[Federal Register Volume 82, Number 222 (Monday, November 20, 2017)]
[Rules and Regulations]
[Pages 55040-55042]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2017-24737]



[[Page 55040]]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2017-0338; Product Identifier 2016-NM-153-AD; Amendment 
39-19103; AD 2017-23-09]
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 adopting a new airworthiness directive (AD) for certain 
Bombardier, Inc., Model CL-600-2A12 (CL-601 Variant) and CL-600-2B16 
(CL-601-3A, CL-601-3R, and CL-604 Variants) airplanes. This AD was 
prompted by a determination that the bushing holes on the engine mount 
rib might not conform to the engineering drawings and that certain 
inspections of the engine mount rib must be included in the 
airworthiness limitations section (ALS) of the Instructions for 
Continued Airworthiness (ICA). This AD requires revising the 
maintenance or inspection program to incorporate certain airworthiness 
limitation items (ALIs). We are issuing this AD to address the unsafe 
condition on these products.

DATES: This AD is effective December 26, 2017.

ADDRESSES: For service information identified in this final rule, 
contact Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval, 
Qu[eacute]bec H4S 1Y9, Canada; Widebody Customer Response Center North 
America toll-free telephone 1-866-538-1247 or direct-dial telephone 1-
514-855-2999; fax 514-855-7401; email [email protected]; 
Internet http://www.bombardier.com. You may view this referenced 
service information at the FAA, Transport Standards Branch, 1601 Lind 
Avenue SW., Renton, WA. For information on the availability of this 
material at the FAA, call 425-227-1221. It is also available on the 
Internet at http://www.regulations.gov by searching for and locating 
Docket No. FAA-2017-0338.

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-
0338; 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 street 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, New York Aircraft ACO Branch, 
FAA, 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 by adding an AD that would apply to certain Bombardier, Inc., 
Model CL-600-2A12 (CL-601 Variant) and CL-600-2B16 (CL-601-3A, CL-601-
3R, and CL-604 Variants) airplanes. The NPRM published in the Federal 
Register on June 14, 2017 (82 FR 27219) (``the NPRM''). The NPRM was 
prompted by a determination that the bushing holes on the engine mount 
rib might not conform to the engineering drawings and that certain 
inspections of the engine mount rib must be included in the ALS of the 
ICA. The NPRM proposed to require revising the maintenance or 
inspection program to incorporate certain ALIs. We are issuing this AD 
to detect and correct failure of an engine mount rib. Failure of an 
engine mount rib could compromise the structural integrity of the 
engine mount and could lead to subsequent detachment of an engine.
    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued Canadian Airworthiness Directive CF-
2015-09R1, dated June 29, 2015 (referred to after this as the Mandatory 
Continuing Airworthiness Information, or ``the MCAI''), to correct an 
unsafe condition for certain Bombardier, Inc., Model CL-600-2A12 (CL-
601 Variant) and CL-600-2B16 (CL-601-3A, CL-601-3R, and CL-604 
Variants) airplanes. The MCAI states:

    The aeroplane manufacturer has determined that the bushing holes 
on the engine mount rib may not conform to the engineering drawings. 
Non-conforming bushing holes could increase loading on adjacent 
fasteners, resulting in premature fatigue cracking of the engine 
mount rib.
    In addition, it was also discovered that the inspection 
requirements for the engine mount rib were not listed in the 
Airworthiness Limitations Section of the Instructions for Continued 
Airworthiness.
    Failure of the engine mount rib could compromise the structural 
integrity of the engine mount and could lead to subsequent 
detachment of an engine.
    A new Time Limits/Maintenance Checks (TLMC) Airworthiness 
Limitations (AWL) task is introduced to ensure that any fatigue 
cracking of the engine mount rib is detected and corrected.
    The original issue of this [Canadian] AD mandated the 
incorporation of a new TLMC AWL task [into the maintenance or 
inspection program, as applicable].
    Revision 1 of this [Canadian] AD is issued to remove model CL-
600-1A11 (600) aeroplanes from the Applicability section of the 
[Canadian] AD since this model was incorrectly included in the 
original issue.

