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Federal Register / Vol. 86, No. 148 / Thursday, August 5, 2021 / Rules and Regulations
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 develop on products identified in this rulemaking action.
Regulatory Findings
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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
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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 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.

b Affected ADs
List of Subjects in 14 CFR Part 39

e Reason
Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.

This AD was prompted by reports of corrosion on the passenger door internal structure of in-service airplanes. This AD was further prompted by a determination that new or more restrictive airworthiness limitations are necessary. 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.

Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 14 CFR part 39 as follows:

1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211312 Bombardier, Inc.: Amendment 3921617; Docket No. FAA20201181;
Project Identifier MCAI202001368T.
a Effective Date This airworthiness directive AD is effective September 9, 2021.

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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.

f Compliance
PART 39AIRWORTHINESS
DIRECTIVES

39.13

None.

Comply with this AD within the compliance times specified, unless already done.
g Maintenance or Inspection Program Revision Within 30 days after the effective date of this AD: Revise the existing maintenance or inspection program, as applicable, to incorporate the information specified in the applicable time limits/maintenance checks TLMC revision specified in figure 1 to paragraph g of this AD. The initial compliance time for doing the tasks is at the time specified in the TLMC, or within 30
days after the effective date of this AD, whichever occurs later.
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