Federal Register / Vol. 87, No. 80 / Tuesday, April 26, 2022 / Rules and Regulations 24407 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(l) Related Information 

For more information about this AD, 

contact Hal Jensen, Aerospace Engineer, 

Operational Safety Branch, Compliance & 

Airworthiness Division, FAA, 950 L’Enfant 

Plaza N SW, Washington, DC 20024; 

telephone (202) 267–9167; email hal.jensen@

faa.gov. 

(m) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 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) European Union Aviation Safety Agency 

(EASA) AD 2021–0171, dated July 19, 2021. 

(ii) [Reserved] 

(3) For EASA AD 2021–0171, contact 

EASA, Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; telephone +49 221 8999 

000; email ADs@easa.europa.eu; internet 

www.easa.europa.eu. You may find the 

EASA material on the EASA website at 

https://ad.easa.europa.eu. 

(4) You may view this service information 

at the FAA, Office of the Regional Counsel, 

Southwest Region, 10101 Hillwood Pkwy., 

Room 6N–321, Fort Worth, TX 76177. For 

information on the availability of this 

material at the FAA, call (817) 222–5110. 

This material may be found in the AD docket 

at https://www.regulations.gov by searching 

for and locating Docket No. FAA–2022–0102. 

(5) You may view this material that is 

incorporated by reference at the National 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, email 

fr.inspection@nara.gov, or go to: https://

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on April 14, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–08803 Filed 4–25–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–1164; Project 

Identifier MCAI–2021–00975–E; Amendment 

39–22019; AD 2022–08–16] 

RIN 2120–AA64 

Airworthiness Directives; Rolls-Royce 

Deutschland Ltd & Co KG (Type 

Certificate Previously Held by RollsRoyce Plc) Turbofan Engines 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is superseding 

Airworthiness Directive (AD) 2020–20– 

07 for certain Rolls-Royce Deutschland 

Ltd & Co KG (RRD) Trent 1000–AE3, 

Trent 1000–CE3, Trent 1000–D3, Trent 

1000–G3, Trent 1000–H3, Trent 1000– 

J3, Trent 1000–K3, Trent 1000–L3, Trent 

1000–M3, Trent 1000–N3, Trent 1000– 

P3, Trent 1000–Q3, Trent 1000–R3, 

Trent 7000–72, and Trent 7000–72C 

model turbofan engines. AD 2020–20– 

07 required initial and repetitive 

borescope inspections (BSIs) or visual 

inspections of the intermediate-pressure 

compressor (IPC) shaft assembly and, 

depending on the results of the 

inspection, replacement of the IPC shaft 

assembly. This AD was prompted by the 

manufacturer providing optional 

terminating actions for the required 

repetitive inspections and alternative 

inspection instructions. This AD 

continues to require initial and 

repetitive BSIs but allows modification 

of the engine in accordance with RRD 

service information as a terminating 

action to these inspections, as specified 

in a European Union Aviation Safety 

Agency (EASA) AD, which is 

incorporated by reference. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective May 31, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of May 31, 2022. 

ADDRESSES: For material incorporated 

by reference in this AD, contact EASA, 

Konrad-Adenauer-Ufer 3, 50668 

Cologne, Germany; phone: +49 221 8999 

000; email: ADs@easa.europa.eu. You 

may find this material on the EASA 

website at https://ad.easa.europa.eu. 

You may view this material at the FAA, 

Airworthiness Products Section, 

Operational Safety Branch, 1200 District 

Avenue, Burlington, MA 01803. For 

information on the availability of this 

material at the FAA, call (817) 222– 

5110. It is also available at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

1164. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–1164; 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 EASA AD, 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: 

Nicholas Paine, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7116; email: 

nicholas.j.paine@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2019– 

0282R1, dated August 25, 2021 (EASA 

AD 2019–0282R1), to address an unsafe 

condition for all RRD Trent 1000–AE3, 

Trent 1000–CE3, Trent 1000–D3, Trent 

1000–G3, Trent 1000–H3, Trent 1000– 

J3, Trent 1000–K3, Trent 1000–L3, Trent 

1000–M3, Trent 1000–N3, Trent 1000– 

P3, Trent 1000–Q3, Trent 1000–R3, 

Trent 7000–72, and Trent 7000–72C 

model turbofan engines. The EASA AD 

includes exceptions that limit the 

applicability for certain engines. 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 to supersede AD 2020–20–07, 

Amendment 39–21263 (85 FR 62975, 

October 6, 2020), (AD 2020–20–07). AD 

2020–20–07 applied to all RRD Trent 

1000–AE3, Trent 1000–CE3, Trent 

1000–D3, Trent 1000–G3, Trent 1000– 

H3, Trent 1000–J3, Trent 1000–K3, 

Trent 1000–L3, Trent 1000–M3, Trent 

1000–N3, Trent 1000–P3, Trent 1000– 

Q3, Trent 1000–R3, Trent 7000–72, and 

Trent 7000–72C model turbofan 

engines. The NPRM published in the 

Federal Register on December 28, 2021 

(86 FR 73690). The NPRM was 

prompted by a report of crack findings 

in the front air seal on the IPC shaft 

assembly during the stripping of a flight 

test engine. The NPRM was also 

prompted by the manufacturer’s 

publication of service information that 

provides optional terminating actions 

for the required repetitive inspections 

and alternative inspection instructions. 

