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Federal Register / Vol. 86, No. 122 / Tuesday, June 29, 2021 / Proposed Rules nacelle and landing gear attachment pins was not applied, and corrosion on the internal bore of the wing rear spar attachment pins was found. The FAA is issuing this AD to address premature corrosion and subsequent failure of the nacelle to landing gear and nacelle to rear wing spar attachment pins, which if undetected, could lead to a single or dual collapse of the main landing gear.

f Compliance Comply with this AD within the compliance times specified, unless already done.
g Inspection and Corrective Actions 1 At the applicable compliance times specified in paragraphs g1i through iii of this AD: Do a detailed visual inspection of the nacelle to wing rear spar attachment pins,
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and the nacelle and landing gear attachment pins, for any cracking or corrosion, and do all applicable corrective actions, in accordance with Part A or Part B, as applicable, of Section 3., Accomplishment Instructions, of the applicable service information specified in figure 1 to paragraph g of this AD. Do all applicable corrective actions before further flight.

Serial Numbers-

Service Information-

4001, 4003 through 4550
inclusive
De Havilland Service Bulletin 84-54-28, Revision B, dated January 24, 2020

4001, 4003 through 4533
inclusive, 4583 through 4585 inclusive, 4587, 4588 and 4590

De Havilland Service Bulletin 84-54-31, Revision B, dated February 21, 2020

i For nacelle to wing rear spar attachment pins, or nacelle and landing gear attachment pins, as applicable, that have accumulated less than 26,000 flight cycles as of the effective date of this AD, and have been in service less than 12 years from their entryinto-service as of the effective date of this AD: Prior to the pins reaching 14 years from their entry-into-service, or prior to the airplane reaching 30,000 total flight cycles, whichever occurs first.
ii For nacelle to wing rear spar attachment pins, or nacelle and landing gear attachment pins, as applicable, that have accumulated 26,000 flight cycles or more as of the effective date of this AD, or have been in service 12 years or more from their entryinto-service as of the effective date of this AD: Within 4 years or 8,000 flight hours after the effective date of this AD, whichever occurs first.
iii For airplanes on which the actions specified in Bombardier Service Bulletin 84
5427, dated August 11, 2017; or Bombardier Service Bulletin 845428, dated August 11, 2017; as applicable, have been accomplished:
Within 14 years or 30,000 flight cycles after the date of incorporation of Bombardier Service Bulletin 845427, dated August 11, 2017; or Bombardier Service Bulletin 8454
28, dated August 11, 2017; as applicable, whichever occurs first.
2 For serial numbers 4583, 4584, 4585, 4587, 4588 and 4590: At the applicable compliance times specified in paragraphs g1i through iii of this AD, re-part mark the yoke attachment pin, in accordance with Part B of the Accomplishment Instructions of De Havilland Service Bulletin 845431, Revision B, dated February 21, 2020.
h Credit for Previous Actions This paragraph provides credit for actions required by paragraph g of this AD, if those actions were performed before the effective
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date of this AD using the applicable service information specified in paragraphs h1
through 3 of this AD.
1 Bombardier Service Bulletin 845428, Revision A, dated April 10, 2019.
2 Bombardier Service Bulletin 845431, dated May 1, 2019.
3 Bombardier Service Bulletin 845431, Revision A, dated October 15, 2019.

by the Manager, New York ACO Branch, FAA; or Transport Canada Civil Aviation TCCA; or De Havilland Aircraft of Canada Limiteds TCCA Design Approval Organization DAO. If approved by the DAO, the approval must include the DAOauthorized signature.

i No Reporting Requirement Although De Havilland Service Bulletin 845428, Revision B, dated January 24, 2020; and De Havilland Service Bulletin 84
5431, Revision B, dated February 21, 2020;
specify to submit certain information to the manufacturer, this AD does not include that requirement.

1 Refer to Mandatory Continuing Airworthiness Information MCAI TCCA AD
CF202051R1, dated February 24, 2021, for related information. This MCAI may be found in the AD docket on the internet at https www.regulations.gov by searching for and locating Docket No. FAA20210514.
2 For more information about this AD, contact Deep Gaurav, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 5162287300; fax 5167945531; email 9avs-nyaco-cos@faa.gov.
3 For service information identified in this AD, contact De Havilland Aircraft of Canada Limited, Q-Series Technical Help Desk, 123 Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416
3754000; fax 4163754539; email thd@
dehavilland.com; internet https
dehavilland.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.

j Other FAA AD Provisions The following provisions also apply to this AD:
1 Alternative Methods of Compliance AMOCs: The Manager, New York 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 ATTN: Program Manager, Continuing Operational Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 5162287300; fax 5167945531. Before using any approved AMOC, notify your appropriate principal inspector, or lacking a principal inspector, the manager of the responsible Flight Standards Office.
2 Contacting the Manufacturer: For any requirement in this AD to obtain instructions from a manufacturer, the instructions must be accomplished using a method approved
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k Related Information
Issued on June 23, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202113726 Filed 62821; 8:45 am BILLING CODE 491013P

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Figure 1 to paragraph g - Service Information