Federal Register / Vol. 86, No. 35 / Wednesday, February 24, 2021 / Proposed Rules 11165 

person may install a DCMP having P/N 

MB74F–9/–7 on any airplane. 

(i) Credit for Previous Actions 

This paragraph provides credit for actions 

required by paragraph (g) of this AD, if those 

actions were performed before the effective 

date of this AD using Bombardier Service 

Bulletin 100–29–18, dated July 2, 2013; 

Bombardier Service Bulletin 100–29–18, 

Revision 01, dated January 21, 2014; or 

Bombardier Service Bulletin 100–29–18, 

Revision 02, dated July 18, 2014. 

(j) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York ACO 

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 certification office, 

send it to ATTN: Program Manager, 

Continuing Operational Safety, FAA, New 

York ACO Branch, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; telephone 

516–228–7300; fax 516–794–5531. 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, New York ACO Branch, 

FAA; or Transport Canada Civil Aviation 

(TCCA); or Bombardier, Inc.’s TCCA Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(k) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) TCCA AD 

CF–2020–31, dated September 23, 2020, for 

related information. This MCAI may be 

found in the AD docket on the internet at 

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

and locating Docket No. FAA–2021–0097. 

(2) For more information about this AD, 

contact Steven Dzierzynski, Aerospace 

Engineer, Avionics and Electrical Systems 

Services Section, FAA, New York ACO 

Branch, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; phone: 516–228–7367; 

fax: 516–794–5531; email: 9-avs-nyaco-cos@

faa.gov. 

(3) For service information identified in 

this AD, contact Bombardier, Inc., 200 CoˆteVertu Road West, Dorval, Que ́bec 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 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. 

Issued on February 11, 2021. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–03587 Filed 2–23–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0098; Project 

Identifier MCAI–2020–01121–T] 

RIN 2120–AA64 

Airworthiness Directives; MHI RJ 

Aviation ULC (Type Certificate 

Previously Held by Bombardier, Inc.) 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2019–22–07, which applies to all MHI 

RJ Aviation ULC Model CL–600–2B19 

(Regional Jet Series 100 & 440) 

airplanes, Model CL–600–2C10 

(Regional Jet Series 700, 701 & 702) 

airplanes, Model CL–600–2D15 

(Regional Jet Series 705) airplanes, 

Model CL–600–2D24 (Regional Jet 

Series 900) airplanes, and Model CL– 

600–2E25 (Regional Jet Series 1000) 

airplanes. AD 2019–22–07 requires 

revising the existing airplane flight 

manual (AFM) to include a limitation 

and an abnormal operating procedure 

for the Automatic Flight Control System 

(AFCS). Since the FAA issued AD 2019– 

22–07, it was found that the limitation 

and abnormal operating procedure did 

not include reference to a certain mode. 

This proposed AD would require 

revising the existing AFM and adding 

airplanes to the applicability. The FAA 

is proposing this AD to address the 

unsafe condition on these products. 

DATES: The FAA must receive comments 

on this proposed AD by April 12, 2021. 

ADDRESSES: You may send comments, 

using the procedures found in 14 CFR 

11.43 and 11.45, by any of the following 

methods: 

• Federal eRulemaking Portal: Go to 

https://www.regulations.gov. Follow the 

instructions for submitting comments. 

• Fax: 202–493–2251. 

• Mail: U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

• Hand Delivery: Deliver to Mail 

address above between 9 a.m. and 5 

p.m., Monday through Friday, except 

Federal holidays. 

For MHI RJ Aviation ULC service 

information identified in this NPRM, 

contact MHI RJ Aviation ULC, 12655 

Henri-Fabre Blvd., Mirabel, Que ́bec J7N 

1E1 Canada; Widebody Customer 

Response Center North America toll-free 

telephone +1–844–272–2720 or directdial telephone +1–514–855–8500; fax 

+1–514–855–8501; email thd.crj@

mhirj.com; internet https://mhirj.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. 

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–2021– 

0098; 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 NPRM, any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Steven Dzierzynski, Aerospace 

Engineer, Avionics and Electrical 

Systems Section, FAA, New York ACO 

Branch, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 

516–228–7367; email 9-avs-nyaco-cos@

faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written relevant data, views, or 

arguments about this proposal. Send 

your comments to an address listed 

under ADDRESSES. Include ‘‘Docket No. 

FAA–2021–0098; Project Identifier 

MCAI–2020–01121–T’’ at the beginning 

of your comments. The most helpful 

comments reference a specific portion of 

the proposal, explain the reason for any 

recommended change, and include 

supporting data. The FAA will consider 

all comments received by the closing 

date and may amend the proposal 

because of those comments. 

