2024-31379. Airworthiness Directives; Bombardier, Inc., Airplanes

Estimated Costs for Required Actions

Labor cost	Parts cost	Cost per product	Cost on U.S. operators
3 work-hours × $85 per hour = $255	$1,530	$1,785	$342,720

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

The FAA determined that this proposed AD would not have federalism implications under Executive Order 13132. This proposed AD would 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 this proposed regulation:

(1) Is not a “significant regulatory action” under Executive Order 12866,

(2) Would not affect intrastate aviation in Alaska, and

(3) Would 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

The Proposed Amendment

Accordingly, under the authority delegated to me by the Administrator, the FAA proposes to amend 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.

§ 39.13

[Amended]

2. The FAA amends § 39.13 by:

a. Removing Airworthiness Directive (AD) 2020-19-13, Amendment 39-21256 ( 85 FR 60887, September 29, 2020); and

b. Adding the following new AD:

Bombardier, Inc.: Docket No. FAA-2024-2717; Project Identifier MCAI-2024-00147-T.

(a) Comments Due Date

The FAA must receive comments on this airworthiness directive (AD) by February 14, 2025.

(b) Affected ADs

This AD replaces AD 2020-19-13, Amendment 39-21256 (85 FR 60887, September 29, 2020) (AD 2020-19-13).

(c) Applicability

This AD applies to Bombardier, Inc., airplanes, identified in paragraphs (c)(1) through (3), certificated in any category, equipped with Scott (Avox/Zodiac) 5500 or 5600 series 11 cubic foot portable oxygen bottle(s) with upper bracket part number (P/N) 36758-02, P/N 36758-12 or P/N H3-2091-1 installed at the neck of the bottle(s).

(1) Model CL-600-1A11 (600) airplanes, serial numbers 1004 through 1085 inclusive.

(2) Model CL-600-2A12 (601) airplanes, serial numbers 3001 through 3066 inclusive.

(3) Model CL-600-2B16 (601-3A, 601-3R, and 604 Variants) airplanes, serial numbers 5001 through 5194 inclusive, 5301 through 5665 inclusive, 5701 through 5988 inclusive, 6050 through 6119 inclusive, 6158, 6161, 6176, and 6181.

(d) Subject

Air Transport Association (ATA) of America Code 35, Oxygen.

(e) Unsafe Condition

This AD was prompted by a report indicating that the portable oxygen bottle installation's upper bracket latch assembly can catch on the pressure gauge tube or on the pressure gauge bezel of the portable oxygen bottle. This AD was also prompted by the determination that four additional Model CL-600-2B16 airplanes may be subject to the unsafe condition. The FAA is issuing this AD to address the unsafe condition, which, if not addressed, could prevent fast and easy access to the portable oxygen bottle in an emergency situation.

(f) Compliance

Comply with this AD within the compliance times specified, unless already done.

(g) Retained Check for Airplanes, With Revised Figure Reference and Revised Service Information

This paragraph restates the requirements of paragraph (g) of AD 2020-19-13, with revised figure reference and revised service information. For airplanes with a serial number (S/N) listed in Section 1.A. of the applicable Bombardier service information specified in figure 1 to paragraph (g) of this AD, except airplane S/Ns 6158, 6161, 6176, and 6181: Within 60 months after November 3, 2020 (the effective date of AD 2020-19-13), check each portable oxygen bottle installation to determine the manufacturer and P/N, in accordance with paragraph 2.B. of the Accomplishment Instructions of the applicable Bombardier service information specified in figure 1 to paragraph (g) of this AD.

Figure 1 to Paragraph ( g )—Service Information References

Airplane model	Bombardier service information
Model CL-600-1A11	Bombardier Service Bulletin 600-0772, Revision 01, dated June 28, 2023.
Model CL-600-2A12	Bombardier Service Bulletin 601-0646, Revision 01, dated June 28, 2023.
Model CL-600-2B16	Bombardier Service Bulletin 601-0646, Revision 01, dated June 28, 2023.
Model CL-600-2B16	Bombardier Service Bulletin 604-35-006, Revision 01, dated June 28, 2023.
( print page 107072)
Model CL-600-2B16	Bombardier Service Bulletin 605-35-005, Revision 01, dated June 28, 2023.
Model CL-600-2B16	Bombardier Service Bulletin 650-35-001, Revision 01, dated June 28, 2023.