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Federal Register / Vol. 86, No. 242 / Tuesday, December 21, 2021 / Rules and Regulations Authority for This Rulemaking 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.
Regulatory Findings The FAA determined that 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.
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:
PART 39AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:

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Authority: 49 U.S.C. 106g, 40113, 44701.
39.13

Amended
2. The FAA amends 39.13 by:
a. Removing Airworthiness Directive AD 20171909, Amendment 39
19039 82 FR 43829, September 20, 2017; and b. Adding the following new AD:

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20212512 De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc.:
Amendment 3921856; Docket No.
FAA20211064; Project Identifier MCAI202101028T.
a Effective Date This airworthiness directive AD is effective January 5, 2022.
b Affected ADs This AD replaces AD 20171909, Amendment 3919039 82 FR 43829, September 20, 2017 AD 20171909.
c Applicability This AD applies to De Havilland Aircraft of Canada Limited Model DHC8401 and 402 airplanes, certificated in any category, serial numbers 4001 and 4003 and subsequent.
d Subject Air Transport Association ATA of America Code 32, Landing gear.
e Reason This AD was prompted by reports of a certain bolt at the pivot pin link being found missing or having stress corrosion cracking.
The FAA is issuing this AD to address failure of the pivot pin retention bolt, which could result in a loss of directional control or loss of a nose landing gear NLG tire during takeoff or landing, which could lead to runway excursions.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Maintenance or Inspection Program Revision For airplanes with pivot pin retention bolt part number P/N NAS620414D installed on the NLG assembly: Within 30 days after the effective date of this AD, or within 30
days after installation of pivot pin retention bolt part number P/N NAS620414D, whichever occurs later, revise the existing maintenance or inspection program, as applicable, to incorporate the information for Structures Safe Life Task 322101701 and Task 322101702, as specified in De Havilland Aircraft of Canada Limited Temporary Revision ALI0223, dated October 15, 2020. The initial compliance time for doing the tasks is at the applicable time specified in De Havilland Aircraft of Canada Limited Temporary Revision ALI
0223, dated October 15, 2020, or within 30
days after the effective date of this AD, whichever occurs later; except, if replacement of bolt P/N NAS620414D was performed before the effective date of this AD
as specified in De Havilland Aircraft of Canada Service Bulletin 8432161, the initial compliance time for Task 322101
702 bolt P/N NAS620414D replacement is within 3 months after the effective date of this AD or within 800 flight cycles after performing the replacement, whichever occurs later.

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h No Alternative Actions or Intervals After the existing maintenance or inspection program has been revised as required by paragraph g of this AD, no alternative actions e.g., replacements or intervals may be used unless the actions and intervals are approved as an alternative method of compliance AMOC in accordance with the procedures specified in paragraph j1 of this AD.
i Repetitive Lubrications For airplanes with pivot pin retention bolt P/N NAS620414D installed on the NLG
assembly: Within 30 days or 400 flight cycles, whichever occurs first after the effective date of this AD, and thereafter at intervals not exceeding 400 flight cycles, lubricate the trailing arm of the NLG, including doing a general visual inspection of the NLG pivot pin mechanism for discrepancies i.e., bolt P/N NAS60214D is missing or has damage e.g., stress corrosion or stress corrosion cracking and, as applicable, replacing the bolt before further flight, in accordance with paragraph 3.B. of the Accomplishment Instructions of De Havilland Aircraft of Canada Limited Service Bulletin 8432167, dated August 12, 2021.
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 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.
k Related Information 1 Refer to Mandatory Continuing Airworthiness Information MCAI TCCA AD
CF200929R4, dated October 1, 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. FAA20211064.
2 For more information about this AD, contact Antariksh Shetty, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart
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