44316 Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by September 

27, 2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–100–1A10, certificated in any 

category, serial numbers 20003 through 

20780 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 32, Landing gear. 

(e) Unsafe Condition 

This AD was prompted by a discovery that 

a lockwire may not have been installed on 

the side stay actuator pin nut of the main 

landing gear (MLG). The FAA is issuing this 

AD to address a possible missing lockwire, 

which could result in loss of the nut, and if 

undetected, lead to the collapse of the 

affected MLG. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

Within 12 months after the effective date 

of this AD: Inspect the left-hand (LH) and 

right-hand (RH) MLG side stay actuator 

assembly pin nuts for presence of a lockwire, 

in accordance with paragraph 2.B of the 

Accomplishment Instructions of the 

applicable service information specified in 

paragraphs (g)(1) and (2) of this AD. If the 

lockwire is missing: Before further flight, 

install a lockwire in accordance with 

paragraph 2.C of the Accomplishment 

Instructions of the applicable service 

information specified in paragraphs (g)(1) 

and (2) of this AD. 

(1) Bombardier Service Bulletin 100–32– 

36, dated June 25, 2020. 

(2) Bombardier Service Bulletin 350–32– 

012, dated June 25, 2020. 

(h) 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. 

(i) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI), TCCA 

AD CF–2020–52, dated November 30, 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–2021–0658. 

(2) For more information about this AD, 

contact Elizabeth Dowling, Aerospace 

Engineer, Mechanical Systems and 

Administrative Services Section, FAA, New 

York ACO Branch, 1600 Stewart Avenue, 

Suite 410, Westbury, NY 11590; telephone 

516–228–7300; 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 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. 

Issued on August 4, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16938 Filed 8–11–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0655; Project 

Identifier MCAI–2020–01497–E] 

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: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for all 

Rolls-Royce Deutschland Ltd. & Co KG 

(RRD) Trent 7000–72 and Trent 7000– 

72C model turbofan engines. This 

proposed AD was prompted by the 

manufacturer revising the engine Time 

Limits Manual (TLM) life limits of 

certain critical rotating parts and 

updating certain maintenance tasks. The 

proposed AD would require the operator 

to revise the airworthiness limitation 

section (ALS) of their approved 

maintenance program (AMP) by 

incorporating the revised tasks of the 

applicable TLM for each affected model 

turbofan engine, as specified in a 

European Union Aviation Safety Agency 

(EASA) AD, which is proposed for 

incorporation by reference (IBR). 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 September 27, 

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 material that is proposed for IBR 

in this AD, contact EASA, KonradAdenauer-Ufer 3, 50668 Cologne, 

Germany; phone: +49 221 8999 000; 

email: ADs@easa.europa.eu; website: 

https://www.easa.europa.eu. You may 

find this material on the EASA website 

at https://ad.easa.europa.eu. For RRD 

service information identified in this 

NPRM, 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 (781) 238– 

7759. The EASA material is also 

available at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0655. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0655; or in person at Docket 

Operations between 9 a.m. and 5 p.m., 


lotter on DSK11XQN23PROD with PROPOSALS1
Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules 44317 

Monday through Friday, except Federal 

holidays. The AD docket contains this 

NPRM, the EASA AD, any comments 

received, and other information. The 

street address for Docket Operations is 

listed above. 

FOR FURTHER INFORMATION CONTACT: 

Kevin M. Clark, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 

District Avenue, Burlington, MA 01803; 

phone: (781) 238–7088; fax: (781) 238– 

7199; email: kevin.m.clark@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–2021–0655; Project Identifier 

MCAI–2020–01497–E’’ 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 this 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 

agency will also post a report 

summarizing each substantive verbal 

contact received about this NPRM. 

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 Kevin M. Clark, 

Aviation Safety Engineer, ECO Branch, 

FAA, 1200 District Avenue, Burlington, 

MA 01803. Any commentary that the 

FAA receives that is not specifically 

designated as CBI will be placed in the 

public docket for this rulemaking. 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2020–0244, 

dated November 5, 2020 (EASA AD 

2020–0244), to correct an unsafe 

condition on RRD Trent 7000–72 and 

Trent 7000–72C model turbofan 

engines. 

