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Federal Register / Vol. 86, No. 50 / Wednesday, March 17, 2021 / Proposed Rules
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.

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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.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI and service information referenced above. The FAA
is proposing this AD because the FAA
evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or
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develop on other products of the same type design.

develop on products identified in this rulemaking action.

Proposed Requirements of This NPRM

Regulatory Findings
This proposed AD would require revising the existing maintenance or inspection program, as applicable, to incorporate new or more restrictive airworthiness limitations.
This proposed AD would require revisions to certain operator maintenance documents to include new actions e.g., inspections. Compliance with these actions is required by 14 CFR
91.403c. For airplanes that have been previously modified, altered, or repaired in the areas addressed by this proposed AD, the operator may not be able to accomplish the actions described in the revisions. In this situation, to comply with 14 CFR 91.403c, the operator must request approval for an alternative method of compliance according to paragraph i1 of this proposed AD.

The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:
1 Is not a significant regulatory action under Executive Order 12866, 2 Would not affect intrastate aviation in Alaska, and 3 Would not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.

Costs of Compliance The FAA estimates that this proposed AD affects 133 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this proposed 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 operators incorporate maintenance or inspection program changes for their affected fleets, the FAA has determined that a per-operator estimate is more accurate than a per-airplane estimate. Therefore, the agency estimates the average total cost per operator to be $7,650 90 work-hours
$85 per work-hour.
Authority for This Rulemaking Title 49 of the United States Code specifies the FAAs 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 Agencys 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
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List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.
The Proposed Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

Bombardier, Inc.: Docket No. FAA2020
1181; Project Identifier MCAI2020
01368T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD action by May 3, 2021.
b Affected Airworthiness Directives ADs None.
c Applicability This AD applies to all Bombardier, Inc., Model CL6001A11 600, CL6002A12
601, and CL6002B16 6013A, 6013R, and 604 Variants airplanes, certificated in any category.
d Subject Air Transport Association ATA of America Code 05, Time Limits/Maintenance Checks.

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