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Federal Register / Vol. 86, No. 160 / Monday, August 23, 2021 / Proposed Rules
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 39
Docket No. FAA20210691; Project Identifier MCAI202001542T
RIN 2120AA64

Airworthiness Directives; Bombardier, Inc., Airplanes Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

The FAA proposes to adopt a new airworthiness directive AD for certain Bombardier, Inc., Model BD
1001A10 airplanes. This proposed AD
was prompted by reports of erratic electrical system status on the push button annunciators PBAs and the engine instrument and crew alerting system EICAS. This proposed AD
would require revising the existing airplane flight manual AFM and applicable corresponding operational procedures to incorporate procedures to be applied during erroneous electrical status indication conditions. The FAA is proposing this AD to address the unsafe condition on these products.
DATES: The FAA must receive comments on this proposed AD by October 7, 2021.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
Federal eRulemaking Portal: Go to https www.regulations.gov. Follow the instructions for submitting comments.
Fax: 2024932251.
Mail: U.S. Department of Transportation, Docket Operations, M
30, West Building Ground Floor, Room W12140, 1200 New Jersey Avenue SE, Washington, DC 20590.
Hand Delivery: Deliver to Mail address above between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Bombardier, Inc., 200 Cote-Vertu Road West, Dorval, Quebec H4S 2A3, Canada; North America toll-free telephone 1866538
1247 or direct-dial telephone 1514
8552999; email ac.yul@
aero.bombardier.com; internet https
www.bombardier.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.

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SUMMARY:

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Examining the AD Docket You may examine the AD docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210691; 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 NPRM, any comments received, and other information. The street address for Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Steven Dzierzynski, Aerospace Engineer, Avionics and Electrical Systems Section, FAA, New York ACO
Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 5162287367; fax 5167945531; email 9-avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this proposal. Send your comments to an address listed under ADDRESSES. Include Docket No.
FAA20210691; Project Identifier MCAI202001542T at the beginning of your comments. The most helpful comments reference a specific portion of the proposal, explain the reason for any recommended change, and include supporting data. The FAA will consider all comments received by the closing date and may amend the proposal because of those comments.
Except for Confidential Business Information CBI as described in the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to https
www.regulations.gov, including any personal information you provide. The agency will also post a report summarizing each substantive verbal contact received about this NPRM.
Confidential Business Information CBI is commercial or financial information that is both customarily and actually treated as private by its owner.
Under the Freedom of Information Act FOIA 5 U.S.C. 552, CBI is exempt from public disclosure. If your comments responsive to this NPRM
contain commercial or financial information that is customarily treated as private, that you actually treat as private, and that is relevant or responsive to this NPRM, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission containing CBI
as PROPIN. The FAA will treat such marked submissions as confidential under the FOIA, and they will not be
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placed in the public docket of this NPRM. Submissions containing CBI
should be sent to Steven Dzierzynski, Aerospace Engineer, Avionics and Electrical Systems Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; telephone 5162287367; fax 5167945531; email 9-avs-nyaco-cos@
faa.gov. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in the public docket for this rulemaking.
Background Transport Canada Civil Aviation TCCA, which is the aviation authority for Canada, has issued TCCA AD CF
202046, dated November 17, 2020
TCCA AD CF202046 also referred to after this as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Bombardier, Inc., Model BD1001A10 airplanes. You may examine the MCAI in the AD
docket at https www.regulations.gov by searching for and locating Docket No.
FAA20210691.
This proposed AD was prompted by reports of erratic electrical system status on the PBA and the EICAS, while onground and during flight. Some of those incidents resulted in the airplane experiencing momentary loss of electrical power and loss of flight displays following flightcrew actions.
The FAA is proposing this AD to address erroneous indications that could mislead pilots, causing them to turn off active electrical power sources, leading to partial or complete loss of electrical power. Loss of electrical power could result in the loss of flight displays and reduced controllability of the airplane. See the MCAI for additional background information.
Related Service Information Under 1
CFR Part 51
Bombardier has issued the following sections of the applicable AFMs. This service information provides procedures to inform the pilots not to turn off active generators in the event of an erroneous electrical status indication.
Section 0319, Electrical, of Chapter 03, Emergency Procedures, of the Bombardier Challenger 300
Imperial Version Airplane Flight Manual, Publication No. CSP 1001, Revision 63, dated April 1, 2021. For obtaining this section of the Bombardier Challenger 300 Imperial Version Airplane Flight Manual, Publication No.
CSP 1001, use Document Identification No. CH 300 AFMI.
Section 0519, Electrical, of Chapter 05, Non-Normal Procedures, of
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