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Federal Register / Vol. 86, No. 107 / Monday, June 7, 2021 / Proposed Rules
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by reports of cracks in the station STA 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 in the intercostal lug fitting at the left and right side BL 11.33. The FAA is issuing this AD to 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.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Required Actions Except as specified by paragraph h of this AD: At the applicable times specified in the Compliance paragraph of Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 74753A2904
RB, dated December 16, 2020.
Note 1 to paragraph g: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 74753A2904, dated December 16, 2020, which is referred to in Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020.

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h Exceptions to Service Information Specifications 1 Where Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, uses the phrase the original issue date of Requirements Bulletin 74753A2904
RB, this AD requires using the effective date of this AD.
2 Where Boeing Alert Requirements Bulletin 74753A2904 RB, dated December 16, 2020, specifies contacting Boeing for repair instructions: This AD requires doing the repair using a method approved in accordance with the procedures specified in paragraph i of this AD.
i Alternative Methods of Compliance AMOCs 1 The Manager, Seattle 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.
Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector,
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or lacking a principal inspector, the manager of the responsible Flight Standards Office.
3 An AMOC that provides an acceptable level of safety may be used for any repair, modification, or alteration required by this AD if it is approved by The Boeing Company Organization Designation Authorization ODA that has been authorized by the Manager, Seattle ACO Branch, FAA, to make those findings. To be approved, the repair method, modification deviation, or alteration deviation must meet the certification basis of the airplane, and the approval must specifically refer to this AD.
j Related Information 1 For more information about this AD, contact Stefanie Roesli, Aerospace Engineer, Airframe Section, FAA, Seattle ACO Branch, 2200 South 216th St., Des Moines, WA
98198; phone and fax: 2062313964; email:
Stefanie.N.Roesli@faa.gov.
2 For service information identified in this AD, contact Boeing Commercial Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., MC 110SK57, Seal Beach, CA 907405600;
telephone 5627971717; internet https
www.myboeingfleet.com. You may view this referenced 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.
Issued on May 18, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202111844 Filed 6421; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210450; Project Identifier 2017SW100AD
RIN 2120AA64

Airworthiness Directives; Airbus Helicopters Deutschland GmbH AHD
Helicopters Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for Airbus Helicopters Deutschland GmbH
AHD Model MBBBK 117 D2
helicopters. This proposed AD was prompted by the discovery that certain parts that are approved for installation on multiple helicopter models are life limited parts when installed on Model MBBBK 117 D2 helicopters and some helicopter delivery documents excluded
SUMMARY:

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the life limit information. This proposed AD would require determining the total hours time-in-service TIS of a certain part-numbered rotor mast nut and reidentifying a certain part-numbered rotor mast nut. This proposed AD would also require establishing a life limit for a certain part-numbered rotor mast nut and helical gear support, and removing each part from service before reaching its life limit. Additionally, this proposed AD would require replacing a certain part-numbered main gearbox MGB
with a not affected MGB as specified in a European Aviation Safety Agency now European Union Aviation Safety Agency EASA AD, which is proposed for incorporation by reference IBR. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by July 22, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 202 4932251.
Mail: U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For material that is proposed for IBR
in this AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; telephone +49 221 8999 000;
email ADs@easa.europa.eu; internet www.easa.europa.eu. You may find this material on the EASA website at https
ad.easa.europa.eu. You may view this material at the FAA, Office of the Regional Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N321, Fort Worth, TX 76177. For information on the availability of this material at the FAA, call 817 2225110. It is also available in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210450.
Examining the AD Docket You may examine the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0450; 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 NPRM, any comments received, and other
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