    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-
0338.

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 Revise Applicability

    Bombardier, Inc. (Bombardier) and NetJets Inc. (NetJets) requested 
that we revise paragraph (c)(3) of the proposed AD. The commenters 
explained that the Applicability should specify Model CL-600-2B16 (CL-
604 Variant) airplanes having serial numbers (S/Ns) 5301 through 5665 
inclusive, and S/Ns 5701 through 5990 inclusive; instead of Model CL-
600-2B16 (CL-604 Variant) airplanes, having S/Ns 5301 through 5665 
inclusive, and S/Ns 5701 and subsequent.
    Bombardier stated that ``Challenger 650'' is a marketing 
designation for Model CL-600-2B16 (604 Variant) airplanes starting at 
S/N 6050, and ``Challenger 605'' is a marketing designation for Model 
CL-600-2B16 (604 Variant) airplanes having S/Ns 5701 to 5990. 
Bombardier and NetJets stated that future Model CL-600-2B16 (CL-604 
Variant) airplanes having serial numbers subsequent to S/N 5990 do not 
require the proposed actions, explaining that task 54-50-00-103 
(inspections of the engine mount rib) was first incorporated into the 
Time Limits/Maintenance Checks (TLMC) manual for Challenger 650 
airplanes. Therefore, Bombardier asserts that operators of Challenger 
650 airplanes should not be required to comply with the AD.
    We agree with the commenters' requests. We have coordinated with 
TCCA and have verified that Model CL-

[[Page 55041]]

600-2B16 (CL-604 Variant) airplanes having serial numbers subsequent to 
S/N 5990 should not be subject to the required actions. We have changed 
paragraph (c)(3) of this AD accordingly.

Requests To Clarify Method of Compliance (MOC) for Maintenance/
Inspection Program Revision

    Bombardier requested that more details be provided on how to meet 
the intent of paragraph (g) of the proposed AD, which specifies 
contacting the FAA for a MOC for revising the maintenance or inspection 
program to incorporate maintenance tasks. Bombardier suggested that the 
AD should specify the revisions in which the tasks were incorporated 
into the TLMC manual. Bombardier also suggested that this would prevent 
operators with a proper TLMC from being subject to a future AD. 
Bombardier stated that the AD should specify the tasks to be 
incorporated in the maintenance schedule, in order to provide operators 
with a sufficient level of detail on the revisions to be made to their 
maintenance or inspection program.
    NetJets requested that we identify the specific tasks that are to 
be incorporated into the maintenance or inspection program. NetJets 
noted that the MCAI provides the specific task numbers.
    We partially agree. We agree that operators need to know which 
actions must be incorporated into their maintenance or inspection 
programs. Therefore, we have revised paragraph (g) of this AD to 
identify the actions that must be incorporated.
    We do not agree to identify specific TLMC revisions in this AD. The 
service information specified in Note 1 to paragraph (g) of this AD 
provides guidance on the required actions. However, to specify the 
service information in paragraph (g) of this AD would require it to be 
incorporated by reference in this AD. The service information 
identified in this AD does not meet the Office of the Federal 
Register's criteria for materials incorporated by reference. Therefore, 
we have not changed this AD in this regard.

Conclusion

    We reviewed the relevant data, considered 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 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.
    We also determined that these changes will not increase the 
economic burden on any operator or increase the scope of this AD.

Costs of Compliance

    We estimate that this AD affects 129 airplanes of U.S. registry. We 
estimate the following costs to comply with this AD:

                                                 Estimated Costs
----------------------------------------------------------------------------------------------------------------
                                                                                    Cost per       Cost on U.S.
              Action                        Labor cost            Parts cost        product         operators
----------------------------------------------------------------------------------------------------------------
Revision of maintenance or          1 work-hour x $85 per                  $0              $85          $10,965
 inspection program.                 hour = $85.
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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 adding the following new airworthiness 
directive (AD):

2017-23-09 Bombardier, Inc.: Amendment 39-19103; Docket No. FAA-
2017-0338; Product Identifier 2016-NM-153-AD.

