Federal Register - August 31, 2021
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Source: Federal Register
48483
Rules and Regulations
Federal Register Vol. 86, No. 166
Tuesday, August 31, 2021
This section of the FEDERAL REGISTER
contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210376; Project Identifier AD202100062T; Amendment 3921689; AD 20211706
RIN 2120AA64
Airworthiness Directives; The Boeing Company Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Final rule.
AGENCY:
The FAA is adopting a new airworthiness directive AD for all The Boeing Company Model 747100, 100B, 100B SUD, 200B, 200C, 200F, 300, 400, 400D, 400F, 747SR, and 747SP airplanes. This AD
was prompted by reports of cracks found in the front spar shear tie and at the intercostal lug fitting at certain locations. This AD requires repetitive detailed and surface high frequency eddy current HFEC inspections of the front spar shear tie and intercostal lug fitting at certain locations for any cracking, and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.
SUMMARY:
This AD is effective October 5, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of October 5, 2021.
ADDRESSES: For service information identified in this final rule, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC
110SK57, Seal Beach, CA 907405600;
khammond on DSKJM1Z7X2PROD with RULES
DATES:
VerDate Sep<11>2014
19:07 Aug 30, 2021
Jkt 253001
telephone 5627971717; internet https www.myboeingfleet.com. You may view this service information at the FAA, Airworthiness Products Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA. For information on the availability of this material at the FAA, call 2062313195.
It is also available at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0376.
address any cracking in these areas that could result in the loss of limit load capability in a principal structural element, the potential inability to restrain the cargo for certain cargo configurations, and the potential for a center fuel tank rupture for certain cargo configurations under limit load conditions, which could adversely affect the structural integrity of the airplane.
Examining the AD Docket
Comments
You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210376; or in person at Docket Operations between 9 a.m. and 5 p.m., Monday through Friday, except Federal holidays. The AD docket contains this final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT:
Stefanie Roesli, Aerospace Engineer, Airframe Section, FAA, Seattle ACO
Branch, 2200 South 216th St., Des Moines, WA 98198; phone and fax: 206
2313964; email: Stefanie.N.Roesli@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to all The Boeing Company Model 747100, 100B, 100B SUD, 200B, 200C, 200F, 300, 400, 400D, 400F, 747SR, and 747SP airplanes. The NPRM published in the Federal Register on June 7, 2021 86 FR 30216.
The NPRM was prompted by reports of cracks found in the front spar shear tie and at the intercostal lug fitting at certain locations. In the NPRM, the FAA
proposed to require repetitive detailed and surface HFEC inspections of the front spar shear tie and intercostal lug fitting at certain locations for any cracking, and applicable on-condition actions. The FAA is issuing this AD to
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Discussion of Final Airworthiness Directive
The FAA received a comment from Boeing who supported the NPRM
without change.
Conclusion The FAA reviewed the relevant data, considered the comment received, and determined that air safety requires adopting this AD as proposed. Except for minor editorial changes, this AD is adopted as proposed in the NPRM.
None of the changes will increase the economic burden on any operator.
Related Service Information Under 1
CFR Part 51
The FAA reviewed Boeing Alert Requirements Bulletin 74753A2904
RB, dated December 16, 2020. This service information specifies procedures for repetitive detailed and surface HFEC
inspections of the station 1000 front spar shear tie at the left and right side buttock line BL 11.33, BL 33.99, BL
57.50, and BL 75.92, and of the intercostal lug fitting at the left and right side BL 11.33, for any cracking, and applicable on-condition actions. Oncondition actions include repair, installing a new front spar shear tie, and installing a new intercostal lug fitting.
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.
Costs of Compliance The FAA estimates that this AD will affect 117 airplanes of U.S. registry. The FAA estimates the following costs to comply with this AD:
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