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Federal Register / Vol. 86, No. 161 / Tuesday, August 24, 2021 / Proposed Rules
airplanes, certificated in any category, as identified in Boeing Alert Requirements Bulletin 73753A1388 RB, dated October 27, 2020.
d Subject Air Transport Association ATA of America Code 53, Fuselage.
e Unsafe Condition This AD was prompted by an evaluation by the design approval holder DAH indicating that the frame splice between stringer S13
and S14 is subject to widespread fatigue damage WFD. The FAA is issuing this AD
to address upper frame cracking common to the frame splice between stringer S13 and S14, which could interact with stringer S
14 skin lap splice lower fastener row cracking in lower skin and result in an uncontrolled decompression of the airplane and loss of structural integrity.
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 73753A1388 RB, dated October 27, 2020, do all applicable actions identified in, and in accordance with, the Accomplishment Instructions of Boeing Alert Requirements Bulletin 73753A1388
RB, dated October 27, 2020.
Note 1 to paragraph g: Guidance for accomplishing the actions required by this AD can be found in Boeing Alert Service Bulletin 73753A1388, dated October 27, 2020, which is referred to in Boeing Alert Requirements Bulletin 73753A1388 RB, dated October 27, 2020.

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h Exceptions to Service Information Specifications 1 Where Boeing Alert Requirements Bulletin 73753A1388 RB, dated October 27, 2020, uses the phrase the Original Issue date of Requirements Bulletin 73753A1388 RB, this AD requires using the effective date of this AD, except where Alert Requirements Bulletin 73753A1388 RB, dated October 27, 2020, uses the phrase the Original Issue date of Requirements Bulletin 73753A1388 RB, in a note or flag note.
2 Where Boeing Alert Requirements Bulletin 73753A1388 RB, dated October 27, 2020, specifies contacting Boeing for repair instructions or for alternative inspections:
This AD requires doing the repair, or doing the alternative inspections and applicable oncondition actions 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, Los Angeles 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
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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-ANMLAACO-AMOC-Requests@faa.gov.
2 Before using any approved AMOC, notify your appropriate principal inspector, 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, Los Angeles 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.

Havilland Aircraft of Canada Limited Model DHC8401 and 402 airplanes.
This proposed AD was prompted by reports of a possible hard contact between the 2 top high level sensor HLS terminal screw head and the 6
outer wing fuel access panel stiffener flange. This proposed AD would require removing and replacing or reworking the 6 outer wing fuel access panel assembly. 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 October 8, 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 j Related Information https www.regulations.gov. Follow the 1 For more information about this AD, instructions for submitting comments.
contact Wayne Ha, Aerospace Engineer, Fax: 2024932251.
Airframe Section, FAA, Los Angeles ACO
Mail: U.S. Department of Branch, 3960 Paramount Boulevard, Transportation, Docket Operations, Lakewood, CA 907124137; phone: 562627
M30, West Building Ground Floor, 5238; fax: 5626275210; email: wayne.ha@
Room W12140, 1200 New Jersey faa.gov.
Avenue SE, Washington, DC 20590.
2 For service information identified in Hand Delivery: Deliver to Mail this AD, contact Boeing Commercial address above between 9 a.m. and 5
Airplanes, Attention: Contractual & Data Services C&DS, 2600 Westminster Blvd., p.m., Monday through Friday, except MC 110SK57, Seal Beach, CA 907405600;
Federal holidays.
telephone 5627971717; internet https
For service information identified in www.myboeingfleet.com. You may view this this NPRM, contact De Havilland referenced service information at the FAA, Aircraft of Canada Limited, Q-Series Airworthiness Products Section, Operational Technical Help Desk, 123 Garratt Safety Branch, 2200 South 216th St., Des Boulevard, Toronto, Ontario M3K 1Y5, Moines, WA. For information on the Canada; telephone 4163754000; fax availability of this material at the FAA, call 4163754539; email thd@
2062313195.
dehavilland.com; internet https
Issued on July 26, 2021.
dehavilland.com. You may view this Lance T. Gant, service information at the FAA, Director, Compliance & Airworthiness Airworthiness Products Section, Division, Aircraft Certification Service.
Operational Safety Branch, 2200 South FR Doc. 202118069 Filed 82321; 8:45 am 216th St., Des Moines, WA. For BILLING CODE 491013P
information on the availability of this material at the FAA, call 2062313195.
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210694; Project Identifier MCAI202100305T
RIN 2120AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc. Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for De
SUMMARY:

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210694; 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 information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Thomas Niczky, Aerospace Engineer, Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516
2287347; fax 5167945531; email 9avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:

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