Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules 38943 

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 2021–05–16, Amendment 39–21459 

(86 FR 17287, April 2, 2021); and 

■ b. Adding the following new 

airworthiness directive: 

Pratt & Whitney Division: Docket No. FAA– 

2021–0577; Project Identifier AD–2021– 

00470–E. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) action by 

September 7, 2021. 

(b) Affected ADs 

This AD replaces AD 2021–05–16, 

Amendment 39–21459 (86 FR 17287, April 2, 

2021). 

(c) Applicability 

This AD applies to Pratt & Whitney 

Division (PW) PW4164, PW4164–1D, 

PW4168, PW4168–1D, PW4168A, PW4168A– 

1D, and PW4170 model turbofan engines 

with low-pressure turbine (LPT) 4th-stage air 

sealing ring segment assemblies, part number 

(P/N) 50N463–01, P/N 50N526–01, or FAAapproved equivalent part numbers, installed. 

(d) Subject 

Joint Aircraft System Component (JASC) 

Code 7250, Turbine Section. 

(e) Unsafe Condition 

This AD was prompted by several reports 

from the manufacturer concerning LPT 4thstage vane cluster assemblies leaning back 

and notching into the rotating LPT 4th-stage 

blades, causing some blades to fracture and 

release. A manufacturer investigation into 

those reports determined that the leaning 

back of the LPT 4th-stage vane cluster 

assemblies was caused by damage to the LPT 

4th-stage air sealing ring segment assemblies. 

The FAA is issuing this AD to prevent 

damage to the LPT 4th-stage air sealing ring 

segment assemblies, the LPT case, and the 

LPT 4th-stage blades. The unsafe condition, 

if not addressed, could result in uncontained 

release of the LPT 4th-stage blades, damage 

to the engine, and damage to the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) For affected engines that have either the 

Talon IIA outer combustion chamber 

assembly, P/N 51J100 or P/N 51J382, or the 

Talon IIB outer combustion chamber 

assembly, P/N 51J381 or P/N 51J500, 

installed, at the next engine shop visit after 

the effective date of this AD, remove from 

service the LPT 4th-stage air sealing ring 

segment assemblies, P/N 50N463–01, P/N 

50N526–01, or FAA-approved equivalent 

part numbers, and replace with parts eligible 

for installation. 

(2) For affected engines not referenced in 

paragraph (g)(1) of this AD, at the next LPT 

overhaul after the effective date of this AD, 

remove from service the LPT 4th-stage air 

sealing ring segment assemblies, P/N 

50N463–01, P/N 50N526–01, or FAAapproved equivalent part numbers, and 

replace with parts eligible for installation. 

(3) For all affected engines, at each LPT 

overhaul after compliance with the required 

actions in paragraphs (g)(1) or (2) of this AD, 

remove from service the LPT 4th-stage air 

sealing ring segment assemblies, P/N 

50N526–01 or FAA-approved equivalent part 

numbers, and replace with parts eligible for 

installation. 

(4) During each replacement of the LPT 

4th-stage air sealing ring segment assemblies 

required by paragraphs (g)(1) through (3) of 

this AD, perform a dimensional inspection of 

the LPT case for bulging in accordance with 

the Accomplishment Instructions, paragraph 

2, of PW Alert Service Bulletin No. PW4G– 

100–A72–262 Revision No. 1, dated 

September 3, 2020 (the ASB). 

(5) If, during the dimensional inspection of 

the LPT case required by paragraph (g)(4) of 

this AD, any LPT case found to be outside 

the serviceable limits specified in Table 1: 

Serviceable Limits and Repairs of the ASB, 

repair or replace the LPT case before further 

flight. 

(h) Definitions 

For the purpose of this AD: 

(1) An ‘‘engine shop visit’’ is the induction 

of an engine into the shop for maintenance 

involving the separation of pairs of major 

mating engine flanges H through P. The 

separation of engine flanges solely for the 

purpose of transportation without subsequent 

engine maintenance does not constitute an 

engine shop visit. 