In the NPRM, the FAA proposed to 

continue to require initial and repetitive 

BSIs of the IPC shaft assembly. In the 

NPRM, the FAA also proposed to 

require compliance with the required 

actions from November 10, 2020, the 

effective date of AD 2020–20–07. In the 

NPRM, the FAA also proposed to allow 

modification of the engine in 

accordance with Rolls-Royce service 

information as a terminating action to 

the initial and repetitive BSIs of the IPC 

shaft assembly. In the NPRM, the FAA 

also proposed to require accomplishing 


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24408 Federal Register / Vol. 87, No. 80 / Tuesday, April 26, 2022 / Rules and Regulations 

the actions specified in EASA AD 2019– 

0282R1, described previously, as 

incorporated by reference, except for 

any differences identified as exceptions 

in the regulatory text of this AD. The 

FAA is issuing this AD to address the 

unsafe condition on these products. See 

EASA AD 2019–0282R1 for additional 

background information. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received comments from 

two commenters. The commenters were 

Delta Air Lines, Inc. (DAL), and The 

Boeing Company (Boeing). The 

following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request To Reevaluate the Need for 

This FAA AD 

DAL requested that the FAA 

reevaluate the need for the proposed 

AD. DAL noted that after EASA revised 

EASA AD 2019–0282, RRD requested, 

and the FAA granted, a global 

Alternative Methods of Compliance 

(AMOC) that includes the changes in 

EASA AD 2019–0282R1. DAL reasoned 

that the regulatory requirements in the 

proposed NPRM are captured by AD 

2020–20–07 and the global AMOC. 

The FAA disagrees with withdrawing 

the NPRM. Issuing this AD addresses 

the unsafe condition, incorporates an 

optional terminating action, and 

incorporates by reference the required 

actions and compliance times specified 

in EASA AD 2019–0282R1. The FAA 

did not change the AD as a result of this 

comment. 

Request To Recognize AMOCs 

Approved for AD 2020–20–07 

DAL requested that the FAA update 

paragraph (i) of this AD to recognize 

AMOCs previously approved under AD 

2020–20–07. DAL received an FAAapproved AMOC to AD 2020–20–07 for 

deviations in the on-wing inspection 

procedure, material, and tooling as 

specified in Rolls-Royce Trent 1000 

Alert NMSB 72–AK451, Initial Issue, 

dated November 14, 2019. DAL used 

this AMOC to comply with AD 2020– 

20–07 and will need to continue to use 

the provisions in this AMOC to comply 

with this AD. DAL reasoned that since 

the AD retains all the requirements of 

AD 2020–20–07, AMOCs granted for AD 

2020–20–07 should also be applicable to 

this AD. 

The FAA agrees and has revised 

paragraph (i) of this AD to include that 

AMOCs approved previously for AD 

2020–20–07 are approved as AMOCs for 

the corresponding provisions of this AD. 

Support for the AD 

Boeing expressed support for the AD 

as written. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comments received, and 

determined that air safety requires 

adopting this AD as proposed. 

Accordingly, the FAA is issuing this AD 

to address the unsafe condition on these 

products. Except for minor editorial 

changes, and any other changes 

described previously, 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 EASA AD 2019– 

0282R1. EASA AD 2019–0282R1 

describes actions for initial and 

repetitive BSIs of the IPC shaft 

assembly. This material is reasonably 

available because the interested parties 

have access to it through their normal 

course of business or by the means 

identified in ADDRESSES. 

Other Related Service Information 

The FAA reviewed Rolls-Royce Trent 

1000 Alert Non-Modification Service 

Bulletin (NMSB) 72–AK451, Revision 1, 

dated July 15, 2021 (Rolls-Royce Trent 

1000 Alert NMSB 72–AK451); RollsRoyce Trent 1000 SB 72–K570; and 

Rolls-Royce Trent 1000 SB 72–K571. 

Rolls-Royce Trent 1000 Alert NMSB 

72–AK451 describes procedures for 

initial and repetitive BSIs of the IPC 

shaft assembly. Rolls-Royce Trent 1000 

SB 72–K570 and Rolls-Royce Trent 1000 

SB 72–K571, differentiated by engine 

model, describe procedures for the 

modification of the engine as a 

terminating action to the initial and 

repetitive BSIs of the IPC shaft 

assembly. 

