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Federal Register / Vol. 86, No. 184 / Monday, September 27, 2021 / Proposed Rules Task 575100290801, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of Bombardier Global 6000 Aircraft Maintenance Manual Part TwoPublication No. GL 6000
AMM, Revision 39, dated May 19, 2021.
Task 575100290801, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of Bombardier Global 6500 Aircraft Maintenance Manual Part TwoPublication No. GL 6500
AMM, Revision 8, dated May 19, 2021.
Task 575100290801, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of Bombardier Global 5000 Aircraft Maintenance Manual Part TwoPublication No. BD700
AMM, Revision 71, dated May 19, 2021.
Task 575100290801, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of Bombardier Global 5000 Featuring Global Vision Flight Deck Aircraft Maintenance Manual Part TwoPublication No. GL 5000
GVFD AMM, Revision 38, dated May 19, 2021.
Task 575100290801, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of Bombardier Global 5500 Aircraft Maintenance Manual Part TwoPublication No. GL 5500
AMM, Revision 7, dated May 19, 2021.
These documents describe amendments to the AMM to include inspections of the inboard flap internal ribs for corrosion. These documents are distinct since they apply to different airplane serial numbers.
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.

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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 develop on other products of the same type design.
Proposed Requirements of This NPRM
This proposed AD would require revising the existing maintenance or inspection program, as applicable, to incorporate the information specified in AMM Task 575100290801 and the compliance times for AMM Task 5751
00290801.

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The AMM task corresponds to Part 3, Task 575100201, Special Detailed Inspection of the Inboard-Flap Internal Ribs, of the applicable Bombardier Time Limits/Maintenance Checks TLMC, which is referenced in the MCAI.
Costs of Compliance The FAA estimates that this proposed AD affects 141 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 develop on products identified in this rulemaking action.
Regulatory Findings 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,
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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.
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. FAA2021
0832; Project Identifier MCAI2020
01550T.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by November 12, 2021.
b Affected ADs None.
c Applicability This AD applies to Bombardier, Inc., Model BD7001A10 and BD7001A11
airplanes, certificated in any category, serial numbers 9001 through 9879 inclusive, 9998, and 60001 through 60033 inclusive.
d Subject Air Transport Association ATA of America Code 05, Time Limits/Maintenance Checks.
e Reason This AD was prompted was prompted by reports of internal corrosion on the inboard flaps found prior to regularly scheduled maintenance checks. The FAA is issuing this AD to address internal corrosion on the inboard flaps, which could result in reduced structural integrity, detachment of the flap, and consequent reduced controllability of the airplane.
f Compliance 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
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