(a) Effective Date

    This AD is effective December 26, 2017.

(b) Affected ADs

    None.

[[Page 55042]]

(c) Applicability

    This AD applies to the Bombardier, Inc., airplanes identified in 
paragraphs (c)(1), (c)(2), and (c)(3) of this AD, certificated in 
any category.
    (1) Bombardier, Inc., Model CL-600-2A12 (CL-601) airplanes, 
having serial numbers (S/Ns) 3001 through 3066 inclusive.
    (2) Bombardier, Inc., Model CL-600-2B16 (CL-601-3A and CL-601-3R 
Variants) airplanes, having S/Ns 5001 through 5194 inclusive.
    (3) Bombardier, Inc., Model CL-600-2B16 (CL-604 Variant) 
airplanes having S/Ns 5301 through 5665 inclusive, and S/Ns 5701 
through 5990 inclusive.

(d) Subject

    Air Transport Association (ATA) of America Code 05, Periodic 
inspections.

(e) Reason

    This AD was prompted by a determination that the bushing holes 
on the engine mount rib may not conform to the engineering drawings 
and that certain inspections of the engine mount rib must be 
included in the airworthiness limitations section (ALS) of the 
Instructions for Continued Airworthiness (ICA). We are issuing this 
AD to detect and correct failure of an engine mount rib. Failure of 
an engine mount rib could compromise the structural integrity of the 
engine mount and could lead to subsequent detachment of an engine.

(f) Compliance

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

(g) Maintenance or Inspection Program Revision

    Within 60 days after the effective date of this AD: Revise the 
maintenance or inspection program, as applicable, to incorporate 
inspections for fatigue cracking of the engine mount rib and 
corrective actions, as applicable, in accordance with a method 
approved by the Manager, New York ACO Branch, FAA.
    Note 1 to paragraph (g) of this AD: Guidance can be found in 
Tasks 54-10-00-106 and 54-50-00-103 of Chapter 5 of the Bombardier 
Time Limits/Maintenance Checks (TLMC) Manual PSP 601-5 (for Model 
CL-600-2A12 (CL-601 Variant) airplanes); Bombardier TLMC Manual PSP 
601A-5 (for CL-600-2B16 (CL-601-3A and CL-601-3R Variants) 
airplanes); Bombardier TLMC Manual CL-604 (for Model CL-600-2B16 
(CL-604 Variant) airplanes, S/Ns 5301 through 5665 inclusive); and 
Bombardier TLMC Manual CL-605 (for Model CL-600-2B16 (CL-604 
Variant) airplanes, S/Ns 5701 through 5990).

(h) No Alternative Actions and/or Intervals

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

(i) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York ACO Branch, FAA, has the authority to approve AMOCs for this 
AD, if requested using the procedures found in 14 CFR 39.19. In 
accordance with 14 CFR 39.19, send your request to your principal 
inspector or local Flight Standards District Office, as appropriate. 
If sending information directly to the manager of the certification 
office, send it to ATTN: Program Manager, Continuing Operational 
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531. Before 
using any approved AMOC, notify your appropriate principal 
inspector, or lacking a principal inspector, the manager of the 
local flight standards district office/certificate holding district 
office.
    (2) Contacting the Manufacturer: For any requirement in this AD 
to obtain corrective actions from a manufacturer, the action must be 
accomplished using a method approved by the Manager, New York ACO 
Branch, FAA; or 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.

(j) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) Canadian Airworthiness Directive CF-2015-09R1, dated June 29, 
2015, 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-2017-0338.
    (2) For more information about this AD, contact Aziz Ahmed, 
Aerospace Engineer, Airframe and Mechanical Systems Section, New 
York Aircraft ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, 
Westbury, NY 11590; telephone 516-228-7329; fax 516-794-5531.

(k) Material Incorporated by Reference

    None.

    Issued in Renton, Washington, on November 7, 2017.
Dionne Palermo,
Acting Director, System Oversight Division, Aircraft Certification 
Service.
[FR Doc. 2017-24737 Filed 11-17-17; 8:45 am]
 BILLING CODE 4910-13-P


