Voglio sapere a riguardo di…

Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Rules and Regulations 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 Boeing 727
Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727
Supplemental Structural Inspection Document D6480401, Volume II, Temporary Revision 111001, dated February 2020. In combination, this
service information describes repetitive inspections for cracking of internal wing SSIs. 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 40 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:
The FAA has determined that revising the existing maintenance or inspection
11107

program takes an average of 90 workhours per operator, although the agency recognizes that this number may vary from operator to operator. In the past, the FAA has estimated that this action takes 1 work-hour per airplane. 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 FAA estimates the average total cost per operator to be $7,650 90 work-hours $85 per workhour.

ESTIMATED COSTS
Action
Labor cost
Inspections

48 work-hours $85 per hour = $4,080 per inspection cycle.

Cost per product
Parts cost $0

$4,080 per inspection cycle.

Cost on U.S. operators $163,200 per inspection cycle.

Table does not include estimated costs for revising the existing maintenance or inspection program.

The FAA has received no definitive data on which to base the cost estimates for the on-condition repairs specified in this AD.
Authority for This Rulemaking
khammond on DSKJM1Z7X2PROD with RULES

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.

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.
Adoption of the Amendment Accordingly, under the authority delegated to me by the Administrator, the FAA amends 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.

Regulatory Findings
39.13

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 responsibilities among the various levels of government.
For the reasons discussed above, I
certify that this AD:

VerDate Sep<11>2014

16:14 Feb 23, 2021

Jkt 253001

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

20210309 The Boeing Company:
Amendment 3921412 ; Docket No.
FAA20201021; Project Identifier AD
202000847T.
a Effective Date This airworthiness directive AD is effective March 31, 2021.

PO 00000

Frm 00017

Fmt 4700

Sfmt 4700

b Affected Airworthiness Directives ADs This AD affects AD 981103 R1, Amendment 3910983 64 FR 989, January 7, 1999 AD 981103 R1.
c Applicability This AD applies to all The Boeing Company 727, 727C, 727100, 727100C, 727200, and 727200F 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 a determination that excessive sealant coating on internal wing Structural Significant Items SSIs may not reveal cracks during inspections required by AD 981103 R1. The FAA is issuing this AD to address excessive sealant coating on internal wing SSIs that may prevent the detection of cracks during inspections. This condition, if not addressed, could result in propagation of structural cracks that could lead to the inability of a wing SSI to sustain limit load and result in loss of control of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Maintenance or Inspection Program Revision, Repetitive Inspections, and Repair 1 Prior to reaching the applicable time specified in paragraph g2i or ii of this AD, incorporate a revision into the existing maintenance or inspection program, as applicable, that provides no less than the required damage tolerance rating DTR for each SSI of the wing listed in Boeing 727
Supplemental Structural Inspection Document D6480401, Volume I, Temporary Revision 081001, dated February 2020; and Boeing 727 Supplemental
E:FRFM24FER1.SGM

24FER1