Federal Register / Vol. 89, No. 15 / Tuesday, January 23, 2024 / Rules and Regulations 4179 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations or email fr.inspection@nara.gov. 

Issued on December 18, 2023. 

Victor Wicklund, 

Deputy Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–01169 Filed 1–22–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1890; Project 

Identifier MCAI–2023–00283–T; Amendment 

39–22645; AD 2023–26–02] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for all 

Bombardier, Inc., Model BD–100–1A10 

airplanes. This AD was prompted by 

reports from the supplier that some 

overheat detection sensing elements of 

the bleed air leak detection system were 

manufactured with insufficient salt fill, 

which can result in an inability to detect 

hot bleed air leaks. This AD requires 

revising the existing airplane flight 

manual (AFM) to include procedures to 

prevent takeoff with an active bleed air 

leak annunciated while on the ground. 

This AD also requires testing the 

overheat detection sensing elements, 

marking each serviceable sensing 

element with a witness mark, and 

replacing each nonserviceable part with 

a serviceable part. This AD also 

prohibits the installation of affected 

parts. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective February 27, 

2024. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of February 27, 2024. 

ADDRESSES: 

AD Docket: You may examine the AD 

docket at regulations.gov under Docket 

No. FAA–2023–1890; 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, the mandatory 

continuing airworthiness information 

(MCAI), 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. 

Material Incorporated by Reference: 

• For Bombardier service information 

identified in this final rule, contact 

Bombardier Business Aircraft Customer 

Response Center, 400 Coˆte-Vertu Road 

West, Dorval, Que ́bec H4S 1Y9, Canada; 

telephone 514–855–2999; email ac.yul@

aero.bombardier.com; website 

bombardier.com. 

• For Liebherr-Aerospace Toulouse 

SAS service information identified in 

this AD, contact Liebherr-Aerospace 

Toulouse SAS, 408, Avenue des EtatsUnis—B.P.52010, 31016 Toulouse 

Cedex, France; telephone +33 

(0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email 

techpub.toulouse@liebherr.com; website 

liebherr.aero. 

• You may view this service 

information at the FAA, Airworthiness 

Products Section, Operational Safety 

Branch, 2200 South 216th Street, Des 

Moines, WA. For information on the 

availability of this material at the FAA, 

call 206–231–3195. It is also available at 

regulations.gov under Docket No. FAA– 

2023–1890. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; 

telephone 516–228–7300; email 9-avsnyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to all Bombardier, Inc., Model 

BD–100–1A10 airplanes. The NPRM 

published in the Federal Register on 

September 29, 2023 (88 FR 67118). The 

NPRM was prompted by AD CF–2023– 

09, dated February 14, 2023, issued by 

Transport Canada, which is the aviation 

authority for Canada (referred to after 

this as the MCAI). The MCAI states that 

Bombardier received reports from the 

supplier of the overheat detection 

sensing elements of a manufacturing 

quality escape. Some of the sensing 

elements of the bleed air leak detection 

system were manufactured with 

insufficient salt fill. This condition can 

result in an inability to detect hot bleed 

air leaks, which can cause damage to 

surrounding structures and systems and 

prevent continued safe flight and 

landing. 

In the NPRM, the FAA proposed to 

require revising the existing AFM to 

include procedures to prevent takeoff 

with an active bleed air leak 

annunciated while on the ground. The 

FAA also proposed to require testing the 

overheat detection sensing elements, 

marking each serviceable sensing 

element with a witness mark, and 

replacing each nonserviceable part with 

a serviceable part. The FAA also 

proposed to prohibit the installation of 

affected parts. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

You may examine the MCAI in the 

AD docket at regulations.gov under 

Docket No. FAA–2023–1890. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from an 

anonymous commenter who has 

experience troubleshooting and 

maintaining environmental control 

systems (bleed air). No changes to the 

AD were requested. The commenter 

stated revising the AFM procedures will 

prevent costly maintenance and 

implementing extra safety features will 

also be cost effective and favor pilot 

safety. The FAA infers that the 

commenter supports the AD. 

Conclusion 

This product has been approved by 

the aviation authority of another 

country and is approved for operation in 

the United States. Pursuant to the FAA’s 

bilateral agreement with this State of 

Design Authority, it has notified the 

FAA of the unsafe condition described 

in the MCAI referenced above. The FAA 

reviewed the relevant data and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on this 

product. Except for minor editorial 

changes, this AD is adopted as proposed 

in the NPRM. None of the changes will 

increase the economic burden on any 

operator. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Liebherr Service 

Bulletin CFD–F1958–26–01, dated May 

6, 2022, which specifies part numbers 

for affected sensing elements. 

Bombardier has issued the following 

service information. This service 

information describes procedures to 

prevent the takeoff of an airplane with 

an active bleed air leak annunciated 

while on the ground. These documents 

are distinct since they apply to different 

airplane models. 


khammond on DSKJM1Z7X2PROD with RULES
4180 Federal Register / Vol. 89, No. 15 / Tuesday, January 23, 2024 / Rules and Regulations 

• Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 300 

AFM (Imperial Version), Publication 

No. CSP 100–1, Revision 71, dated 

November 9, 2022. (For obtaining the 

procedures for Bombardier Challenger 

300 AFM (Imperial Version), 

Publication No. CSP 100–1, use 

Document Identification No. CH 300 

AFM–I.) 

• Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 350 

AFM, Publication No. CH 350 AFM, 

Revision 37, dated November 9, 2022. 

(For obtaining the procedures for 

Bombardier Challenger 350 AFM, 

Publication No. CH 350 AFM, use 

Document Identification No. CH 350 

AFM.) 

The FAA also reviewed Bombardier 

Service Bulletin 100–36–10, dated 

December 23, 2022; and Bombardier 

Service Bulletin 350–36–003, dated 

December 23, 2022; which specify 

procedures for testing each leak 

detection loop sensing element installed 

on the airplane, marking each 

serviceable sensing element with a 

witness mark, and replacing each 

nonserviceable part with a serviceable 

part. 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 

The FAA estimates that this AD 

affects 317 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Labor cost Parts cost Cost per product Cost on U.S. operators 

Up to 77 work-hours × $85 per hour = $6,545 ............ $0 Up to $6,545 ................................... Up to $2,074,765. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition actions specified in 

this AD. The FAA estimates it would 

take up to 1.5 hours to replace one 

sensor. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this AD may be covered 

under warranty, thereby reducing the 

cost impact on affected operators. 

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. 

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. 

§ 39.13 [Amended] 

■ 2. The FAA amends § 39.13 by adding 

the following new airworthiness 

directive: 

2023–26–02 Bombardier, Inc.: Amendment 

39–22645; Docket No. FAA–2023–1890; 

Project Identifier MCAI–2023–00283–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective February 27, 2024. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all Bombardier, Inc., 

Model BD–100–1A10 airplanes, certificated 

in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code: 36, Pneumatic. 

(e) Unsafe Condition 

This AD was prompted by reports from the 

supplier that some overheat detection 

sensing elements of the bleed air leak 

detection system were manufactured with 

insufficient salt fill. The FAA is issuing this 

AD to address non-conforming sensing 

elements of the bleed air leak detection 

system. The unsafe condition, if not 

addressed, could result in an inability to 

detect hot bleed air leaks and consequent 

damage to surrounding structures and 

systems, which could prevent continued safe 

flight and landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Definitions 

(1) For purposes of this AD, an affected 

part is a sensing element marked with a date 

code A0448 through A2104 inclusive and 

having an LTS/Kidde part number specified 

in Liebherr Service Bulletin CFD–F1958–26– 

01, dated May 6, 2022, unless that sensing 

element meets the criteria specified in either 

paragraph (g)(1)(i) or (ii) of this AD. 

(i) The sensing element has been tested as 

specified in Section 3 of the Accomplishment 

Instructions of Kidde Aerospace and Defense 

Service Bulletin CFD–26–1, Revision 6, dated 

February 28, 2022, or earlier revisions, and 

has been found to be serviceable; and the 

sensing element has been marked on one face 

of its connector hex nut and packaged as 

specified in Section 3.C. of the 

Accomplishment Instructions of Kidde 

Aerospace and Defense Service Bulletin 

CFD–26–1, Revision 6, dated February 28, 

2022, or earlier revisions. 


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Federal Register / Vol. 89, No. 15 / Tuesday, January 23, 2024 / Rules and Regulations 4181 

(ii) The sensing element has been tested 

and found to be serviceable as specified in 

paragraph (i) of this AD; and the sensing 

element has been marked on one face of one 

connector hex nut with one green mark, as 

specified in Figure 11 of Bombardier Service 

Bulletin 100–36–10, dated December 23, 

2022, or Bombardier Service Bulletin 350– 

36–003, dated December 23, 2022, as 

applicable (the figure is representative for all 

sensing elements). 

(2) For purposes of this AD, a serviceable 

part is a sensing element that is not an 

affected part. 

(h) Revision of the Existing Airplane Flight 

Manual (AFM) 

For airplane serial numbers 20001 through 

20457 inclusive and 20501 through 20906 

inclusive: Within 30 days after the effective 

date of this AD, revise the existing AFM to 

include the information specified in 

paragraphs (h)(1) and (2) of this AD, as 

applicable. 

(1) For airplane serial numbers 20001 

through 20457 inclusive: Section 05–42, Air 

Conditioning & Pressurization, Non-Normal 

Procedures Section, Bombardier Challenger 

300 AFM (Imperial Version), Publication No. 

CSP 100–1, Revision 71, dated November 9, 

2022. 

Note 1 to Paragraph (h)(1): For obtaining 

the procedures for Bombardier Challenger 

300 AFM (Imperial Version), Publication No. 

CSP 100–1, use Document Identification No. 

CH 300 AFM–I. 

(2) For airplane serial numbers 20501 

through 20906 inclusive: Section 05–42, 

Airconditioning & Pressurization, NonNormal Procedures Section, Bombardier 

Challenger 350 AFM, Publication No. CH 350 

AFM, Revision 37, dated November 9, 2022. 

Note 2 to Paragraph (h)(2): For obtaining 

the procedures for Bombardier Challenger 

350 AFM, Publication No. CH 350 AFM, use 

Document Identification No. CH 350 AFM. 

(i) Testing of Overheat Detection Sensing 

Elements 

For airplane serial numbers 20001 through 

20457 inclusive and 20501 through 20906 

inclusive: Within 7,500 flight cycles or 96 

months, whichever occurs first, from the 

effective date of this AD, test the overheat 

detection sensing elements to determine if 

they are serviceable, in accordance with the 

Accomplishment Instructions of Bombardier 

Service Bulletin 100–36–10, dated December 

23, 2022; or Bombardier Service Bulletin 

350–36–003, dated December 23, 2022, as 

applicable. 

(1) For each sensing element that is 

serviceable, before further flight, mark the 

sensing element with a witness mark in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–36–10, dated December 23, 2022; or 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; as applicable. 

(2) For each sensing element that is not 

serviceable, before further flight, replace the 

sensing element with a serviceable part in 

accordance with the Accomplishment 

Instructions of Bombardier Service Bulletin 

100–36–10, dated December 23, 2022; or 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; as applicable. 

(j) Parts Installation Prohibition 

As of the effective date of this AD, no 

person may install an affected part on any 

airplane. 

(k) No Reporting Requirement 

Although Bombardier Service Bulletin 

100–36–10, dated December 23, 2022; and 

Bombardier Service Bulletin 350–36–003, 

dated December 23, 2022; specify to submit 

certain information to the manufacturer, this 

AD does not include that requirement. 

