Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules 35413 

inertia reel, which could prevent the seatbelt 

from locking and result in injury to the 

occupant during an emergency landing. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

(1) Within 25 hours time-in-service, after 

the effective date of this AD: 

(i) Remove each comfort clip from service. 

(ii) Inspect each shoulder harness seat belt 

for a rip and abrasion. If there is a rip or any 

abrasion, before further flight, remove the 

shoulder harness seat belt from service. 

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

not install any comfort clip on any 

helicopter. 

(h) 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 (i)(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. 

(i) Related Information 

(1) For more information about this AD, 

contact Steven Warwick, Aerospace 

Engineer, Certification Section, Fort Worth 

ACO Branch, Compliance & Airworthiness 

Division, FAA, 10101 Hillwood Pkwy., Fort 

Worth, TX 76177; telephone (817) 222–5225; 

email Steven.R.Warwick@faa.gov. 

(2) For service information identified in 

this AD, contact Bell Textron Canada 

Limited, 12,800 Rue de l’Avenir, Mirabel, 

Quebec J7J1R4; 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/contactsupport. 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 

Transport Canada AD CF–2018–16, dated 

June 14, 2018. You may view the Transport 

Canada AD on the internet at https://

www.regulations.gov in the AD Docket in 

Docket No. FAA–2021–0539. 

Issued on June 28, 2021. 

Ross Landes, 

Deputy Director for Regulatory Operations, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2021–14257 Filed 7–2–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0545; Project 

Identifier MCAI–2021–00071–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 all 

Airbus SAS Model A350–941 and –1041 

airplanes. This proposed AD was 

prompted by a report of a broken 

forward guide arm found during a 

passenger door emergency opening test. 

Investigation results indicated that the 

opening speed of the door was higher 

than expected, likely caused by a 

reduced damping due to oil leakage of 

the passenger door damper emergency 

opening actuator (DEOA). This 

proposed AD would require repetitively 

replacing certain forward and aft guide 

arms on the passenger door, inspecting 

the forward and aft guide arm support 

brackets for damage, modifying certain 

DEOAs, and repair if necessary. This 

proposed AD would also provide an 

optional terminating action for the 

repetitive replacements, 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 August 20, 

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– 

0545. 

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– 

0545; 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: 

Kathleen Arrigotti, Aerospace Engineer, 

Large Aircraft Section, International 

Validation Branch, FAA, 2200 South 

216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3218; email 

kathleen.arrigotti@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–2021–0545; Project Identifier 

MCAI–2021–00071–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 


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35414 Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules 

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 Kathleen Arrigotti, 

Aerospace Engineer, Large Aircraft 

Section, International Validation 

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

Moines, WA 98198; telephone and fax 

206–231–3218; email 

kathleen.arrigotti@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 2021–0085, 

dated March 19, 2021 (EASA AD 2021– 

0085) (also referred to as the Mandatory 

Continuing Airworthiness Information, 

or the MCAI), to correct an unsafe 

condition for all Airbus SAS Model 

A350–941 and –1041 airplanes. EASA 

AD 2021–0085 supersedes EASA AD 

2021–0018 dated 15 January 2021, 

retains all requirements and adds 

terminating action for the repetitive 

replacements. 

This proposed AD was prompted by 

a report of a broken forward guide arm 

found during a passenger door 

emergency opening test. Investigation 

results indicated that the opening speed 

of the door was higher than expected, 

likely caused by a reduced damping due 

to oil leakage of the passenger door 

DEOA. The FAA is proposing this AD 

to address failure of a passenger door to 

perform its intended function during an 

emergency opening, which could result 

in reduced evacuation capacity from the 

airplane and injury to occupants. See 

the MCAI for additional background 

information. 

Related Service Information Under 1 

CFR Part 51 

EASA AD 2021–0085 describes 

procedures for repetitively replacing the 

forward and aft guide arms following 

any passenger door emergency opening, 

modifying the airplane so that there is 

a maximum of one affected DEOA per 

door pair (left- and right-hand sides), 

inspecting the forward and aft guide 

arm support brackets for damage, and 

repair. EASA AD 2021–0085 also 

describes procedures for replacement of 

each affected DEOA having part number 

FE396001001, which is terminating 

action for the repetitive replacements. 

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 the ADDRESSES section. 

FAA’s Determination and Requirements 

of This Proposed AD 

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 referenced 

above. The FAA is proposing this AD 

because the FAA evaluated all the 

relevant information and determined 

the unsafe condition described 

previously is likely to exist or develop 

in other products of the same type 

design. 