This proposed AD was prompted by 

the manufacturer revising the engine 

TLM life limits of certain critical 

rotating parts and updating certain 

maintenance tasks. The FAA is 

proposing this AD to prevent the failure 

of critical rotating parts. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed EASA AD 2020– 

0244. EASA AD 2020–0244 specifies 

revising the approved AMP by 

incorporating the limitations, tasks, and 

associated thresholds and intervals 

described in the TLM. 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 Chapter 05–10 of 

Rolls-Royce (RR) Trent 7000 TLM T– 

T7000–1RR, dated July 10, 2020. RR 

Trent 7000 TLM T–T7000–1RR, Chapter 

05–10, identifies the reduced life limits 

of certain critical rotating parts. 

The FAA also reviewed Chapter 05– 

20 of RR Trent 7000 TLM T–T7000– 

1RR, dated July 10, 2020. RR Trent 7000 

TLM T–T7000–1RR, Chapter 05–20, 

identifies the critical rotating part 

inspection thresholds and intervals. 

FAA’s Determination 

These engines have been approved by 

the aviation authority of another 

country and are 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 about the unsafe condition 

described in the EASA AD referenced in 

this proposed AD. The FAA is issuing 

this NPRM after determining that the 

unsafe condition described previously is 

likely to exist or develop on other 

products of the same type design. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2020–0244, described 

previously, as incorporated by 

reference, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD and 

except as discussed under ‘‘Differences 

Between this Proposed AD and the 

EASA AD.’’ 

Explanation of Required Compliance 

Information 

In the FAA’s ongoing efforts to 

improve the efficiency of the AD 

process, the FAA initially worked with 

Airbus and EASA to develop a process 

to use certain EASA ADs as the primary 

source of information for compliance 

with requirements for corresponding 

FAA ADs. The FAA has since 

coordinated with other manufacturers 

and civil aviation authorities (CAAs) to 

use this process. As a result, EASA AD 

2020–0244 will be incorporated by 

reference in the FAA final rule. This 

proposed AD would require compliance 

with EASA AD 2020–0244 in its 

entirety, through that incorporation, 

except for any differences identified as 

exceptions in the regulatory text of this 

proposed AD. Using common terms that 

are the same as the heading of a 

particular section in EASA AD 2020– 

0244 does not mean that operators need 

comply only with that section. For 

example, where the AD requirement 

refers to ‘‘all required actions and 

compliance times,’’ compliance with 

this AD requirement is not limited to 

the section titled ‘‘Required Action(s) 

and Compliance Time(s)’’ in EASA AD 

2020–0244. Service information 

specified in EASA AD 2020–0244 that is 

required for compliance with it will be 

available at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0655 after the FAA final 

rule is published. 

Differences Between This Proposed AD 

and the EASA AD 

This AD does not mandate the 

‘‘Maintenance Tasks and Replacement 

of Critical Parts’’ and ‘‘Corrective 

Action(s)’’ sections of EASA AD 2020– 

0244. Where EASA AD 2020–0244 

requires compliance from its effective 

date, this AD requires using the effective 

date of this AD. Where EASA AD 2020– 

0244 requires revising the AMP within 

12 months from its effective date, this 

AD requires revising the AMP within 90 

days after the effective date of this AD. 

This AD does not mandate compliance 

with the ‘‘Remarks’’ section of EASA 

AD 2020–0244. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 10 

engines installed on airplanes of U.S. 

Registry. 


lotter on DSK11XQN23PROD with PROPOSALS1
44318 Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules 

The FAA estimates the following 

costs to comply with this proposed AD: 

ESTIMATED COSTS

Action Labor cost Parts cost Cost per 

product 

Cost on U.S. 

operators 

Revise the ALS ............................................... 1 work-hour × $85 per hour = $85 ................. $0 $85 $850 

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 adding 

the following new airworthiness 

directive: 

Rolls-Royce Deutschland Ltd & Co KG (Type 

Certificate previously held by RollsRoyce plc): Docket No. FAA–2021–0655; 

Project Identifier MCAI–2020–01497–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by September 

27, 2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Rolls-Royce 

Deutschland Ltd. & Co KG (RRD) (Type 

Certificate previously held by Rolls-Royce 

plc) Trent 7000–72 and Trent 7000–72C 

model turbofan engines. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code 7200, Engine (Turbine/Turboprop). 

