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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20201181; Project Identifier MCAI202001368T; Amendment 3921617; AD 20211312
RIN 2120AA64

Airworthiness Directives; Bombardier, Inc., Airplanes Federal Aviation Administration FAA, Department of Transportation DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for all Bombardier, Inc., Model CL6001A11
600, CL6002A12 601, and CL600
2B16 6013A, 6013R and 604
Variants airplanes. This AD was prompted by reports of corrosion on the passenger door internal structure of inservice airplanes. This AD requires revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective September 9, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of September 9, 2021.
ADDRESSES: For service information identified in this final rule, contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval, Quebec H4S 2A3, Canada;
North America toll-free telephone 1
8665381247 or direct-dial telephone 15148552999; email ac.yul@
aero.bombardier.com; internet https
www.bombardier.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 2062313195.
It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20201181.
SUMMARY:

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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. FAA2020
1181; 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,
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any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 5162287329; fax 516794
5531; email 9-avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
201637, dated November 25, 2016 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for all Bombardier, Inc., Model CL600
1A11 600, CL6002A12 601, and CL6002B16 6013A, 6013R, and 604 Variants 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. FAA2020
1181.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all Bombardier, Inc., Model CL6001A11 600, CL6002A12
601, and CL6002B16 6013A, 601
3R and 604 Variants airplanes. The NPRM published in the Federal Register on March 17, 2021 86 FR
14551. The NPRM was prompted by reports of corrosion on the passenger door internal structure of in-service airplanes caused by an accumulation of moisture under the epoxy ramp. The NPRM proposed to require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations. The FAA is issuing this AD
to address corrosion on the passenger door internal structure and consequent loss of the structural integrity of the forward passenger door. See the MCAI
for additional background information.
Comments 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.
Conclusion The FAA reviewed the relevant data and determined that air safety and the public interest require adopting this
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final rule as proposed, except for 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.
Related Service Information Under 1
CFR Part 51
The FAA reviewed the following Bombardier service information, which describes new or more restrictive airworthiness limitations for the upper latch pins of the forward passenger door. These documents are distinct since they apply to different airplane configurations. Note: The asterisk or one star with the last three digits of the task number indicates that the task is an airworthiness limitation task.
Task 531001101 , Upper Latch Pins of the Passenger Door, of Bombardier Challenger CL6001A11
Time Limits/Maintenance Checks TLMC, Product Support Publication PSP 605, Revision 39, dated January 8, 2018.
Task 531001101 , Upper Latch Pins of the Passenger Door, of Bombardier Challenger CL6002A12
TLMC, PSP 6015, Revision 46, dated January 8, 2018.
Task 531001101 , Upper Latch Pins of the Passenger Door, of Bombardier Challenger CL6002B16
TLMC, PSP 601A5, Revision 42, dated January 8, 2018.
Task 532000188 , Special Detailed Inspection of the Upper Latch Pins of the Passenger Door, of Bombardier Challenger TLMC, CH 604
TLMC, Revision 32, dated December 18, 2019.
Task 532000188 , Special Detailed Inspection of the Upper Latch Pins of the Passenger Door, of Bombardier Challenger TLMC, CH 605
TLMC, Revision 21, dated December 18, 2019.
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 133 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:
The FAA has determined that revising the maintenance or inspection program takes an average of 90 work-hours per operator, although the agency recognizes that this number may vary from operator to operator. Since
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