DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2020-1137; Project Identifier MCAI-2020-00816-T;
Amendment 39-21487; AD 2021-07-10]
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
ACTION: Final rule.
SUMMARY: The FAA is adopting a new airworthiness directive (AD)
certain MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700,
701 & 702), CL-600-2C11 (Regional Jet Series 550), and CL-600-2D24
(Regional Jet Series 900) airplanes. This AD was prompted by a report
that some piccolo ducts for the wing anti-ice system have bleed holes
that do not conform to requirements. This AD requires, depending on
airplane configuration, inspection for the presence of affected wing
anti-ice system piccolo ducts and corrective actions, or replacement of
affected piccolo ducts with new piccolo ducts. The FAA is issuing this
AD to address the unsafe condition on these products.
DATES: This AD is effective May 12, 2021.
The Director of the Federal Register approved the incorporation by
reference of a certain publication listed in this AD as of May 12,
ADDRESSES: For service information identified in this final rule,
contact MHI RJ Aviation ULC, 12655 Henri-Fabre Blvd., Mirabel,
Quebec J7N 1E1 Canada; Widebody Customer Response Center North
America toll-free telephone +1-844-272-2720 or direct-dial telephone
+1-514-855-8500; fax +1-514-855-8501; email firstname.lastname@example.org; internet
https://mhirj.com. You may view this service information at the FAA,
Airworthiness Products Section, Operational Safety Branch, 2200 South
216th St., 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 https://www.regulations.gov by searching for and locating
Docket No. FAA-2020-1137.
Examining the AD Docket
You may examine the AD docket on the internet at https://www.regulations.
gov by searching for and locating Docket No. FAA-2020-
1137; or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this final rule, any comments received, and other information. The
address for Docket Operations is 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: Siddeeq Bacchus, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7362; email email@example.com.
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2020-23, dated June 24,
2020 (TCCA AD CF-2020-23) (also referred to as the Mandatory Continuing
Airworthiness Information, or the MCAI), to correct an unsafe condition
for certain MHI RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series
700, 701 & 702), CL-600-2C11 (Regional Jet Series 550), and CL-600-2D24
(Regional Jet Series 900) airplanes. You may examine the MCAI in the AD
docket on the internet at https://www.regulations.gov by searching for
and locating Docket No. FAA-2020-1137.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain MHI RJ Aviation
ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2C11
(Regional Jet Series 550), and CL-600-2D24 (Regional Jet Series 900)
airplanes. The NPRM published in the Federal Register on December 21,
2020 (85 FR 82975). The NPRM was prompted by a report that some piccolo
ducts for the wing anti-ice system have bleed holes that do not conform
to requirements (such as being undersized, un-burred, or in the wrong
location). The NPRM proposed to require, depending on airplane
configuration, inspection for the presence of affected wing anti-ice
system piccolo ducts and corrective actions, or replacement of affected
piccolo ducts with new piccolo ducts. The FAA is issuing this AD to
address non-conforming piccolo duct bleed holes, which could lead to
degradation of the wing anti-ice protection of the leading edge of
certain slats, and possibly result in airplane handling issues during
critical phases of flight. See the MCAI for additional background
The FAA gave the public the opportunity to participate in
developing this final rule. The FAA received no comments on the NPRM or
on the determination of the cost to the public.
Clarification of Reporting Requirement
Bombardier Service Bulletin 670BA-30-025, dated December 17, 2019,
includes a requirement to report the pre- and post-modification part
and serial number of each replaced piccolo duct to Bombardier. The FAA
has added paragraph (h) of this AD to clarify the appropriate
compliance time for this reporting and redesignated subsequent
paragraphs accordingly. The FAA has also revised the Cost of Compliance
portion of this AD to include the estimated costs for this reporting
The FAA reviewed the relevant data and determined that air safety
and the public interest require adopting this final rule with the
changes described previously and minor editorial changes. The FAA has
determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.
The FAA also determined that these changes will not increase the
economic burden on any operator or increase the scope of this final
Related Service Information Under 1 CFR Part 51
Bombardier has issued Service Bulletin 670BA-30-025, dated December
17, 2019. This service information describes, for certain airplanes,
procedures for replacement of affected piccolo ducts with new piccolo
ducts. This service information also describes, for certain other
airplanes, procedures for inspection for the presence of affected wing
anti-icing system piccolo ducts, and depending on inspection results,
replacement of affected piccolo ducts with new piccolo ducts or
contacting the manufacturer for further instruction. 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
The FAA estimates that this AD affects 21 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions *
||Cost per product
||Cost on U.S. operators
|Up to 16 work-hours x $85 per
hour = Up to $1,360
||Up to $7,534
||Up to $8,894
||Up to $186,774
* Table does not include estimated
costs for reporting.
The FAA estimates that it would take about 1 work-hour per product
to comply with the reporting requirement in this AD. The average labor
rate is $85 per hour. Based on these figures, the FAA estimates the
cost of reporting on U.S. operators to be $1,785, or $85 per product.
Paperwork Reduction Act
A federal agency may not conduct or sponsor, and a person is not
required to respond to, nor shall a person be subject to penalty for
failure to comply with a collection of information subject to the
requirements of the Paperwork Reduction Act unless that collection of
information displays a currently valid OMB Control Number. The OMB
Control Number for this information collection is 2120-0056. Public
reporting for this collection of information is estimated to take
approximately 1 hour per response, including the time for reviewing
instructions, searching existing data sources, gathering and
maintaining the data needed, and completing and reviewing the
collection of information. All responses to this collection of
information are mandatory. Send comments regarding this burden estimate
or any other aspect of this collection of information, including
suggestions for reducing this burden, to Information Collection
Clearance Officer, Federal Aviation Administration, 10101 Hillwood
Parkway, Fort Worth, TX 76177-1524.
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.
The FAA is 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 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
(2) Will not affect intrastate aviation in Alaska, and
(3) 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
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