(l) Additional AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, International 

Validation Branch, FAA, has the authority to 

approve AMOCs for this AD, if requested 

using the procedures found in 14 CFR 39.19. 

In accordance with 14 CFR 39.19, send your 

request to your principal inspector or 

responsible Flight Standards Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, mail it to the address identified in 

paragraph (m)(2) of this AD. Information may 

be emailed to: 9-AVS-NYACO-COS@faa.gov. 

Before using any approved AMOC, notify 

your appropriate principal inspector, or 

lacking a principal inspector, the manager of 

the responsible Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, International Validation 

Branch, FAA; or Transport Canada; or 

Bombardier, Inc.’s Transport Canada Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(m) Additional Information 

(1) Refer to Transport Canada AD CF– 

2023–09, dated February 14, 2023, for related 

information. This Transport Canada AD may 

be found in the AD docket at regulations.gov 

under Docket No. FAA–2023–1890. 

(2) For more information about this AD, 

contact Steven Dzierzynski, Aviation Safety 

Engineer, FAA, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 516– 

228–7300; email 9-avs-nyaco-cos@faa.gov. 

(n) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless this AD specifies otherwise. 

(i) Bombardier Service Bulletin 100–36–10, 

dated December 23, 2022. 

(ii) Bombardier Service Bulletin 350–36– 

003, dated December 23, 2022. 

(iii) Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 300 AFM 

(Imperial Version), Publication No. CSP 100– 

1, Revision 71, dated November 9, 2022. 

Note 3 to Paragraph (n)(2)(iii): For 

obtaining the procedures for Bombardier 

Challenger 300 AFM (Imperial Version), 

Publication No. CSP 100–1, use Document 

Identification No. CH 300 AFM–I. 

(iv) Section 05–42, Air Conditioning & 

Pressurization, Non-Normal Procedures 

Section, Bombardier Challenger 350 AFM, 

Publication No. CH 350 AFM, Revision 37, 

dated November 9, 2022. 

Note 4 to Paragraph (n)(2)(iv): For 

obtaining the procedures for Bombardier 

Challenger 350 AFM, Publication No. CH 350 

AFM, use Document Identification No. CH 

350 AFM. 

(v) Liebherr Service Bulletin CFD–F1958– 

26–01, dated May 6, 2022. 

(3) For Bombardier service information 

identified in this AD, contact Bombardier 

Business Aircraft Customer Response Center, 

400 Coˆte-Vertu Road West, Dorval, Que ́bec 

H4S 1Y9, Canada; telephone 514–855–2999; 

email ac.yul@aero.bombardier.com; website 

bombardier.com. 

(4) For Liebherr-Aerospace Toulouse SAS 

service information identified in this AD, 

contact Liebherr-Aerospace Toulouse SAS, 

408, Avenue des Etats-Unis—B.P.52010, 

31016 Toulouse Cedex, France; telephone 

+33 (0)5.61.35.28.28; fax +33 

(0)5.61.35.29.29; email techpub.toulouse@

liebherr.com; website liebherr.aero. 

(5) You may view this service information 

at the FAA, Airworthiness Products Section, 

Operational Safety Branch, 2200 South 216th 

Street, Des Moines, WA. For information on 

the availability of this material at the FAA, 

call 206–231–3195. 

(6) You may view this material at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

visit www.archives.gov/federal-register/cfr/ 

ibr-locations, or email fr.inspection@

nara.gov. 

Issued on December 21, 2023. 

Caitlin Locke, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2024–01170 Filed 1–22–24; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2023–1811; Project 

Identifier MCAI–2023–00146–E; Amendment 

39–22654; AD 2024–01–03] 

RIN 2120–AA64 

Airworthiness Directives; GE Aviation 

Czech s.r.o. (Type Certificate 

Previously Held by WALTER Engines 

a.s., Walter a.s., and MOTORLET a.s.) 

Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2023–01– 


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