Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules 43443 

(h) Exceptions to EASA AD 2021–0093 

(1) Where EASA AD 2021–0093 refers to its 

effective date, this AD requires using the 

effective date of this AD. 

(2) The requirements specified in 

paragraphs (1) and (2) of EASA AD 2021– 

0093 do not apply to this AD. 

(3) Paragraph (3) of EASA AD 2021–0093 

specifies revising ‘‘the approved AMP’’ 

within 12 months after its effective date, but 

this AD requires revising the existing 

maintenance or inspection program, as 

applicable within 90 days after the effective 

date of this AD. 

(4) The initial compliance time for doing 

the tasks specified in paragraph (3) of EASA 

2021–0093 is at the applicable ‘‘thresholds’’ 

as incorporated by the requirements of 

paragraph (3) of EASA AD 2021–0093, or 

within 90 days after the effective date of this 

AD, whichever occurs later. 

(5) The provisions specified in paragraphs 

(4) of EASA AD 2021–0093 do not apply to 

this AD. 

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

2021–0093 does not apply to this AD. 

(i) Provisions for Alternative Actions and 

Intervals 

After the existing maintenance or 

inspection program has been revised as 

required by paragraph (g) of this AD, no 

alternative actions (e.g., inspections) or 

intervals are allowed unless they are 

approved as specified in the provisions of the 

‘‘Ref. Publications’’ section of EASA AD 

2021–0093. 

(j) Terminating Action for Certain 

Requirements of AD 2019–21–01 and AD 

2020–23–11 

(1) Accomplishing the actions required by 

this AD terminates the corresponding 

requirements of AD 2019–21–01, for the tasks 

identified in the service information referred 

to in EASA AD 2021–0093 only. 

(2) Accomplishing the actions required by 

this AD terminates the corresponding 

requirements of AD 2020–23–11, for the tasks 

identified in the service information referred 

to in EASA AD 2021–0093 only. 

(k) 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 local Flight Standards 

District 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 (l)(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 local flight 

standards district office/certificate holding 

district 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 (k)(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. 

(l) Related Information 

(1) For information about EASA AD 2021– 

0093, 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 

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–2021–0617. 

(2) For more information about this AD, 

contact Dan Rodina, Aerospace Engineer, 

Large Aircraft Section, International 

Validation Branch, FAA, 2200 South 216th 

St., Des Moines, WA 98198; telephone and 

fax 206–231–3225; email dan.rodina@

faa.gov. 

Issued on July 29, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16559 Filed 8–6–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0571; Project 

Identifier AD–2021–00101–T] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company 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 The Boeing Company Model 

787–8, 787–9, and 787–10 airplanes. 

This proposed AD was prompted by 

reports of damage to the thrust reverser 

(TR) translating sleeve secondary sliders 

due to contact between the slider and 

the slider track liner. This damage was 

only found on TR sleeves installed on 

certain engines. This proposed AD 

would require determining the serial 

number of the TR and performing 

applicable on-condition actions; or 

replacing the TR with a serviceable TR. 

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 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 Boeing Commercial 

Airplanes, Attention: Contractual & Data 

Services (C&DS), 2600 Westminster 

Blvd., MC 110–SK57, Seal Beach, CA 

90740–5600; telephone 562–797–1717; 

internet https://

www.myboeingfleet.com. You may view 

this referenced service information at 

the FAA, Airworthiness Products 

Section, Operational Safety Branch, 

2200 South 216th St., Des Moines, WA. 

For information on the availability of 

this material at the FAA, call 206–231– 

3195. It is also available on the internet 

at https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0571. 

Examining the AD Docket 

You may examine the AD docket at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0571; 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 


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43444 Federal Register / Vol. 86, No. 150 / Monday, August 9, 2021 / Proposed Rules 

NPRM, any comments received, and 

other information. The street address for 

Docket Operations is listed above. 