(2) An ‘‘LPT overhaul’’ is when the LPT 

rotor is removed from the engine, all four 

disks are removed from the LPT rotor, and all 

blades are removed from the disks. 

(3) ‘‘Parts eligible for installation’’ are LPT 

4th-stage air sealing ring segment assemblies, 

P/N 50N526–01, or FAA-approved equivalent 

part numbers, with zero flight cycles since 

new or with a P/N not mentioned in this AD. 

(i) Credit for Previous Actions 

You may take credit for the dimensional 

inspection of the LPT case for bulging 

required by paragraph (g)(4) of this AD if the 

inspection was performed before the effective 

date of this AD using PW ASB No. PW4G– 

100–A72–262 Original Issue, dated October 

22, 2019. 

(j) 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 certification office, 

send it to the attention of the person 

identified in Related Information. 

Information may be emailed to: ANE-ADAMOC@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. 

(k) Related Information 

(1) For more information about this AD, 

contact Carol Nguyen, Aviation Safety 

Engineer, ECO Branch, FAA, 1200 District 

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

238–7655; fax: (781) 238–7199; email: 

carol.nguyen@faa.gov. 

(2) For service information identified in 

this AD, contact Pratt & Whitney, 400 Main 

Street, East Hartford, CT 06118; phone: (800) 

565–0140; email: help24@prattwhitney.com; 

website: https://prattwhitney.com. You may 

view this referenced service information 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. 

Issued on July 16, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–15518 Filed 7–22–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0574; Project 

Identifier 2019–SW–073–AD] 

RIN 2120–AA64 

Airworthiness Directives; He ́licopte`res 

Guimbal Helicopters 

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 He ́licopte`res Guimbal Model 

CABRI G2 helicopters. This proposed 

AD was prompted by a report that, 


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38944 Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules 

during scheduled maintenance on two 

helicopters, cracks were found on a 

certain main rotor (MR) non-rotating 

scissor link. This proposed AD would 

require replacing an affected MR nonrotating scissor link with a serviceable 

part. 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 August 23, 

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 service information identified in 

this NPRM, contact He ́licopte`res 

Guimbal, 1070, rue du Lieutenant 

Parayre, Ae ́rodrome d’Aix-en-Provence, 

13290 Les Milles, France; telephone 

33–04–42–39–10–88; email support@

guimbal.com; or at https://

www.guimbal.com. 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. Service information that is 

incorporated by reference is also 

available at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0574. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0574; 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, the European Union Aviation 

Safety Agency (EASA) AD, any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Darren Gassetto, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance 

& Airworthiness Division, FAA, 1600 

Stewart Ave., Suite 410, Westbury, NY 

11590; telephone (516) 228–7323; email 

Darren.Gassetto@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Comments Invited 

The FAA invites you to send any 

written data, views, or arguments about 

this proposal. Send your comments to 

an address listed under ADDRESSES. 

Include ‘‘Docket No. FAA–2021–0574; 

Project Identifier 2019–SW–073–AD’’ 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 AD. 

Submissions containing CBI should be 

sent to Darren Gassetto, Aerospace 

Engineer, COS Program Management 

Section, Operational Safety Branch, 

Compliance & Airworthiness Division, 

FAA, 1600 Stewart Ave., Suite 410, 

Westbury, NY 11590; telephone (516) 

228–7323; email Darren.Gassetto@

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 2019–0186, 

dated July 30, 2019 (EASA AD 2019– 

0186), to correct an unsafe condition for 

He ́licopte`res Guimbal Model CABRI G2 

helicopters, all manufacturer serial 

numbers. EASA advises that, during 

scheduled maintenance on two 

helicopters, cracks were found on the 

MR non-rotating scissor link, part 

number (P/N) G41–10–200. The 

suspected root cause for the cracking is 

corrosion due to stress induced by the 

mounting of the metal bushings inside 

the lug hole. To address this issue the 

manufacturer modified the design of the 

MR non-rotating scissor link to reinforce 

the lugs and replace the metal bushings 

with plastic bushings. Cracking of a MR 

non-rotating scissor link, if not 

addressed, could result in failure of that 

scissor link, resulting in reduced control 

of the helicopter. 

