DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2016-6892; Directorate Identifier 2016-NM-057-AD;
Amendment 39-18529; AD 2016-11-02]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc. Airplanes

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

ACTION: Final rule; request for comments.

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SUMMARY: We are adopting a new airworthiness directive (AD) 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. This AD requires a
detailed visual inspection of the upper and lower engine pylons for
protruding, loose, or missing fasteners; and repair, including
applicable related investigative and corrective actions, if necessary.
This AD was prompted by reports of loose or
missing Hi-Lite fasteners 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 detect and correct protruding,
loose, or missing fasteners, which could result in structural failure
of the engine pylons.

DATES: This AD becomes effective June 10, 2016.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of June 10,
2016.
We must receive comments on this AD by July 11, 2016.

ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the
instructions for submitting comments.
Fax: 202-493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC 20590.
Hand Delivery: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue SE., Washington, DC, between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
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
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-2016-6892.

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-
6892; or in person at the Docket Operations office 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 Operations office
(telephone 800-647-5527) is in the ADDRESSES section. Comments will be
available in the AD docket shortly after receipt.

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

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian Airworthiness Directive CF-
2016-10, dated April 27, 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 on the left hand (LH) and right hand (RH) 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 has 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 [repair including applicable related
investigative and corrective actions] noted in accordance with a
Repair Engineering Order (REO).
This AD is issued to mandate a repeat inspection to mitigate the
risk of a structural failure of the engine pylons and repair any
loose or missing fasteners as required.

Related investigative actions include visual inspections for cracks.
Corrective actions include repair. You may examine the MCAI on the
Internet at http://www.regulations.gov by searching for and locating
Docket No. FAA-2016-6892.

Related Service Information Under 1 CFR Part 51

We reviewed 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,'' dated March 7, 2016.
The service information describes procedures for repair, including
applicable related investigative and corrective actions.
We also reviewed Bombardier Temporary Revision 54-0007, dated March
8, 2016, to the CRJ700/900/1000 AMM. The 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.
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.

FAA's Determination and Requirements of This AD

This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to our bilateral agreement with the State of Design Authority, we have
been notified of the unsafe condition described in the MCAI and service
information referenced above. We are issuing this AD because we
evaluated all pertinent information and determined the unsafe condition
exists and is likely to exist or develop on other products of this same
type design.

FAA's Determination of the Effective Date

An unsafe condition exists that requires the immediate adoption of
this AD. The FAA has found that the risk to the flying public justifies
waiving notice and comment prior to adoption of this rule because loose
or missing Hi-Lite fasteners on the upper and lower engine pylon
structure common to the upper and lower pylon skin panels and engine
thrust fitting could result in structural failure of the engine pylons.
Therefore, we determined that notice and opportunity for public comment
before issuing this AD are impracticable and that good cause exists for
making this amendment effective in fewer than 30 days.

Comments Invited

This AD is a final rule that involves requirements affecting flight
safety, and we did not precede it by notice and opportunity for public
comment. We invite you to send any written relevant data, views, or
arguments about this AD. Send your comments to an address listed under
the ADDRESSES section. Include ``Docket No. FAA-2016-6892; Directorate
Identifier 2016-NM-057-AD'' at the beginning of your comments. We
specifically invite comments on the overall regulatory, economic,
environmental, and energy aspects of this AD. We will consider all
comments received by the closing date and may amend this AD based on those
comments.
We will post all comments we receive, without change, to http://www.regulations.
gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive about this AD.

Costs of Compliance

We estimate that this AD affects 531 airplanes of U.S. registry.
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 $45,135, or $85 per product.
In addition, we estimate that any necessary follow-on actions will
take up to 32 work-hours for a cost of $2,720 per product, plus the
cost of parts. We have received no definitive data that would enable us
to provide cost estimates for the on-condition actions specified in
this AD. We have no way of determining the number of aircraft that
might need this action.
According to the manufacturer, some of the costs of this AD may be
covered 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.

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 adding the following new airworthiness
directive (AD):