DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-6897; Directorate Identifier 2015-NM-187-AD;
Amendment 39-18853; AD 2017-08-04]
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) 2015-03-01,
for all Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 &
440) airplanes. AD 2015-03-01 required installing additional attaching
hardware on the left and right engine fan cowl access panels and the
nacelle attaching structures. This new AD requires weight and balance
data to be included in the Weight and Balance Manual for certain
modified airplanes. This new AD also requires the weight and balance
data to be used in order to calculate the center of gravity for
affected airplanes. This AD was prompted by updates to the weight and
balance data needed to calculate the center of gravity for affected
airplanes. We are issuing this AD to address the unsafe condition on
these products.

DATES: This AD is effective May 17, 2017.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of May 17,
2017.
The Director of the Federal Register approved the incorporation by
reference of a certain other publication listed in this AD as of March
17, 2015 (80 FR 7298, February 10, 2015).

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 400 Cote Vertu Road West, Dorval,
Quebec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-
7401; email thd.crj@aero.bombardier.com; Internet http://www.bombardier.com.
You may view this referenced service information at
the FAA, Transport Airplane Directorate, 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-2016-6897.

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-2016-
6897; 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 Branch, ANE-171, FAA, New York Aircraft
Certification Office (ACO), 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 2015-03-01, Amendment 39-18097 (80 FR 7298,
February 10, 2015) (``AD 2015-03-01''). AD 2015-03-01 applied to all
Bombardier, Inc. Model CL-600-2B19 (Regional Jet Series 100 & 440)
airplanes. The NPRM published in the Federal Register on June 8, 2016
(81 FR 36813). The NPRM was prompted by updates to the weight and
balance data needed to calculate the center of gravity for affected
airplanes. The NPRM proposed to continue to require installing
additional attaching hardware on the left and right engine fan cowl
access panels and the nacelle attaching structures. The NPRM also
proposed to require weight and balance data to be included in the
Weight and Balance Manual and applicable logbooks for certain modified
airplanes. We are issuing this AD to prevent damage to the fuselage and
flight control surfaces from dislodged engine fan cowl access panels,
and prevent incorrect weight and balance calculations. Incorrect weight
and balance calculations may shift the center of gravity beyond
approved design parameters and affect in-flight control, which could
endanger passengers and crew.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2014-20R1, dated August 12, 2015 (referred to after this as the
Mandatory Continuing Airworthiness Information, or ``the MCAI''), to
correct an unsafe condition for all Bombardier, Inc. Model CL-600-2B19
(Regional Jet Series 100 & 440) airplanes. The MCAI states:

There have been a number of engine fan cowl panel dislodgement
incidents reported on the Bombardier CL-600-2B19 aeroplane fleet.
The dislodged panels may cause damage to the fuselage and flight
control surfaces of the aeroplane. Also, the debris from a dislodged
panel may result in runway contamination and has the potential of
causing injury on the ground.
Although the majority of the subject panel dislodgements were
reported on the first or second flight after an engine maintenance
task was performed that required removal and reinstallation of the
subject panels, the frequency of the dislodgements indicates that
the existing attachment design is prone to human (maintenance)
error.
In order to mitigate the potential safety hazard of the subject
panel dislodgement, Bombardier had issued Service Bulletin (SB)
601R-71-034 to install additional fasteners for the attachment of
the engine fan cowl panels to the nacelle's structure. Compliance of
the above SB was mandated by the original issue of [Canadian] AD CF-
2014-20 dated 9 July 2014 [which corresponded to FAA AD 2015-03-01].
Bombardier has now revised the SB 601R-71-034 (to Revision C)
requiring weight and balance data to be included in the Weight and
Balance manual for aeroplanes modified per the subject SB. This
revised [Canadian] AD is issued to mandate compliance with SB 601R-
71-034, Rev C.

Required actions also include the retained actions of modifying the
engine fan cowl access panel. 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-2016-6897.

Comments

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

Request To Refer to Revised Service Information

Air Wisconsin Airlines requested that we revise the NPRM to refer
to Bombardier Service Bulletin 601R-71-034, Revision D, dated October
7, 2016. Air Wisconsin also asked that we add Bombardier Service
Bulletin CF34-NAC-71-042, Revision C, dated September 4, 2016. Air
Wisconsin stated that the hardware kits are identified in this service
information.
We partially agree with the commenter's request. No additional work
is required by Bombardier Service Bulletin 601R-71-034, Revision D,
dated October 7, 2016; it merely adds notes for clarification and
contains minor editorial changes. Since Bombardier Service Bulletin
CF34-NAC-71-042, Revision C, dated September 4, 2016, is a secondary
source of service information, it is not referenced in this AD.
We have revised the Related Service Information under 1 CFR part 51
section of the preamble and paragraphs (g) and (h) of this AD to refer
to Bombardier Service Bulletin 601R-71-034, Revision D, dated October
7, 2016.
We have also redesignated paragraph (i) of the proposed AD as
paragraph (i)(1) of this AD, and added credit for actions required by
paragraph (g) of this AD if accomplished prior to the effective date of
this AD using Bombardier Service Bulletin 601R-71-034, Revision C,
dated May 8, 2015.
We have also added paragraph (i)(2) to this AD to provide credit
for actions required by paragraph (h) of this AD if accomplished prior
to the effective date of this AD using Bombardier Service Bulletin
601R-71-034, Revision C, dated May 8, 2015.

Clarification of Alternative Methods of Compliance (AMOCs) Paragraph

We have revised paragraph (j)(1)(ii) of this AD to clarify that
Global AMOC 15-36, dated August 28, 2015, is approved for the
corresponding provisions of paragraph (g) of this AD.

Conclusion

We reviewed the available data, including the comment 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.

Related Service Information Under 1 CFR Part 51

Bombardier, Inc. has issued Service Bulletin 601R-71-034, Revision
B, dated August 1, 2014; and Service Bulletin 601R-71-034, Revision D,
dated October 7, 2016. The service information provides procedures for
modifying the engine fan cowl access panels and the nacelle attaching
structures. These documents are distinct because Service Bulletin 601R-
71-034, Revision D, dated October 7, 2016, also includes weight and
balance information. 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 497 airplanes of U.S. registry.
The actions required by AD 2015-03-01 and retained in this AD take
about 8 work-hours per product, at an average labor rate of $85 per
work-hour. Required parts cost about $5,458 per product. Based on these
figures, the estimated cost of the actions that are required by AD
2015-03-01 is $6,138 per product.
We also estimate that it will take about 1 work-hour per product to
comply with the basic requirements of this AD. The average labor rate
is $85 per work-hour. Based on these figures, we estimate the cost of
this AD on U.S. operators to be $42,245, or $85 per product.

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.

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

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]

2. The FAA amends Sec. 39.13 by removing Airworthiness Directive (AD)
2015-03-01, Amendment 39-18097 (80 FR 7298, February 10, 2015) and
adding the following new AD: