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Federal Register / Vol. 86, No. 156 / Tuesday, August 17, 2021 / Rules and Regulations
45857

ESTIMATED COSTS
Action
Labor cost
Removal and installation
Inspections

24 work-hours $85 per hour = $2,040
8 work-hours $85 per hour = $680

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
Regulatory Findings 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:
1 Is not a significant regulatory action under Executive Order 12866, and 2 Will not affect intrastate aviation in Alaska.

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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:

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$2,000
0

Cost per product $4,040
680

PART 39AIRWORTHINESS
DIRECTIVES

Boeing 737800/900ER Series Aircraft, Document No. EO23964202, Revision B, dated April 25, 2016.

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

h Inspection and Repair Before further flight after accomplishing the removal required by paragraph g of this AD, inspect the external and feed-through doublers, intercostals, skin, stringers, and frames in the area around the removed external equipment for any cracking in accordance with paragraph 3.3., Inspection, of Astronics Connectivity Systems and Certification Service Bulletin SB44964201, dated July 8, 2021. If any cracking is found, before further flight, repair using a method approved in accordance with the procedures specified in paragraph j of this AD.

Authority: 49 U.S.C. 106g, 40113, 44701.

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.

Parts cost
39.13

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

20211708 The Boeing Company:
Amendment 3921691; Docket No.
FAA20210670; Project Identifier AD
202100849T.
a Effective Date This airworthiness directive AD is effective August 17, 2021.
b Affected ADs None.
c Applicability This AD applies to The Boeing Company Model 737800 and 900ER series airplanes, certificated in any category, with ViaSat InFlight Connectivity IFC System Antenna Provisions installed in accordance with Astronics Armstrong Aerospace Supplemental Type Certificate STC
ST04096CH.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by reports that several of the fittings that provide attachment between the radome and fuselage were cracked to the point of failure. The FAA is issuing this AD to address cracked fittings, which could result in loss of the radome and antennae, and consequent damage to the tail and damage to the fuselage in the vicinity of the radome, which could reduce the ability of the flightcrew to maintain safe flight and landing of the airplane.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Demodification Part I Removal of External Equipment Before further flight, remove external equipment including radome, antenna, and associated structure that was installed in accordance with STC ST04096CH. Do the removal in accordance with steps 1 through 9 of paragraph 5.2.1., of Astronics Armstrong Aerospace Engineering Order, ViaSat InFlight Connectivity IFC System DEMOD

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i Demodification Part II Installation and System Deactivation Before further flight after accomplishing the actions required by paragraph h of this AD: Install doubler and fasteners and deactivate the system including pulling and collaring associated circuit breakers if installed in accordance with steps 10, 11, and 12 of paragraph 5.2.1., of Astronics Armstrong Aerospace Engineering Order, ViaSat In-Flight Connectivity IFC System DEMOD Boeing 737800/900ER Series Aircraft, Document No. EO23964202, Revision B, dated April 25, 2016.
j Alternative Methods of Compliance AMOCs 1 The Manager, Chicago ACO Branch, FAA, has the authority to approve AMOCs for this AD, if requested using the procedures found in 14 CFR 39.19. In accordance with 14 CFR 39.19, send your request to your principal inspector or responsible Flight Standards Office, as appropriate. If sending information directly to the manager of the certification office, send it to the attention of the person identified in Related Information.
2 Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
k Related Information For more information about this AD, contact Surinder Sangha, Aerospace Engineer, Propulsion & Program Management Section, FAA, Chicago ACO Branch, Room 107, 2300 East Devon Avenue, Des Plaines, IL 60018; telephone 8472947010; fax 847
2947834; email: surinder.sangha@faa.gov.
l Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference IBR of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.

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