Except for Confidential Business 

Information (CBI) as described in the 

following paragraph, and other 

information as described in 14 CFR 

11.35, the FAA will post all comments 

received, without change, to https://

www.regulations.gov, including any 

personal information you provide. The 


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agency will also post a report 

summarizing each substantive verbal 

contact received about this proposed 

AD. 

Confidential Business Information 

CBI is commercial or financial 

information that is both customarily and 

actually treated as private by its owner. 

Under the Freedom of Information Act 

(FOIA) (5 U.S.C. 552), CBI is exempt 

from public disclosure. If your 

comments responsive to this NPRM 

contain commercial or financial 

information that is customarily treated 

as private, that you actually treat as 

private, and that is relevant or 

responsive to this NPRM, it is important 

that you clearly designate the submitted 

comments as CBI. Please mark each 

page of your submission containing CBI 

as ‘‘PROPIN.’’ The FAA will treat such 

marked submissions as confidential 

under the FOIA, and they will not be 

placed in the public docket of this 

NPRM. Submissions containing CBI 

should be sent to Steven Dzierzynski, 

Aerospace Engineer, Avionics and 

Electrical Systems Section, FAA, New 

York ACO Branch, 1600 Stewart 

Avenue, Suite 410, Westbury, NY 

11590; telephone 516–228–7367; email 

9-avs-nyaco-cos@faa.gov. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Discussion 

The FAA issued AD 2019–22–07, 

Amendment 39–19786 (85 FR 439, 

January 6, 2020) (AD 2019–22–07), for 

all MHI RJ Aviation ULC Model CL– 

600–2B19 (Regional Jet Series 100 & 

440) airplanes, Model CL–600–2C10 

(Regional Jet Series 700, 701 & 702) 

airplanes, Model CL–600–2D15 

(Regional Jet Series 705) airplanes, 

Model CL–600–2D24 (Regional Jet 

Series 900) airplanes, and Model CL– 

600–2E25 (Regional Jet Series 1000) 

airplanes. AD 2019–22–07 requires 

revising the existing AFM to include a 

limitation and an abnormal operating 

procedure for the AFCS. AD 2019–22– 

07 resulted from a report that during 

AFCS ALTS CAP or (V) ALTS CAP 

mode, the flight guidance/autopilot does 

not account for engine failure while 

capturing an altitude. The FAA issued 

AD 2019–22–07 to address an engine 

failure, if it occurs during or before a 

climb while in ALTS CAP or (V) ALTS 

CAP mode, which may cause the 

airspeed to drop significantly below the 

safe operating speed, possibly resulting 

in reduced control of the airplane. 

Actions Since AD 2019–22–07 Was 

Issued 

Since the FAA issued AD 2019–22– 

07, it was found that the limitation and 

abnormal operating procedure did not 

include reference to (V) ALTV CAP 

mode. It was also found that the MHI RJ 

Aviation ULC Model CL–600–2C11 

(Regional Jet Series 550) airplanes are 

also affected by the same unsafe 

condition. 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued TCCA AD CF– 

2018–32R1, dated August 7, 2020 (also 

referred to after this as the Mandatory 

Continuing Airworthiness Information, 

or the MCAI), to correct an unsafe 

condition for all MHI RJ Aviation ULC 

Model CL–600–2B19 (Regional Jet 

Series 100 & 440), CL–600–2C10 

(Regional Jet Series 700, 701 & 702), CL– 

600–2C11 (Regional Jet Series 550), CL– 

600–2D15 (Regional Jet Series 705), CL– 

600–2D24 (Regional Jet Series 900), and 

CL–600–2E25 (Regional Jet Series 1000) 

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–2021–0098. 

This proposed AD was prompted by 

a report that found that the limitation 

and abnormal operating procedure did 

not include reference to (V) ALTV CAP 

mode (Model CL–600–2B19 airplanes 

do not have (V) ALTS CAP or (V) ALTV 

CAP mode). The risk of the unsafe 

condition also exists during (V) ALTV 

CAP mode. The FAA is proposing this 

AD to address an engine failure, if it 

occurs during or before a climb while in 

ALTS CAP, (V) ALTS CAP, or (V) ALTV 

CAP mode, as applicable, which may 

cause the airspeed to drop significantly 

below the safe operating speed, possibly 

resulting in reduced control of the 

airplane. See the MCAI for additional 

background information. 

Related Service Information Under 1 

CFR Part 51 

Bombardier has issued the following 

service information, which describes 

procedures for revising the existing 

AFM by including a limitation that 

specifies a warning for the AFCS and an 

abnormal operating procedure if an 

engine failure occurs during or before a 

climb while in ALTS CAP mode, (V) 

ALTS CAP mode, or (V) ALTV CAP 

mode, as applicable. These documents 

are distinct since they apply to different 

airplane models. 

