuts having part 
number (P/N) AS54365 and the bolts having P/N AS54020 and AS54002 in 
the engine rear mount assembly with new nuts and new bolts; and do 
the gap measurement to determine if the gap is within acceptable 
limits; in accordance with Part B of the Accomplishment Instructions 
of the applicable service information specified in paragraphs (j)(1) 
through (j)(4) of this AD.

(l) New Requirement of This AD: Corrective Action

    If any gap is detected, during any measurement required by 
paragraph (j) or (k) of this AD, that is not within the applicable 
limits specified in the service information specified in paragraphs 
(j)(1) through (j)(4) of this AD, before further flight repair 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.

(m) No Reporting Required

    Although the service information identified in paragraphs (j)(1) 
through (j)(4) of this AD specifies to submit certain information to 
the manufacturer, this AD does not include that requirement.

(n) Credit for Previous Actions

    This paragraph provides credit for actions required by 
paragraphs (g) and (h) of this AD, if those actions were performed 
before January 3, 2017 (the effective date of AD 2016-25-18), in 
accordance with the Accomplishment Instructions of the applicable 
service information specified in paragraphs (n)(1) through (n)(4) of 
this AD.
    (1) Bombardier Service Bulletin 700-1A11-71-002, dated May 31, 
2016 (for Bombardier Model BD-700-1A11 airplanes).
    (2) Bombardier Service Bulletin 700-71-002, dated May 31, 2016 
(for Bombardier Model BD-700-1A10 airplanes).
    (3) Bombardier Service Bulletin 700-71-5002, dated May 31, 2016 
(for Bombardier Model BD-700-1A11 airplanes).
    (4) Bombardier Service Bulletin 700-71-6002, dated May 31, 2016 
(for Bombardier Model BD-700-1A10 airplanes).

(o) 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. 
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.

(p) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian AD CF-2016-23R1, dated February 20, 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-2017-0775.
    (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 (q)(5) and (q)(6) of this AD.

(q) 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 15, 2018.
    (i) Bombardier Service Bulletin 700-1A11-71-003, dated December 
5, 2016.
    (ii) Bombardier Service Bulletin 700-71-003, dated December 5, 
2016.
    (iii) Bombardier Service Bulletin 700-71-5003, dated December 5, 
2016.
    (iv) Bombardier Service Bulletin 700-71-6003, dated December 5, 
2016.
    (4) The following service information was approved for IBR on 
January 3, 2017 (81 FR 90961, December 16, 2016).
    (i) Bombardier Service Bulletin 700-1A11-71-002, Revision 01, 
dated June 30, 2016.
    (ii) Bombardier Service Bulletin 700-71-002, Revision 01, dated 
June 30, 2016.
    (iii) Bombardier Service Bulletin 700-71-5002, Revision 01, 
dated June 30, 2016.
    (iv) Bombardier Service Bulletin 700-71-6002, Revision 01, dated 
June 30, 2016.
    (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; 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. 2018-09734 Filed 5-10-18; 8:45 am]
 BILLING CODE 4910-13-P


