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Federal Register / Vol. 86, No. 92 / Friday, May 14, 2021 / Rules and Regulations
Section, Operational Safety Branch, 2200 South 216th St., Des Moines, WA.
For information on the availability of this material at the FAA, call 206231
3195. It is also available on the internet at https www.regulations.gov by searching for and locating Docket No.
FAA20210342.
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
0342; or in person at the Docket Operations office between 9 a.m. and 5
p.m., Monday through Friday, except Federal holidays. The AD docket contains this AD, any comments received, and other information. The street address for the Docket Operations office is listed above.
FOR FURTHER INFORMATION CONTACT:
Jiwan Karunatilake, Aerospace Engineer, Airframe and Propulsion Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; telephone 516
2287300; fax 5167945531; email 9avs-nyaco-cos@faa.gov.
SUPPLEMENTARY INFORMATION:

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Discussion Transport Canada Civil Aviation TCCA which is the aviation authority for Canada, has issued TCCA AD CF
202047, dated November 18, 2020
TCCA AD CF202047 referred to after this as the Mandatory Continuing Airworthiness Information, or the MCAI, to correct an unsafe condition for certain Bombardier, Inc., Model BD
1001A10 airplanes. You may examine the MCAI on the internet at https
www.regulations.gov by searching for and locating Docket No. FAA2021
0342.
This AD was prompted by a report of a number of low altitude engine surge incidents during takeoff. Under certain environmental conditions e.g., temperature/thermal inversion, the existing engine control features can lead to engine surge. The FAA is issuing this AD to address engine surges during takeoff, which can result in significant loss of engine thrust or even engine shutdown and can occur on both engines at the same time. See the MCAI
for additional background information.
Related Service Information Under 1
CFR Part 51
Bombardier has issued Section 0204, Systems Limitations, of Chapter 02, LIMITATIONS; and Section 0403 of Chapter 04, NORMAL PROCEDURES;
of Challenger 300 Airplane Flight Manual Imperial Version, Publication
VerDate Sep<11>2014

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No. CSP 1001, Revision 63, dated April 1, 2021. Section 0204, Systems Limitations, of Chapter 02, LIMITATIONS provides a procedure for Air Conditioning and Pressurization; and Section 0403 of Chapter 04, NORMAL PROCEDURES
provides a procedure for Taxi and Before Takeoff. The procedures require the left and right engine bleeds to be ON during takeoff. For obtaining the procedures for Bombardier Challenger 300 Airplane Flight Manual Imperial Version, Publication No. CSP 1001, use Document Identification No. CH 300
AFMI. This service information is reasonably available because the interested parties have access to it through their normal course of business or by the means identified in the ADDRESSES section.
FAAs Determination This product has been approved by the aviation authority of another country, and is approved for operation in the United States. Pursuant to the FAAs bilateral agreement with the State of Design Authority, the FAA has been notified of the unsafe condition described in the MCAI and service information referenced above. The FAA
is issuing this AD because the FAA
evaluated all pertinent information and determined the unsafe condition exists and is likely to exist or develop on other products of the same type design.
Requirements of This AD
This AD requires revising the existing airplane flight manual and applicable corresponding operational procedures to provide the flightcrew with procedures that require the engine bleeds to be ON during takeoff.
Explanation of Incorporating Information Specified in an AFM
Revision This AD requires including the information that is provided in the referenced AFM revision in paragraph g of this AD. The language in paragraph g of this AD is designed to allow incorporating the specific information, regardless of the revision level of the AFM in use, provided the language is identical to the referenced AFM revisions specified in paragraph g of this AD. The language in a later revision of the Challenger 300 Airplane Flight Manual, Publication No. CSP
1001 that is the same as the language in Challenger 300 Airplane Flight Manual, Publication No. CSP 1001, Revision 63, dated April 1, 2021, may be incorporated.

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FAAs Justification and Determination of the Effective Date An unsafe condition exists that requires the immediate adoption of this AD without providing an opportunity for public comments prior to adoption.
The FAA has found that the risk to the flying public justifies waiving notice and comment prior to adoption of this rule because engine surges during takeoff can result in significant loss of engine thrust or even engine shutdown and can occur on both engines at the same time. In addition, the compliance time for the required action is shorter than the time necessary for the public to comment and for publication of the final rule. Therefore, the FAA finds good cause that notice and opportunity for prior public comment are impracticable.
In addition, for the reasons stated above, the FAA finds that good cause exists for making this amendment effective in less than 30 days.
Comments Invited The FAA invites you to send any written relevant data, views, or arguments about this AD. Send your comments to an address listed under ADDRESSES. Include Docket No. FAA
20210342; Project Identifier MCAI
202001547T at the beginning of your comments. The most helpful comments reference a specific portion of the final rule, 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 this final rule 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 final rule.
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 AD 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 AD, it is important that you clearly designate the submitted comments as CBI. Please mark each page of your submission
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