Costs of Compliance 

The FAA estimates that this AD 

affects 22 engines installed on airplanes 

of U.S. Registry. 

The FAA estimates the following 

costs to comply with this AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

BSI or visual inspection of IPC shaft assembly.3.5 work-hours × $85 per hour = $297.50 ..... $0 $297.50 $6,545 

The FAA estimates the following 

costs to do any necessary replacement 

that is required based on the results of 

the inspection. The agency has no way 

of determining the number of aircraft 

that might need this replacement: 

ON-CONDITION COSTS

Action Labor cost Parts cost Cost per 

product 

Replace IPC shaft assembly ........................................ 1,080 work-hours × $85 per hour = $91,800 ............... $1,365,219 $1,457,019 

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 


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Federal Register / Vol. 87, No. 80 / Tuesday, April 26, 2022 / Rules and Regulations 24409 

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: 

■ a. Removing Airworthiness Directive 

2020–20–07, Amendment 39–21263 (85 

FR 62975, October 6, 2020); and 

■ b. Adding the following new 

airworthiness directive: 

2022–08–16 Rolls-Royce Deutschland Ltd & 

Co KG (Type Certificate previously held 

by Rolls-Royce plc): Amendment 39– 

22019; Docket No. FAA–2021–1164; 

Project Identifier MCAI–2021–00975–E. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective May 31, 2022. 

(b) Affected ADs 

This AD replaces AD 2020–20–07, 

Amendment 39–21263 (85 FR 62975, October 

6, 2020) (AD 2020–20–07). 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd & Co KG (RRD) Trent 1000– 

AE3, Trent 1000–CE3, Trent 1000–D3, Trent 

1000–G3, Trent 1000–H3, Trent 1000–J3, 

Trent 1000–K3, Trent 1000–L3, Trent 1000– 

M3, Trent 1000–N3, Trent 1000–P3, Trent 

1000–Q3, Trent 1000–R3, Trent 7000–72, and 

Trent 7000–72C model turbofan engines 

installed as identified in European Union 

Aviation Safety Agency (EASA) AD 2019– 

0282R1, dated August 25, 2021 (EASA AD 

2019–0282R1). 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code 7230, Turbine Engine Compressor 

Section. 

(e) Unsafe Condition 

This AD was prompted by a report of crack 

findings in the front air seal on the 

intermediate-pressure compressor (IPC) shaft 

assembly during the stripping of a flight test 

engine. The FAA is issuing this AD to 

prevent failure of the IPC shaft assembly. The 

unsafe condition, if not addressed, could 

result in loss of thrust control and reduced 

control of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Except as specified in paragraph (h) of this 

AD: Perform all required actions within the 

compliance times specified in, and in 

accordance with, EASA AD 2019–0282R1. 

(h) Exceptions to EASA AD 2019–0282R1 

(1) Where EASA AD 2019–0282R1 requires 

compliance from November 27, 2019, the 

effective date of EASA AD 2019–0282, this 

AD requires compliance from November 10, 

2020, the effective date of FAA AD 2020–20– 

07. 

(2) Where EASA AD 2019–0282R1 requires 

contacting Rolls-Royce for approved 

corrective actions if a crack is detected 

during any on-wing inspection and in-shop 

inspection, this AD requires removing the 

IPC shaft assembly and replacing it with a 

part eligible for installation before further 

flight. 

(3) Where EASA AD 2019–0282R1 defines 

a serviceable part as an IPC shaft assembly 

which is not an affected part; or an affected 

part which is new (never previously installed 

on an engine); or an affected part that, before 

(re)installation, has passed (no crack 

detected) an inspection in accordance with 

the instructions of the NMSB, this AD also 

includes in that definition an IPC shaft 

assembly that, before (re)installation, has 

passed a visual inspection (no crack 

detected) of the exposed part using FAAapproved maintenance procedures. 

(4) Where EASA AD 2019–0282R1 

references on-wing inspections, this AD 

allows for a visual inspection of the IPC shaft 

assembly using FAA-approved maintenance 

procedures as a substitute for any on-wing 

borescope inspection if the affected part is 

exposed, provided that the compliance times 

specified in this AD are not exceeded. 

(5) This AD does not mandate compliance 

with the ‘‘Remarks’’ section of EASA AD 

2019–0282R1. 

(i) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, ECO 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 local Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the ECO Branch, send it to 

the attention of the person identified in 

paragraph (j)(1) of this AD. Information may 

be emailed to: ANE-AD-AMOC@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the local flight standards district office/ 

certificate holding district office. 

