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Federal Register / Vol. 86, No. 106 / Friday, June 4, 2021 / Rules and Regulations Reserve Bank solely to those participating eligible institutions.
2 The participating eligible institutions in an excess balance account shall authorize another institution to act as agent of the participating institutions for purposes of general account management, including but not limited to transferring the balances of participating institutions in and out of the excess balance account.
An excess balance account must be established at the Reserve Bank where the agent maintains its master account, unless otherwise determined by the Board. The agent may not commingle its own funds in the excess balance account.
3 Balances maintained in an excess balance account may not be used for general payments or other activities.
4 Interest on balances of eligible institutions maintained in an excess balance account is the amount equal to the IORB rate in effect on a day multiplied by the total balances maintained on that day.

By order of the Board of Governors of the Federal Reserve System.
Ann Misback, Secretary of the Board.
FR Doc. 202111758 Filed 6321; 8:45 am BILLING CODE 621001P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20200975; Project Identifier 2020NM061AD; Amendment 3921566; AD 20211104
RIN 2120AA64

Airworthiness Directives; De Havilland Aircraft of Canada Limited Type Certificate Previously Held by Bombardier, Inc. Airplanes Federal Aviation Administration FAA, Department of Transportation DOT.
ACTION: Final rule.
AGENCY:

The FAA is adopting a new airworthiness directive AD for certain De Havilland Aircraft of Canada Limited Model DHC8400, 401, and 402
airplanes. 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. This AD requires inspections for correct height of the lock link overcenter stop pin and for correct gaps of the left-hand and right-hand MLG

SUMMARY:

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downlock proximity sensors, replacement of the shim if necessary, corrective actions, and installation of a new, improved proximity sensor electronic unit PSEU with software changes. The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective July 9, 2021.
The Director of the Federal Register approved the incorporation by reference of certain publications listed in this AD
as of July 9, 2021.
ADDRESSES: For service information identified in this final rule, contact De Havilland Aircraft of Canada Limited, Q-Series Technical Help Desk, 123
Garratt Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416375
4000; 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.
It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20200975.
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. FAA2020
0975; 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 final rule, any comments received, and other information. The address for Docket Operations is U.S. Department of Transportation, Docket Operations, M30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION 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 5162287323; fax 5167945531; email 9-avs-nyacocos@faa.gov.
SUPPLEMENTARY INFORMATION:
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
201631R1, dated March 24, 2017
TCCA AD CF201631R1 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition
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for certain De Havilland Aircraft of Canada Limited Model DHC8400, 401, and 402 airplanes. You may examine the MCAI in the AD docket on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2020
0975.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain De Havilland Aircraft of Canada Limited Model DHC8400, 401, and 402 airplanes. The NPRM
published in the Federal Register on November 2, 2020 85 FR 69276. The NPRM was prompted by a report of MLG retractions after striking an obstacle or severe wheel imbalance after a tire failure. The NPRM proposed to require inspections for correct height of the lock link over-center stop pin and for correct gaps of the left-hand and right-hand MLG downlock proximity sensors, replacement of the shim if necessary, corrective actions, and installation of a new improved PSEU
with software changes. 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 SSV 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.
See the MCAI for additional background information.
Comments The FAA gave the public the opportunity to participate in developing this final rule. The following presents the comments received on the NPRM
and the FAAs response to each comment.
Request To Exclude Certain Steps of the Accomplishment Instructions of Service Information Horizon Air requested that paragraphs g, h, and i of the proposed AD be revised to require only paragraph 3.B. of the Accomplishment Instructions of the service bulletins referenced in those paragraphs. Horizon Air stated that the Job Set-up section paragraph 3.A. of the Accomplishment Instructions do not directly address the unsafe condition.
Horizon Air also asserted that retaining the Job Set-up sections restricts an operators ability to do other maintenance in conjunction with the required service bulletins.
The FAA disagrees with the request to exclude paragraph 3.A., Job Set-up, of
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