• Subject 2, ‘‘Automatic Flight 

Control System (AFCS),’’ of Section 02– 

08, ‘‘System Limitations,’’ of Chapter 2, 

‘‘LIMITATIONS’’; and Subject 1.C, 

‘‘Engine Failure in Climb During ALTS 

CAP,’’ of Section 05–02, ‘‘IN–FLIGHT 

ENGINE FAILURES,’’ of Chapter 5, 

‘‘ABNORMAL PROCEDURES’’; of the 

Bombardier CRJ Series Regional Jet 

Model CL–600–2B19 AFM, CSP A–012, 

Volume 1, Revision 73, dated January 3, 

2020. 

• Subject 2,’’ Automatic Flight 

Control System (AFCS),’’ of Section 02– 

08, ‘‘System Limitations,’’ of Chapter 2, 

‘‘LIMITATIONS’’; and Subject 1.C, 

‘‘Engine Failure in Climb During ALTS 

CAP,’’ and Subject 1.D, ‘‘Engine Failure 

in Climb During (V) ALTS CAP or (V) 

ALTV CAP,’’ of Section 05–02, ‘‘IN– 

FLIGHT ENGINE FAILURES,’’ of 

Chapter 5, ‘‘ABNORMAL 

PROCEDURES’’; of the Bombardier CRJ 

Series Regional Jet Model CL–600–2C10 

(Series 700, 701, 702) and CL–600–2C11 

(Series 550) AFM CSP B–012, Revision 

31, dated May 8, 2020. 

• Subject 2, ‘‘Automatic Flight 

Control System (AFCS),’’ of Section 02– 

08, ‘‘System Limitations,’’ of Chapter 2, 

‘‘LIMITATIONS’’; and Subject 1.C, 

‘‘Engine Failure in Climb During ALTS 

CAP,’’ and Subject 1.D, ‘‘Engine Failure 

in Climb During (V) ALTS CAP or (V) 

ALTV CAP,’’ of Section 05–02, ‘‘IN– 

FLIGHT ENGINE FAILURES,’’ of 

Chapter 5, ‘‘ABNORMAL 

PROCEDURES’’; of the Bombardier CRJ 

Series Regional Jet Model CL–600–2D24 

(Series 900) and CL–600–2D15 (Series 

705) AFM, CSP C–012, Volume 1, 

Revision 24, dated March 27, 2020. 

• Subject 2, ‘‘Automatic Flight 

Control System (AFCS),’’ of Section 02– 

08, ‘‘System Limitations,’’ of Chapter 2, 

‘‘LIMITATIONS’’; and Subject 1.C, 

‘‘Engine Failure in Climb During ALTS 

CAP,’’ and Subject 1.D, ‘‘Engine Failure 

in Climb During (V) ALTS CAP or (V) 

ALTV CAP,’’ of Section 05–02, ‘‘IN– 

FLIGHT ENGINE FAILURES,’’ of 

Chapter 5, ‘‘ABNORMAL 

PROCEDURES’’; of the Bombardier CRJ 

Series Regional Jet Model CL–600–2E25 

(Series 1000) AFM CSP D–012, Revision 

23, dated February 14, 2020. 

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. 

FAA’s Determination 

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 the State 

of Design Authority, the FAA has been 

notified of the unsafe condition 

described in the MCAI and service 

information referenced above. The FAA 

is proposing this AD because the FAA 


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evaluated all the relevant information 

and determined the unsafe condition 

described previously is likely to exist or 

develop on other products of the same 

type design. 

Proposed Requirements of This NPRM 

This proposed AD would retain none 

of the requirements of AD 2019–22–07. 

This proposed AD would require 

revising the existing AFM to include 

reference to (V) ALTV CAP mode, as 

applicable, in the limitation and an 

abnormal operating procedure for the 

AFCS. 

Costs of Compliance 

The FAA estimates that this proposed 

AD affects 992 airplanes of U.S. registry. 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

New proposed actions ............ 1 work-hour × $85 per hour = $85 ......................................... $0 $85 $84,320 

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 has 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) 2019–22–07, Amendment 39– 

19786 (85 FR 439, January 6, 2020), and 

■ b. Adding the following new AD: 

MHI RJ Aviation ULC (Type Certificate 

Previously Held by Bombardier, Inc.): 

Docket No. FAA–2021–0098; Project 

Identifier MCAI–2020–01121–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) action by April 

12, 2021. 

(b) Affected ADs 

This AD replaces AD 2019–22–07, 

Amendment 39–19786 (85 FR 439, January 6, 

2020) (AD 2019–22–07). 

(c) Applicability 

This AD applies to the MHI RJ Aviation 

ULC airplanes identified in paragraphs (c)(1) 

through (6) of this AD, certificated in any 

category, all manufacturer serial numbers. 