(3) AMOCs approved previously for AD 

2020–20–07 are approved as AMOCs for the 

corresponding provisions of this AD. 

(j) Related Information 

(1) For more information about this AD, 

contact Nicholas Paine, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

Avenue, Burlington, MA 01803; phone: (781) 

238–7116; email: nicholas.j.paine@faa.gov. 

(2) For service information identified in 

this AD that is not incorporated by reference, 

contact Rolls-Royce plc, Corporate 

Communications, P.O. Box 31, Derby, DE24 

8BJ, United Kingdom; phone: +44 (0)1332 

242424 fax: +44 (0)1332 249936; website: 

https://www.rolls-royce.com/contact-us.aspx. 

You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 1200 District Avenue, 

Burlington, MA 01803. For information on 

the availability of this material at the FAA, 

call (817) 222–5110. 

(k) 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) European Union Aviation Safety Agency 

(EASA) AD 2019–0282R1, dated August 25, 

2021. 

(ii) [Reserved] 

(3) For more information about EASA AD 

2019–0282R1, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, Germany; 

phone: +49 221 8999 000; email: ADs@

easa.europa.eu. You may find this material 

on the EASA website at https://

ad.easa.europa.eu. 

(4) You may view this material at the FAA, 

Airworthiness Products Section, Operational 

Safety Branch, 1200 District Avenue, 

Burlington, MA 01803. For information on 

the availability of this material at the FAA, 

call (817) 222–5110. This material may be 

found in the AD docket at https://

www.regulations.gov by searching for and 

locating Docket No. FAA–2021–1164. 

(5) You may view this material that is 

incorporated by reference at the National 


jspears on DSK121TN23PROD with RULES1
24410 Federal Register / Vol. 87, No. 80 / Tuesday, April 26, 2022 / Rules and Regulations 

Archives and Records Administration 

(NARA). For information on the availability 

of this material at NARA, email 

fr.inspection@nara.gov, or go to https://

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on April 8, 2022. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–08837 Filed 4–25–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2022–0090; Project 

Identifier MCAI–2021–00399–T; Amendment 

39–22021; AD 2022–09–01] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

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 of smoke in the aft 

cabin during a maintenance activity, 

which an investigation determined was 

caused by a faulty drain line ribbon 

heater. This AD requires a general visual 

inspection of all affected potable waterline ribbon heater installations and 

corrective actions and other specified 

actions. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective May 31, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of May 31, 2022. 

ADDRESSES: For 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; internet http://

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–2022–0090. 

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–2022– 

0090; 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. 

FOR FURTHER INFORMATION CONTACT: 

Thomas Niczky, Aerospace Engineer, 

Avionics and Electrical Systems 

Section, FAA, New York ACO Branch, 

1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516– 

228–7347; 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 TCCA AD CF– 

2021–13, dated April 1, 2021 (TCCA AD 

CF–2021–13) (also referred to as the 

MCAI), to correct an unsafe condition 

for Bombardier, Inc., Model CL–600– 

1A11 (600), CL–600–2A12 (601), and 

CL–600–2B16 (601–3A, 601–3R, and 

604 Variants) airplanes, equipped with 

any Cox & Co. 3043 or 3044 series 

(potable water-line) ribbon heater. 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–2022– 

0090. 

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 February 8, 2022 (87 FR 

7056). The NPRM was prompted by a 

report of smoke in the aft cabin during 

a maintenance activity, which an 

investigation determined was caused by 

a faulty drain line ribbon heater. The 

NPRM proposed to require a general 

visual inspection of all affected potable 

water-line ribbon heater installations 

and corrective actions and other 

specified actions. The FAA is issuing 

this AD to address faulty potable waterline ribbon heaters, which, if not 

corrected, could lead to an onboard fire. 

See the MCAI for additional background 

information. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this final rule. The FAA received no 

comments on the NPRM or on the 

determination of the cost to the public. 

Conclusion 

The FAA reviewed the relevant data 

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 Service 

Bulletin 601–0644, Revision 1, dated 

January 29, 2019; and Service Bulletin 

604–30–007, Revision 1, dated January 

29, 2019. This service information 

describes procedures for a general visual 

inspection of all affected potable waterline ribbon heater installations for any 

discrepancy and applicable corrective 

actions and other specified actions. 

Discrepancies include discoloration, 

blistering or cracking of insulation, 

signs of wear, or heat damage. 

Corrective actions include replacement 

of discrepant insulation and ribbon 

heaters. Other specified actions include 

identifying the potable water-line ribbon 

heater pigtail wire configuration, 

installing a fuse to the ribbon heater 

power lead, and testing the potable 

water-line heater system of each ribbon 

heater. 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 585 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 


jspears on DSK121TN23PROD with RULES1