Proposed AD Requirements 

This proposed AD would require 

accomplishing the actions specified in 

EASA AD 2021–0085 described 

previously, as incorporated by 

reference, except for any differences 

identified as exceptions in the 

regulatory text of this 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 

2021–0085 will be incorporated by 

reference in the FAA final rule. This 

proposed AD would, therefore, require 

compliance with EASA AD 2021–0085 

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 

the EASA AD 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 the EASA AD. Service 

information specified in EASA AD 

2021–0085 that is required for 

compliance with EASA AD 2021–0085 

will be available on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0545 after the FAA final 

rule is published. 

Costs of Compliance 

The FAA estimates that this proposed 

AD affects 15 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this proposed AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

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

operators 

Up to 93 work-hours × $85 per hour = Up to $7,905 ........... Up to $13,600 ....................... Up to $21,505 ....................... Up to $322,575. 

Modification ........................................................................... $0 .......................................... Up to $935 ............................ Up to $14,025. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition repairs specified in 

this proposed AD. 

According to the manufacturer, some 

or all of the costs of this proposed AD 

may be covered under warranty, thereby 


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Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules 35415 

reducing the cost impact on affected 

operators. The FAA does not control 

warranty coverage for affected operators. 

As a result, the FAA has included all 

known costs in the cost estimate. 

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: 

Airbus SAS: Docket No. FAA–2021–0545; 

Project Identifier MCAI–2021–00071–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by August 20, 

2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to all Airbus SAS Model 

A350–941 and –1041 airplanes, certificated 

in any category. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 52, Doors. 

(e) Reason 

This AD was prompted by a report of a 

broken forward guide arm found during a 

passenger door emergency opening test. 

Investigation results indicated that the 

opening speed of the door was higher than 

expected, likely caused by a reduced 

damping due to oil leakage of the passenger 

door damper emergency opening actuator 

(DEOA). The FAA is issuing this AD to 

address failure of a passenger door to perform 

its intended function during an emergency 

opening, which could result in reduced 

evacuation capacity from the airplane and 

injury to occupants. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Requirements 

Except as specified in paragraph (h) of this 

AD: Comply with all required actions and 

compliance times specified in, and in 

accordance with, European Union Aviation 

Safety Agency (EASA) EASA AD 2021–0085, 

dated March 19, 2021 (EASA AD 2021–0085). 

(h) Exceptions to EASA AD 2021–0085 

(1) Where EASA AD 2021–0085 refers to 

January 29, 2021 (the effective date of EASA 

AD 2021–0018), this AD requires using the 

effective date of this AD. 

(2) Where EASA AD 2021–0085 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(3) The ‘‘Remarks’’ section of EASA AD 

2021–0085 does not apply to this AD. 

(4) Where paragraphs (4) and (5) of EASA 

AD 2021–0085 refer to ‘‘the limits as defined 

in the inspection SB [service bulletin],’’ for 

this AD use ‘‘the limits as defined in ASR 

[aircraft structural repair] A350–A–51–73– 

11–01ZZZ–667Z–A.’’ 

(5) Where paragraphs (1) and (2) of EASA 

AD 2021–0085 specify to ‘‘replace the 

forward and aft guide arms on that door in 

accordance with the instructions of the 

inspection SB,’’ this AD requires ‘‘removing 

the forward and aft guide arms on that door, 

in accordance with the instructions of the 

inspections SB; doing a detailed inspection 

of the forward and aft guide arm support 

bracket on that door and all applicable 

corrective actions as specified in paragraphs 

(3) through (5) of EASA AD 2021–0085; and 

installing new forward and aft guide arms on 

that door, in accordance with the instructions 

of the inspections SB.’’ 

(i) No Reporting Requirement 

Although the service information 

referenced in EASA AD 2021–0085 specifies 

to submit certain information to the 

manufacturer, this AD does not include that 

requirement. 

(j) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, Large Aircraft 

Section, International Validation Branch, 

FAA, has the authority to approve AMOCs 

for this AD, if requested using the procedures 

found in 14 CFR 39.19. In accordance with 

14 CFR 39.19, send your request to your 

principal inspector or responsible Flight 

Standards Office, as appropriate. If sending 

information directly to the Large Aircraft 

Section, International Validation Branch, 

send it to the attention of the person 

identified in paragraph (k)(2) of this AD. 

Information may be emailed to: 9-AVS-AIR730-AMOC@faa.gov. Before using any 

approved AMOC, notify your appropriate 

principal inspector, or lacking a principal 

inspector, the manager of the responsible 

Flight Standards Office. 

(2) Contacting the Manufacturer: For any 

requirement in this AD to obtain instructions 

from a manufacturer, the instructions must 

be accomplished using a method approved 

by the Manager, Large Aircraft Section, 

International Validation Branch, FAA; or 

EASA; or Airbus SAS’s EASA Design 

Organization Approval (DOA). If approved by 

the DOA, the approval must include the 

DOA-authorized signature. 