Accordingly, EASA AD 2019–0186 

requires replacement of affected MR 

non-rotating scissor links with 

serviceable parts. 

FAA’s Determination 

These helicopters have been approved 

by EASA and are approved for operation 

in the United States. Pursuant to the 

FAA’s bilateral agreement with the 

European Union, EASA has notified the 

FAA about the unsafe condition 

described in its AD. The FAA is issuing 

this AD after evaluating all known 

relevant information and determining 

that the unsafe condition described 

previously is likely to exist or develop 

on other helicopters of the same type 

design. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Guimbal Service 

Bulletin SB 15–015, Revision C, dated 

August 27, 2019. This service 

information specifies procedures for, 

among other actions, modifying the 

helicopter by replacing the MR nonrotating scissor link, P/N G41–10–200, 

with a serviceable part, P/N G41–10– 

201 (by installing scissor link assembly, 

P/N G41–12–100, which includes MR 

non-rotating scissor link, P/N G41–10– 

201) and torqueing the bolts. 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. 

Other Related Service Information 

The FAA also reviewed Guimbal 

Service Bulletin SB 15–015, Revision A, 

dated July 20, 2015 (SB 15–015, 

Revision A); and SB 15–015, Revision B, 

dated July 12, 2019 (SB 15–015, 

Revision B). SB 15–015, Revision A, 

describes procedures for replacing a MR 


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Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules 38945 

non-rotating scissor link, P/N G41–10– 

200, with P/N G41–12–100, which has 

a new, improved design. Service 

Bulletin SB 15–015, Revision B, 

describes the same procedures as SB 

15–015, Revision A, and includes a 

revised compliance time, an updated 

Situation section, and added an action. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the service information already 

described. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 32 

helicopters 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 

Replacement ................................................... 1 work-hour × $85 per hour = $85 ................. $323 $408 $13,056 

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 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, I certify 

that this proposed regulation: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

and 

(2) Would not affect intrastate 

aviation in Alaska. 

(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: 

He ́licopte`res Guimbal: Docket No. FAA– 

2021–0574; Project Identifier 2019–SW– 

073–AD. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by August 23, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to He ́licopte`res Guimbal 

Model CABRI G2 helicopters, certificated in 

any category, with main rotor (MR) nonrotating scissor links, part number (P/N) 

G41–10–200 installed. 

(d) Subject 

Joint Aircraft Service Component (JASC) 

Code: 6700, Rotorcraft Flight Control. 

(e) Unsafe Condition 

This AD was prompted by a report that 

during scheduled maintenance on two 

helicopters, cracks were found on the MR 

non-rotating scissor link with part number 

(P/N) G41–10–200. The FAA is issuing this 

AD to address cracking of a MR non-rotating 

scissor link. Cracking of a MR non-rotating 

scissor link, if not addressed, could result in 

failure of that scissor link, resulting in 

reduced control of the helicopter. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 50 hours time-in-service or 2 

months after the effective date of this AD, 

whichever occurs first, modify the helicopter 

by replacing the MR non-rotating scissor link, 

P/N G41–10–200, with a serviceable scissor 

link assembly, P/N G41–12–100, in 

accordance with the Required Actions, IPC 

4.1–2 (a) through (d) inclusive, of Guimbal 

Service Bulletin SB 15–015, Revision C, 

dated August 27, 2019. 

(2) As of the effective date of this AD, do 

not install a MR non-rotating scissor link, P/ 

N G41–10–200, on any helicopter. 

(h) Credit for Previous Actions 

This paragraph provides credit for actions 

required by paragraph (g)(1) of this AD, if 

those actions were performed before the 

effective date of this AD using the service 

information specified in paragraph (h)(1) or 

(2) of this AD. 

(1) Guimbal Service Bulletin SB 15–015, 

Revision A, dated July 20, 2015. 

(2) Guimbal Service Bulletin SB 15–015, 

Revision B, dated July 12, 2019. 

