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Rules and Regulations
Federal Register Vol. 86, No. 195
Wednesday, October 13, 2021

This section of the FEDERAL REGISTER
contains regulatory documents having general applicability and legal effect, most of which are keyed to and codified in the Code of Federal Regulations, which is published under 50 titles pursuant to 44 U.S.C. 1510.
The Code of Federal Regulations is sold by the Superintendent of Documents.

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210260; Project Identifier MCAI202001255T; Amendment 3921745; AD 20212007
RIN 2120AA64

Airworthiness Directives; Airbus Canada Limited Partnership Type Certificate Previously Held by C Series Aircraft Limited Partnership CSALP;
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 Airbus Canada Limited Partnership Model BD5001A10 and BD500
1A11 airplanes. This AD was prompted by a report that following an in-service engine shutdown during taxi, water was found to be dripping into the forward avionics bay; the water caused a short circuit and tripped a circuit breaker.
This AD requires replacing the forward galley slotted drain covers with solid blanking plates and modifying the associated drain tubing to block water.
The FAA is issuing this AD to address the unsafe condition on these products.
DATES: This AD is effective November 17, 2021.
The Director of the Federal Register approved the incorporation by reference of a certain publication listed in this AD
as of November 17, 2021.
ADDRESSES: For service information identified in this final rule, contact Airbus Canada Limited Partnership, 13100 Henri-Fabre Boulevard, Mirabel, Quebec J7N 3C6, Canada; telephone 4504767676; email a220_crc@
abc.airbus internet https
a220world.airbus.com. You may view this service information at the FAA,
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SUMMARY:

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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.
FAA20210260.
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. FAA2021
0260; 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, M
30, 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; email 9-avs-nyaco-cos@
faa.gov.
SUPPLEMENTARY INFORMATION:
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202030R1, dated December 11, 2020
TCCA AD CF202030R1 also referred to as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Airbus Canada Limited Partnership Model BD5001A10 and BD5001A11 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. FAA2021
0260.
The FAA issued a notice of proposed rulemaking NPRM to amend 14 CFR
part 39 by adding an AD that would apply to certain Airbus Canada Limited Partnership Model BD5001A10 and BD5001A11 airplanes. The NPRM
published in the Federal Register on April 26, 2021 86 FR 21969. The NPRM was prompted by a report that
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following an in-service engine shutdown during taxi, water was found to be dripping into the forward avionics bay; the water caused a short circuit and tripped a circuit breaker. The NPRM
proposed to require replacing the forward galley slotted drain covers with solid blanking plates and modifying the associated drain tubing to block water.
The FAA is issuing this AD to address water ingress into the forward avionics bay, which could short circuit the equipment in the bay area and lead to a loss of air data sources and consequent reduced functional capabilities and increase in crew workload, possibly leading to a loss of continued safe flight and landing. 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.
Support for the Proposed AD
Air Line Pilots Association, International ALPA stated that it supports the NPRM.
Request To Clarify Details of In-Service Event Delta Air Lines requested that the FAA review the background information contained in TCCA AD CF202030R1, and verify the details with Airbus Canada Limited Partnership Airbus Canada to ensure the accuracy of the FAA AD. Delta Air Lines stated that it contacted Airbus Canada about the inservice engine shutdown phrase in the background statement, and found that there was no actual engine power loss in either event reported and that the flightcrew had reactively shut down the engine under normal procedures before returning to the gate. Delta Air Lines believes misleading information was communicated that caused TCCA to release the TCCA AD with incorrect information.
The FAA provides the following clarification of the event. The FAA
contacted TCCA to discuss in detail the events leading up to the in-service engine shutdown before publishing the NPRM for public comment. In those discussions, it was determined and confirmed that while there was no actual engine power loss in either event,
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