(3) Required for Compliance (RC): Except 

as required by paragraph (j)(2) of this AD, if 

any service information contains procedures 

or tests that are identified as RC, those 

procedures and tests must be done to comply 

with this AD; any procedures or tests that are 

not identified as RC are recommended. Those 

procedures and tests that are not identified 

as RC may be deviated from using accepted 

methods in accordance with the operator’s 

maintenance or inspection program without 

obtaining approval of an AMOC, provided 

the procedures and tests identified as RC can 

be done and the airplane can be put back in 

an airworthy condition. Any substitutions or 

changes to procedures or tests identified as 

RC require approval of an AMOC. 

(k) Related Information 

(1) For information about EASA AD 2021– 

0085, 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 EASA AD on the EASA website at 

https://ad.easa.europa.eu. You may view this 

material at the FAA, Airworthiness Products 


jbell on DSKJLSW7X2PROD with PROPOSALS
35416 Federal Register / Vol. 86, No. 126 / Tuesday, July 6, 2021 / Proposed Rules 

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. This 

material may be found in the AD docket on 

the internet at https://www.regulations.gov 

by searching for and locating Docket No. 

FAA–2021–0545. 

(2) For more information about this AD, 

contact Kathleen Arrigotti, Aerospace 

Engineer, Large Aircraft Section, 

International Validation Branch, FAA, 2200 

South 216th St., Des Moines, WA 98198; 

telephone and fax 206–231–3218; email 

kathleen.arrigotti@faa.gov. 

Issued on June 29, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–14269 Filed 7–2–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0546; Project 

Identifier MCAI–2021–00387–P] 

RIN 2120–AA64 

Airworthiness Directives; Hoffmann 

GmbH & Co. KG Propellers 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Notice of proposed rulemaking 

(NPRM). 

SUMMARY: The FAA proposes to 

supersede Airworthiness Directive (AD) 

2020–25–05, which applies to all 

Hoffmann GmbH & Co. KG (Hoffmann) 

model HO–V 72 propellers. AD 2020– 

25–05 requires amending the existing 

aircraft flight manual (AFM) with 

abnormal propeller vibration 

instructions. AD 2020–25–05 also 

requires visual inspection and nondestructive test (NDT) inspection of the 

propeller hub and, depending on the 

results of the inspections, replacement 

of the propeller hub with a part eligible 

for installation. AD 2020–25–05 also 

requires replacement of the propeller 

hub before exceeding 30 years since the 

date of manufacture. Since the FAA 

issued AD 2020–25–05, analyses of the 

inspection results showed that the 30- 

year life limit of the propeller hub is no 

longer needed. This proposed AD would 

retain certain requirements of AD 2020– 

25–05 and remove the 30-year life limit 

of the propeller hub. 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 20, 

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 Hoffmann GmbH & 

Co. KG, Ku ̈pferlingstrasse 9, 83022, 

Rosenheim, Germany; phone: +49 0 

8031 1878 0; email: info@hoffmannprop.com; website: https://hoffmannprop.com. You may view this 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. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0546; 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 mandatory continuing 

airworthiness information (MCAI), any 

comments received, and other 

information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: 

Michael Schwetz, Aviation Safety 

Engineer, Boston ACO Branch, FAA, 

1200 District Avenue, Burlington, MA 

01803; phone: (781) 238–7761; fax: (781) 

238–7199; email: michael.schwetz@

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–2021–0546; Project Identifier 

MCAI–2021–00387–P’’ 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 we receive 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 Michael Schwetz, 

Aviation Safety Engineer, Boston ACO 

Branch, FAA, 1200 District Avenue, 

Burlington, MA 01803. Any 

commentary that the FAA receives 

which is not specifically designated as 

CBI will be placed in the public docket 

for this rulemaking. 

Background 

The FAA issued AD 2020–25–05, 

Amendment 39–21347 (85 FR 78702, 

December 7, 2020), (AD 2020–25–05), 

for all Hoffmann model HO–V 72 

propellers. AD 2020–25–05 was 

prompted by reports of cracks at 

different positions on two affected 

propeller hubs. AD 2020–25–05 requires 

amending the existing AFM with 

abnormal propeller vibration 

instructions. AD 2020–25–05 also 

requires visual inspection and NDT 

inspection of the propeller hub and, 

depending on the results of the 

inspections, replacement of the 

propeller hub with a part eligible for 

installation. AD 2020–25–05 also 

requires replacement of the propeller 

hub before exceeding 30 years since the 

date of manufacture or within 30 days 

after the effective date of AD 2020–25– 

05, whichever occurs later. The agency 

issued AD 2020–25–05 to prevent 

failure of the propeller hub. 


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