Document ID: FAA-2021-0298-0005
Agency: faa
Document Type: Proposed Rule
Title: Airworthiness Directives: Airbus Canada Limited Partnership (Type Certificate Previously Held by C Series Aircraft Limited Partnership (CSALP); Bombardier, Inc.) Airplanes
Posted Date: 2021-08-25T04:00Z

[Federal Register Volume 86, Number 162 (Wednesday, August 25, 2021)]
[Proposed Rules]
[Pages 47419-47420]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-18228]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0298; Project Identifier MCAI-2020-01549-T]
RIN 2120-AA64

Airworthiness Directives; Airbus Canada Limited Partnership (Type 
Certificate Previously Held by C Series Aircraft Limited Partnership 
(CSALP); Bombardier, Inc.) Airplanes

AGENCY: Federal Aviation Administration (FAA), DOT.

ACTION: Proposed rule; withdrawal.

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SUMMARY: The FAA is withdrawing a notice of proposed rulemaking (NPRM) 
that proposed to adopt a new airworthiness directive (AD) that would 
have applied to certain Airbus Canada Limited Partnership Model BD-500-
1A10 airplanes. The NPRM would have required an inspection of the low-
pressure distribution supply duct to determine the part number, and 
replacement if necessary, as specified in a Transport Canada Civil 
Aviation (TCCA) AD. Since issuance of the NPRM, the FAA has determined 
that the affected operator has already addressed the unsafe condition 
by incorporating the proposed required actions on the affected 
airplanes. Accordingly, the NPRM is withdrawn.

DATES: As of August 25, 2021, the proposed rule, which was published in

[[Page 47420]]

the Federal Register on April 16, 2021 (86 FR 20091), is withdrawn.

ADDRESSES: 

Examining the AD Docket

    You may examine the AD docket at https://www.regulations.gov by 
searching for and locating Docket No. FAA-2021-0298; 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 AD action, any 
comments received, and other information. The street address for Docket 
Operations is U.S. Department of Transportation, Docket Operations, M-
30, West Building Ground Floor, Room W12-140, 1200 New Jersey Avenue 
SE, Washington, DC 20590.

FOR FURTHER INFORMATION CONTACT: Siddeeq Bacchus, Aerospace Engineer, 
Mechanical Systems and Administrative Services Section, FAA, New York 
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590; 
telephone 516-228-7362; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Background

    The FAA issued an NPRM that proposed to amend 14 CFR part 39 by 
adding an AD that would apply to certain Airbus Canada Limited 
Partnership Model BD-500-1A10 airplanes. The NPRM was published in the 
Federal Register on April 16, 2021 (86 FR 20091). The NPRM was prompted 
by a report that an incorrect low-pressure distribution supply duct may 
be installed in the forward cargo compartment. The NPRM proposed to 
require an inspection of the low-pressure distribution supply duct to 
determine the part number, and replacement if necessary, as specified 
in a Transport Canada Civil Aviation (TCCA) AD.

Actions Since the NPRM Was Issued

    Since issuance of the NPRM, the FAA has verified that the proposed 
actions have been done on the affected airplanes. Therefore, the FAA 
has determined that AD action is not appropriate.
    Withdrawal of the NPRM constitutes only such action and does not 
preclude the FAA from further rulemaking on this issue, nor does it 
commit the FAA to any course of action in the future.

Comments

Support for the NPRM

    The Air Line Pilots Association, International (ALPA) expressed 
support for the NPRM.

Request To Not Issue the Proposed AD

    Delta Air Lines (Delta) requested that the proposed AD not be 
issued. DAL stated that replacement of the affected part as required by 
the proposed AD had already been done on both of the affected 
airplanes. Alternatively, Delta requested that the FAA allow use of the 
high-pressure ground connection as an alternative to the auxiliary 
power units because Delta's affected airplanes had been preserved in 
storage and could not be started if necessary to perform a required 
leak check. The FAA agrees with the commenter's requests, but because 
the FAA is withdrawing the NPRM, Delta's alternative request is no 
longer necessary.

FAA's Conclusions

    Upon further consideration, the FAA has determined that the NPRM is 
unnecessary. Accordingly, the NPRM is withdrawn.

Regulatory Findings

    Since this action only withdraws an NPRM, it is neither a proposed 
nor a final rule. This action therefore is not covered under Executive 
Order 12866, the Regulatory Flexibility Act, or DOT Regulatory Policies 
and Procedures (44 FR 11034, February 26, 1979).

List of Subjects in 14 CFR Part 39

    Air transportation, Aircraft, Aviation safety, Incorporation by 
reference, Safety.

The Withdrawal

    Accordingly, the notice of proposed rulemaking (Docket No. FAA-
2021-0298), which was published in the Federal Register on April 16, 
2021 (86 FR 20091), is withdrawn.

    Issued on August 19, 2021.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness 
Division, Aircraft Certification Service.
[FR Doc. 2021-18228 Filed 8-24-21; 8:45 am]
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