(e) Unsafe Condition 

This AD was prompted by the 

manufacturer revising the engine Time 

Limits Manual (TLM) life limits of certain 

critical rotating parts and updating certain 

maintenance tasks. The FAA is issuing this 

AD prevent the failure of critical rotating 

parts. The unsafe condition, if not addressed, 

could result in failure of one or more engines, 

loss of thrust control, and loss 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, European Union Aviation 

Safety Agency AD 2020–0244, dated 

November 5, 2020 (EASA AD 2020–0244). 

(h) Exceptions to EASA AD 2020–0244 

(1) The requirements specified in 

paragraphs (1) and (2) of EASA AD 2020– 

0244 are not required by this AD. 

(2) Where EASA AD 2020–0244 requires 

compliance from its effective date, this AD 

requires using the effective date of this AD. 

(3) Paragraph (3) of EASA AD 2020–0244 

specifies revising the approved AMP within 

12 months after its effective date, but this AD 

requires revising the approved AMP within 

90 days after the effective date of this AD. 

(4) This AD does not mandate compliance 

with the ‘‘Remarks’’ section of EASA AD 

2020–0244. 

(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)(2) 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. 

(j) Related Information 

(1) For more information about EASA AD 

2020–0244, 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. 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 (781) 238–7759. 

This material may be found in the AD docket 

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

for and locating Docket No. FAA–2021–0655. 

(2) For more information about this AD, 

contact Kevin M. Clark, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

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

238–7088; fax: (781) 238–7199; email: 

kevin.m.clark@faa.gov. 

(3) For RRD service information identified 

in this AD, 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 (781) 238–7759. 


lotter on DSK11XQN23PROD with PROPOSALS1
Federal Register / Vol. 86, No. 153 / Thursday, August 12, 2021 / Proposed Rules 44319 

Issued on August 3, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16902 Filed 8–11–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0657; Project 

Identifier MCAI–2021–00478–T] 

RIN 2120–AA64 

Airworthiness Directives; Airbus SAS 

Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to adopt a 

new airworthiness directive (AD) for 

certain Airbus SAS Model A350–941 

and –1041 airplanes. This proposed AD 

was prompted by a report indicating 

that during maintenance, a fuse pin 

retaining the main landing gear support 

structure (MLGSS) was found 

incorrectly engaged in the trunnion 

block and improperly secured with the 

associated retaining pin, due to 

incorrect installation during assembly. 

This proposed AD would require 

inspecting the fuse pins and associated 

retaining pins of the MLGSS for such 

discrepancies, and corrective action if 

necessary, as specified in a European 

Union Aviation Safety Agency (EASA) 

AD, which is proposed for incorporation 

by reference. 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 September 27, 

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 material that will be incorporated 

by reference (IBR) in this AD, 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 this IBR material on the EASA 

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

You may view this IBR material 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 in the AD docket on 

the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0657. 

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– 

0657; 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: Nick 

Wilson, Aerospace Engineer, Large 

Aircraft Section, International 

Validation Branch, FAA, 2200 South 

216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3230; email 

nicholas.wilson@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–2021–0657; Project Identifier 

MCAI–2021–00478–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 

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 Nick Wilson, 

Aerospace Engineer, Large Aircraft 

Section, International Validation 

Branch, FAA, 2200 South 216th St., Des 

Moines, WA 98198; telephone and fax 

206–231–3230; email nicholas.wilson@

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. 

Background 

EASA, which is the Technical Agent 

for the Member States of the European 

Union, has issued EASA AD 2021–0112, 

dated April 22, 2021 (EASA AD 2021– 

0112), to correct an unsafe condition for 

certain Airbus SAS Model A350–941 

and –1041 airplanes. 

This proposed AD was prompted by 

a report indicating that during 

maintenance, a fuse pin retaining the 

MLGSS was found incorrectly engaged 

in the trunnion block and improperly 

secured with the associated retaining 

pin; this was due to incorrect 

installation during assembly. The FAA 

is proposing this AD to address 

incorrect fuse pin installations, which 

could lead to premature failure of the 

retaining pin and subsequent fuse pin 

migration and disconnection, and could 

ultimately lead to main landing gear 

collapse and possible damage to the 

airplane. See the MCAI for additional 

background information. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2021–0112 describes 

procedures for a detailed inspection for 

discrepancies (missing or migrated fuse 

pins, and fuse pins improperly secured 

with the associated retaining pin) in the 

left- and right-hand sides of the MLGSS 

trunnion block. The service information 

also describes procedures for corrective 


lotter on DSK11XQN23PROD with PROPOSALS1