DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2020-0203; Product Identifier 2019-NM-142-AD; Amendment
39-21256; AD 2020-19-13]
RIN 2120-AA64

Airworthiness Directives; Bombardier, Inc., Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601),
and CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes. This AD
was prompted by a report that fast and easy access to the portable
oxygen bottle may be prevented by the portable oxygen bottle
installation's upper bracket latch assembly catching on the pressure
gauge tube or on the pressure gauge bezel of the portable oxygen
bottle. This AD requires a check to identify the manufacturer and part
number of the portable oxygen bottle installation, and, if necessary,
modification of the portable oxygen bottle installation. The FAA is
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective November 3, 2020.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of November 3,
2020.

ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 C[ocirc]te-Vertu Road West, Dorval,
Quebec H4S 2A3, Canada; North America toll-free telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; 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 206-231-3195. It is also available on the internet at
https://www.regulations.gov by searching for and locating Docket No.
FAA-2020-0203.

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. FAA-2020-
0203; 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 W12-140, 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 516-228-7323; fax 516-794-5531; email 9-avs-nyaco-cos@faa.gov.

SUPPLEMENTARY INFORMATION:

Discussion

Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2019-26, dated July 9,
2019 (also referred to as the Mandatory Continuing Airworthiness
Information, or ``the MCAI''), to correct an unsafe condition for
certain Bombardier, Inc., Model CL-600-1A11 (600), CL-600-2A12 (601),
and CL-600-2B16 (601-3A, 601-3R, and 604 Variants) 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. FAA-2020-0203.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain Bombardier,
Inc., Model CL-600-1A11 (600), CL-600-2A12 (601), and CL-600-2B16 (601-
3A, 601-3R, and 604 Variants) airplanes. The NPRM published in the
Federal Register on March 23, 2020 (85 FR 16284). The NPRM was prompted
by a report that fast and easy access to the portable oxygen bottle may
be prevented by the portable oxygen bottle installation's upper bracket
latch assembly catching on the pressure gauge tube or on the pressure
gauge bezel of the portable oxygen bottle. The NPRM proposed to require
a check to identify the manufacturer and part number of the portable
oxygen bottle installation, and, if necessary, modification of the
portable oxygen bottle installation. The FAA is issuing this AD to
address the portable oxygen bottle installation's upper bracket latch
assembly catching on the pressure gauge tube or on the pressure gauge
bezel of the portable oxygen bottle, which, if not detected and
corrected, could prevent fast and easy access to the portable oxygen
bottle in an emergency situation. 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 comment received
on the NPRM and the FAA's response to each comment.

Support for the NPRM

An anonymous commenter had no objection to the NPRM.

Request To Revise or Clarify the Applicability of Paragraph (i) of the
Proposed AD

NetJets requested that the FAA either revise the language in the
first sentence of paragraph (i) of the proposed AD to clearly state
that the paragraph applies to airplanes having a serial number of 6119
and below that is not listed in section 1.A. of the applicable
Bombardier service information specified in figure 1 to paragraphs (g),
(h), and (i) of the proposed AD, or that the FAA clarify paragraph
(c)(3) of the proposed AD to state that all serial numbers are
affected.
The FAA agrees to clarify. Paragraph (i) of the proposed AD is
applicable to only airplanes having the serial numbers specified in
paragraph (c) of this AD, but not listed in section 1.A. of the
applicable Bombardier service information specified in figure 1 to
paragraphs (g), (h), and (i) of this AD, and equipped with specified
part numbers of Scott (Avox/Zodiac) 5500 or 5600 series 11 cubic foot
portable oxygen bottle(s). As such, any serial number not specified in
paragraph (c)(3) of this AD for Bombardier Inc. Model CL-600-2B16 (601-
3A, 601-3R, and 604 Variants) airplanes, is not affected by paragraph
(i) of this AD. The FAA has not changed this AD in this regard.

Conclusion

The FAA reviewed the relevant data, considered the comments
received, and determined that air safety and the public interest
require adopting this final rule as proposed, except for minor
editorial changes. The FAA has determined that these minor changes:
Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
Do not add any additional burden upon the public than was
already proposed in the NPRM.

Related Service Information Under 1 CFR Part 51

Bombardier has issued the following service information:
Bombardier Service Bulletin 600-0772, dated June 29, 2018;
Bombardier Service Bulletin 601-0646, dated June 29, 2018;
Bombardier Service Bulletin 604-35-006, dated June 29,
2018;
Bombardier Service Bulletin 605-35-005, dated June 29,
2018; and
Bombardier Service Bulletin 650-35-001, dated June 29,
2018.
This service information describes procedures for a check to
identify the manufacturer and part number of the portable oxygen bottle
installation, and, if necessary, modification of the portable oxygen
bottle installation. These documents are distinct since they apply to
different airplane models. 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.

Costs of Compliance

We estimate that this AD affects 188 airplanes of U.S. registry. We
estimate the following costs to comply with this AD:

Estimated Costs for Required Actions

Authority for This Rulemaking

Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.

Regulatory Findings

This AD will not have federalism implications under Executive Order
13132. This AD will not have a substantial direct effect on the States,
on the relationship between the national government and the States, or
on the distribution of power and responsibilities among the various
levels of government.
For the reasons discussed above, I certify that this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Will not affect intrastate aviation in Alaska, and
(3) Will not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.

List of Subjects in 14 CFR Part 39

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

Adoption of the Amendment

Accordingly, under the authority delegated to me by the
Administrator, the FAA amends 14 CFR part 39 as follows:

PART 39--AIRWORTHINESS DIRECTIVES

1. The authority citation for part 39 continues to read as follows:

Authority: 49 U.S.C. 106(g), 40113, 44701.

Sec. 39.13 [Amended]

2. The FAA amends Sec. 39.13 by adding the following new airworthiness
directive (AD):