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Federal Register / Vol. 86, No. 110 / Thursday, June 10, 2021 / Rules and Regulations Kit 764393, Left Wing Main Spar Caps Replacement, dated June 9, 2012 Piper Kit 764393. Piper SB No. 552A applies to Models PA36285 and PA36300
airplanes and contains procedures for repetitively inspecting wing spar carry through assembly P/N 9737000. Piper Kit 764394 identifies the applicable parts and specifies procedures for replacing the right wing main spar caps, which includes the attachment bolts and wing carry through spar fittings and assembly. Piper Kit 764393 identifies
the applicable parts and specifies procedures for replacing the left wing main spar caps, which includes the attachment bolts and wing carry through spar fittings and assembly. 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 ADDRESSES.
Other Related Service Information The FAA also reviewed Piper Aircraft Corporation Service Bulletin No. 552,
dated February 3, 1978 Piper SB No.
552. Piper SB No. 552 contains the same procedures as Piper SB No. 552A, but Piper SB No. 552 only applies to Model PA36285 airplanes.
Costs of Compliance The FAA estimates that this AD will affect 123 airplanes of U.S. registry.
The FAA estimates the following costs to comply with this AD:

ESTIMATED COSTS
Cost per product
Cost on U.S.
operators
Action
Labor cost
Parts cost
Inspection of P/N 9737000 wing spar carry through assembly.
Replacement of the wing attachment upper bolt and lower bolt.
Replacement of wing carry through spar assembly .
Replacement of Piper Kit 764393 Left and Piper Kit 764394 Right .

8 work-hours $85 per hour = $680

Not applicable

$680

$83,640

10 work-hours $85 per hour = $850

$1,310 both bolts

2,160

265,680

30 work-hours $85 per hour = $2,550

$23,467

26,017

3,200,091

20 work-hours $85 per hour = $1,700

$26,867 both kits

28,567

3,513,741

The wing carry through spar fitting, P/N 9771303, is included in the wing carry through spar assembly, P/N 7682402.
The replacement for the wing spar fitting P/N 9771200 and the replacement for spar assembly P/Ns 9770100 and 9770101 are included in Piper Kit 764393 and Piper Kit 764394.

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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 has determined that 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:

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1 Is not a significant regulatory action under Executive Order 12866, 2 Will not affect intrastate aviation in Alaska to the extent that it justifies making a regulatory distinction, 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.

b Affected ADs
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.
Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive 790103, Amendment 393383 44 FR
36, January 2, 1979, Docket No. 78EA
69; and Airworthiness Directive 8320
03, Amendment 394739 48 FR 45535, October 6, 1983, Docket No. 83CE23
AD; and

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20211116 Piper Aircraft, Inc.:
Amendment 3921578; Docket No.
FAA20200881; Project Identifier 2018CE024AD.
a Effective Date This airworthiness directive AD is effective July 15, 2021.
This AD replaces AD 790103, Amendment 393383 44 FR 36, January 2, 1979 AD 790103; and AD 832003, Amendment 394739 48 FR 45535, October 6, 1983 AD 832003.
c Applicability This AD applies to Piper Aircraft, Inc.
Models PA36285, PA36300, and PA36
375 airplanes, certificated in any category.
d Subject

39.13

b. Adding the following new airworthiness directive:

Joint Aircraft System Component JASC
Code 5700, Wings.
e Unsafe Condition This AD was prompted by a review of AD
832003 and AD 790103 and the determination that the requirements of those ADs did not address all of the affected airplanes. The FAA is issuing this AD to prevent fatigue damage to the wing structural components. The unsafe condition, if not addressed, could result in failure of the wing structure with consequent loss of control.

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