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Federal Register / Vol. 86, No. 106 / Friday, June 4, 2021 / Rules and Regulations develop on products identified in this rulemaking action.
Regulatory Findings 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, 2 Will not affect intrastate aviation in Alaska, and 3 Will not have a significant economic impact, positive or negative, on a substantial number of small entities under the criteria of the Regulatory Flexibility Act.
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:

1. The authority citation for part 39
continues to read as follows:

Authority: 49 U.S.C. 106g, 40113, 44701.
Amended
2. The FAA amends 39.13 by adding the following new airworthiness directive:

20211104 De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc.:
Amendment 3921566; Docket No.
FAA20200975; Project Identifier 2020NM061AD.
a Effective Date This airworthiness directive AD is effective July 9, 2021.
b Affected Airworthiness Directives ADs None.
c Applicability This AD applies to De Havilland Aircraft of Canada Limited type certificate previously held by Bombardier, Inc. Model DHC8400, 401, and 402 airplanes, certificated in any category, having serial numbers 4001, and 4003 through 4534
inclusive.

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Air Transport Association ATA of America Code 32, Landing Gear.
e Reason This AD was prompted by a report of main landing gear MLG retractions after striking an obstacle or severe wheel imbalance after a tire failure. The FAA is issuing this AD to address loss of MLG downlock signal caused by the vibrations from those events, which leads to de-energizing the MLG solenoid sequence valve and subsequent removal of hydraulic pressure from the MLG downlock actuator. Loss of the hydraulic pressure in the downlock actuator, combined with the vibrations, can cause the stabilizer brace to unlock and the MLG to subsequently retract.
f Compliance Comply with this AD within the compliance times specified, unless already done.
g Downlock Sensor Rigging and Reduced Lock Link Over-Center Within 9 months after the effective date of this AD: Verify both the height of the lock link over-center stop pin and the gap of the left-hand and right-hand MLG downlock proximity sensors, and perform corrective actions as required, in accordance with paragraphs 3.A. and 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 8432140, Revision B, dated January 30, 2018. Do all applicable corrective actions before further flight.
h Installation of Proximity Sensor Electronic Unit PSEU Part Number P/N
301450601
Within 18 months after the effective date of this AD, install PSEU P/N 301450601 in accordance with paragraphs 3.A. and 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 8432143, Revision B, dated November 16, 2016.

PART 39AIRWORTHINESS
DIRECTIVES

39.13

d Subject
i Installation of PSEU P/N 301450602
Installing PSEU P/N 301450602 in accordance with paragraphs 3.A. and 3.B. of the Accomplishment Instructions of Bombardier Service Bulletin 8432149, dated November 16, 2016, also accomplishes the requirements of paragraphs g and h of this AD.
j Credit for Previous Actions 1 This paragraph provides credit for actions required by paragraph g of this AD, if those actions were performed before the effective date of this AD using the service information as specified in paragraphs j1i or ii of this AD.
i Bombardier Service Bulletin 8432140, dated August 5, 2016.
ii Bombardier Service Bulletin 8432
140, Revision A, dated June 12, 2017.
2 This paragraph provides credit for actions required by paragraphs g and h of this AD, if PSEU P/N 301450601 was installed before the effective date of this AD
using the service information as specified in paragraphs j2i or ii of this AD.
i Bombardier Service Bulletin 8432143, dated June 30, 2016.

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ii Bombardier Service Bulletin 8432
143, Revision A, dated August 5, 2016.
k 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 local Flight Standards District 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 local flight standards district office/certificate holding district 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.
l Related Information 1 Refer to Mandatory Continuing Airworthiness Information MCAI TCCA AD
CF201631R1, dated March 24, 2017, 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. FAA20200975.
2 For more information about this AD, contact Darren Gassetto, Aerospace Engineer, Mechanical Systems and Administrative Services Section, FAA, New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516228
7323; fax 5167945531; email 9-avsnyacocos@faa.gov.
3 Service information identified in this AD that is not incorporated by reference is available at the addresses specified in paragraphs m3 and 4 of this AD.
m Material Incorporated by Reference 1 The Director of the Federal Register approved the incorporation by reference IBR of the service information listed in this paragraph under 5 U.S.C. 552a and 1 CFR
part 51.
2 You must use this service information as applicable to do the actions required by this AD, unless this AD specifies otherwise.
i Bombardier Service Bulletin 8432140, Revision B, dated January 30, 2018.
ii Bombardier Service Bulletin 8432
143, Revision B, dated November 16, 2016.
iii Bombardier Service Bulletin 8432
149, dated November 16, 2016.
3 For service information identified in this AD, contact De Havilland Aircraft of Canada Limited, Q-Series Technical Help
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