(1) Model CL–600–2B19 (Regional Jet 

Series 100 & 440) airplanes. 

(2) Model CL–600–2C10 (Regional Jet 

Series 700, 701 & 702) airplanes. 

(3) Model CL–600–2C11 (Regional Jet 

Series 550) airplanes. 

(4) Model CL–600–2D15 (Regional Jet 

Series 705) airplanes. 

(5) Model CL–600–2D24 (Regional Jet 

Series 900) airplanes. 

(6) Model CL–600–2E25 (Regional Jet 

Series 1000) airplanes. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 22, Auto Flight. 

(e) Reason 

This AD was prompted by a report that 

during the Automatic Flight Control System 

(AFCS) ALTS CAP, (V) ALTS CAP, or (V) 

ALTV CAP mode, the flight guidance/ 

autopilot does not account for engine failure 

while capturing an altitude. The FAA is 

issuing this AD to address an engine failure, 

if it occurs during or before a climb while in 

ALTS CAP, (V) ALTS CAP, or (V) ALTV CAP 

mode, which may cause the airspeed to drop 

significantly below the safe operating speed, 

possibly resulting in reduced control of the 

airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Revision of the Airplane Flight Manual 

(AFM) 

Within 60 days after the effective date of 

this AD: Revise the existing AFM to include 

the information in Subject 2, ‘‘Automatic 

Flight Control System (AFCS),’’ of Section 

02–08, ‘‘System Limitations,’’ of Chapter 2, 

‘‘LIMITATIONS’’; and Subject 1.C, ‘‘Engine 

Failure in Climb During ALTS CAP,’’ or 

Subject 1.D, ‘‘Engine Failure in Climb During 

(V) ALTS CAP or (V) ALTV CAP,’’ of Section 

05–02, ‘‘IN–FLIGHT ENGINE FAILURES,’’ of 

Chapter 5, ‘‘ABNORMAL PROCEDURES’’; as 

applicable; of the applicable AFM identified 

in figure 1 to paragraph (g) of this AD. 

BILLING CODE 4910–13–P 


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(h) Credit for Previous Actions 

This paragraph provides credit for actions 

required by paragraph (g) of this AD, if those 

actions were performed before the effective 

date of this AD, using the applicable AFM 

specified in figure 2 to paragraph (h) of this 

AD. 


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(i) Other FAA AD Provisions 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York ACO 

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 certification office, 

send it to ATTN: Program Manager, 

Continuing Operational Safety, FAA, New 

York ACO Branch, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; telephone 

516–228–7300; fax 516–794–5531. 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, New York ACO Branch, 

FAA; or Transport Canada Civil Aviation 

(TCCA); or MHI RJ Aviation ULC’s TCCA 

Design Approval Organization (DAO). If 

approved by the DAO, the approval must 

include the DAO-authorized signature. 

(j) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) TCCA AD 

CF–2018–32R1, dated August 7, 2020, for 

related information. This MCAI may be 

found in the AD docket on the internet at 

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

and locating Docket No. FAA–2021–0098. 

(2) For more information about this AD, 

contact Steven Dzierzynski, Aerospace 

Engineer, Avionics and Electrical Systems 

Section, FAA, New York ACO Branch, 1600 

Stewart Avenue, Suite 410, Westbury, NY 

11590; telephone 516–228–7367; email 9-avsnyaco-cos@faa.gov. 

(3) For MHI RJ Aviation ULC service 

information identified in this AD, contact 

MHI RJ Aviation ULC, 12655 Henri-Fabre 

Blvd., Mirabel, Que ́bec J7N 1E1 Canada; 

Widebody Customer Response Center North 

America toll-free telephone +1–844–272– 

2720 or direct-dial telephone +1–514–855– 

8500; fax +1–514–855–8501; email thd.crj@

mhirj.com; internet https://mhirj.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. 

Issued on February 12, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–03589 Filed 2–23–21; 8:45 am] 

BILLING CODE 4910–13–C 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0973; Project 

Identifier MCAI–2020–01113–T] 

RIN 2120–AA64 

Airworthiness Directives; ATR–GIE 

Avions de Transport Re ́gional 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Supplemental notice of 

proposed rulemaking (SNPRM); 

reopening of comment period. 

SUMMARY: The FAA is revising an earlier 

proposal to supersede Airworthiness 

Directives (AD) 2000–23–04 R1 and AD 

2018–20–14, which apply to certain 

ATR–GIE Avions de Transport Re ́gional 

Model ATR42–500 airplanes. This 

action revises the notice of proposed 

rulemaking (NPRM) by including new 

or more restrictive airworthiness 

limitations. The FAA is proposing this 

AD to address the unsafe condition on 

these products. Since this action would 


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