(i) Special Flight Permits 

Special flight permits, as described in 14 

CFR 21.197 and 21.199, are prohibited. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) 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 local 

Flight Standards District Office, as 

appropriate. If sending information directly 

to the manager of the International Validation 

Branch, send it to the attention of the person 

identified in paragraph (k)(1) of this AD. 

Information may be emailed to: 9-AVS-AIR730-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. 


khammond on DSKJM1Z7X2PROD with PROPOSALS
38946 Federal Register / Vol. 86, No. 139 / Friday, July 23, 2021 / Proposed Rules 

(k) Related Information 

(1) For more information about this AD, 

contact Darren Gassetto, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance & 

Airworthiness Division, FAA, 1600 Stewart 

Ave., Suite 410, Westbury, NY 11590; 

telephone (516) 228–7323; email 

Darren.Gassetto@faa.gov. 

(2) For service information identified in 

this AD, contact He ́licopte`res Guimbal, 1070, 

rue du Lieutenant Parayre, Ae ́rodrome d’Aixen-Provence, 13290 Les Milles, France; 

telephone 33–04–42–39–10–88; email 

support@guimbal.com; or at https://

www.guimbal.com. You may view this 

referenced 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. 

(3) The subject of this AD is addressed in 

European Union Aviation Safety Agency 

(EASA) AD 2019–0186, dated July 30, 2019. 

You may view the EASA AD at https://

www.regulations.gov in Docket No. FAA– 

2021–0574. 

Issued on July 14, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–15475 Filed 7–22–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0575; Project 

Identifier MCAI–2020–00545–R] 

RIN 2120–AA64 

Airworthiness Directives; Bell Textron 

Canada Limited (Type Certificate 

Previously Held by Bell Helicopter 

Textron Canada Limited) Helicopters 

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 Bell Textron Canada Limited 

(type certificate previously held by Bell 

Helicopter Textron Canada Limited) 

(Bell) Model 429 helicopters. This 

proposed AD was prompted by reports 

of incorrectly staked spherical bearings 

in the directional control bellcrank 

assembly. This proposed AD would 

require a one-time inspection of the 

lower surface of the spherical bearing in 

the directional control bellcrank 

assembly to determine if it is properly 

staked and, depending on the findings, 

applicable corrective actions. For 

certain helicopters, this proposed AD 

would also require repetitive 

inspections and, depending on the 

findings, applicable corrective actions. 

This proposed AD would also provide a 

terminating action for the repetitive 

inspections. The FAA is proposing this 

AD to address the unsafe condition on 

these products. 

DATES: The FAA must receive comments 

on this proposed AD September 7, 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 between 9 a.m. and 5 p.m., 

Monday through Friday, except Federal 

holidays. 

For service information identified in 

this NPRM, contact Bell Textron Canada 

Limited, 12,800 Rue de l’Avenir, 

Mirabel, Quebec J7J 1R4, Canada; 

telephone 1–450–437–2862 or 1–800– 

363–8023; fax 1–450–433–0272; email 

productsupport@bellflight.com; or at 

https://www.bellflight.com/support/ 

contact-support. 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. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0575; 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, the Transport Canada AD, any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Andrea Jimenez, Aerospace Engineer, 

COS Program Management Section, 

Operational Safety Branch, Compliance 

& Airworthiness Division, FAA, 1600 

Stewart Ave., Suite 410, Westbury, NY 

11590; telephone (516) 228–7330; email 

andrea.jimenez@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–2021–0575; Project Identifier 

MCAI–2020–00545–R’’ 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 Andrea Jimenez, 

Aerospace Engineer, COS Program 

Management Section, Operational 

Safety Branch, Compliance & 

Airworthiness Division, FAA, 1600 

Stewart Ave., Suite 410, Westbury, NY 

11590; telephone (516) 228–7330; email 

andrea.jimenez@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 

Transport Canada, which is the 

aviation authority for Canada, has 

issued Canadian AD CF–2020–11, dated 

April 16, 2020 (Transport Canada AD 

CF–2020–11), to correct an unsafe 


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