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Federal Register / Vol. 86, No. 12 / Thursday, January 21, 2021 / Proposed Rules
referenced service information. Boeing noted that the suggested language is also consistent with the language for the unsafe condition specified in paragraph e of the proposed AD.
The FAA acknowledges the commenters request. However, the sentence in question is not carried over to this SNPRM. The FAA has not changed this AD regarding this issue.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 73757A1349
RB, dated April 14, 2020, and Aviation Partners Boeing Alert Service Bulletin AP737C57003, dated July 28, 2020.
The service information describes procedures for repetitive high frequency eddy current HFEC inspections for cracking of the left and right wing, lower aft wing skin aft edge, at flap track numbers 1, 2, 3, 6, 7, and 8 attachment
location and applicable on-condition actions. On-condition actions include repairing any cracking found. These documents are distinct since they apply to different airplane models in different configurations.
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 The FAA is proposing this AD
because the agency evaluated all the relevant information and determined the unsafe condition described previously is likely to exist or develop in other products of the same type design. Certain changes described above expand the scope of the NPRM. As a result, the FAA has determined that it is necessary to reopen the comment period to provide additional
opportunity for the public to comment on this SNPRM.
Proposed Requirements of This SNPRM
This SNPRM would require accomplishing the actions specified in the service information described previously. For information on the procedures and compliance times, see Boeing Alert Requirements Bulletin 73757A1349 RB, dated April 14, 2020, and Aviation Partners Boeing Alert Service Bulletin AP737C57003, dated July 28, 2020, at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0587.
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:

ESTIMATED COSTS FOR REQUIRED ACTIONS
Action
Labor cost
Parts cost
HFEC inspections

7 work-hours $85 per hour = $595 per inspection cycle.

$0

The FAA has received no definitive data that would enable the FAA to provide cost estimates for the oncondition actions specified in this proposed AD.

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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
VerDate Sep<11>2014

15:58 Jan 19, 2021

Jkt 253001

$595 per inspection cycle.

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 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 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.

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Cost on U.S.
operators
Cost per product
39.13

$83,895 per inspection cycle.

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

The Boeing Company: Docket No. FAA
20200587; Product Identifier 2020
NM086AD.
a Comments Due Date The FAA must receive comments on this airworthiness directive AD by March 8, 2021.
b Affected ADs None.
c Applicability This AD applies to all The Boeing Company Model 737100, 200, 200C, 300, 400, and 500 series airplanes, certificated in any category.
d Subject Air Transport Association ATA of America Code 57, Wings.
e Unsafe Condition This AD was prompted by crack indications found in the lower aft wing skin bolt holes where the flap tracks attach to the track support fitting. The FAA is issuing this AD to address undetected cracking in the lower wing skin, which could result in the inability of the structure to carry limit load, and adversely affect the structural integrity of the airplane.

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