FOR FURTHER INFORMATION CONTACT: Tak 

Kobayashi, Aerospace Engineer, 

Propulsion Section, FAA, Seattle ACO 

Branch, 2200 South 216th St., Des 

Moines, WA 98198; phone and fax: 206– 

231–3553; email: takahisa.kobayashi@

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–2021–0571; Project Identifier AD– 

2021–00101–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 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 Tak Kobayashi, 

Aerospace Engineer, Propulsion 

Section, FAA, Seattle ACO Branch, 2200 

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

phone and fax: 206–231–3553; email: 

takahisa.kobayashi@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 

The FAA has received reports of 

damage to the TR translating sleeve 

secondary sliders. Gouging damage to 

the slider end and grooving damage 

along the length of the slider occurred 

due to contact between the slider and 

the slider track liner. This damage was 

found only on TR sleeves installed on 

Rolls-Royce engines with mission 

improvement configuration thrust 

reversers. This damage, if not addressed, 

could result in failure of the TR 

translating sleeve secondary slider and 

possible detachment of the outer cowl, 

which could strike the fuselage causing 

damage to the airplane, and could result 

in reduced control or performance of the 

airplane. 

FAA’s Determination 

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. 

Related Service Information Under 1 

CFR Part 51 

The FAA reviewed Boeing Alert 

Requirements Bulletin B787–81205– 

SB780043–00 RB, Issue 001, dated 

January 15, 2021. This service 

information specifies procedures for 

determining the serial number of the 

TR, and applicable on-condition 

actions; or replacing the TR with a 

serviceable TR. On-condition actions 

include reworking affected TR slider 

track liners; determining the serial 

number of the TR translating sleeves; 

checking to determine if certain TR 

translating sleeves have been installed 

on certain TRs; performing a detailed 

inspection of the secondary sliders of 

affected TR translating sleeves for 

cracking, grooving, gouging damage, and 

any existing repair; performing a dye 

penetrant inspection on any cracking, 

grooving or gouging damage, and any 

existing repair for cracking; and 

repairing any discrepancy found. 

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 ADDRESSES. 

Proposed AD Requirements in This 

NPRM 

This proposed AD would require 

accomplishing the actions specified in 

the service information already 

described, except for any differences 

identified as exceptions in the 

regulatory text of this proposed AD. For 

information on the procedures and 

compliance times, see this service 

information at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0571. 

Explanation of Requirements Bulletin 

The FAA worked in conjunction with 

industry, under the Airworthiness 

Directive Implementation Aviation 

Rulemaking Committee (AD ARC), to 

enhance the AD system. One 

enhancement is a process for annotating 

which steps in the service information 

are ‘‘required for compliance’’ (RC) with 

an AD. Boeing has implemented this RC 

concept into Boeing service bulletins. 

In an effort to further improve the 

quality of ADs and AD-related Boeing 

service information, a joint process 

improvement initiative was worked 

between the FAA and Boeing. The 

initiative resulted in the development of 

a new process in which the service 

information more clearly identifies the 

actions needed to address the unsafe 

condition in the ‘‘Accomplishment 

Instructions.’’ The new process results 

in a Boeing Requirements Bulletin, 

which contains only the actions needed 

to address the unsafe condition (i.e., 

only the RC actions). 

Differences Between This Proposed AD 

and the Service Information 

The effectivity of Boeing Alert 

Requirements Bulletin B787–81205– 

SB780043–00 RB, Issue 001, dated 

January 15, 2021, includes all Model 

787–8, 787–9, and 787–10 airplanes 

equipped with Rolls-Royce engines. 

This proposed AD would only require 

accomplishing the actions specified in 

Boeing Alert Requirements Bulletin 

B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021, on 

airplanes with an original airworthiness 

certificate or original export certificate 

of airworthiness issued on or before the 

effective date of this AD. Airplanes 

certificated after the effective date of 

this AD will not be delivered with 

affected TRs or TR translating sleeves. 

However, because the affected TRs and 

TR translating sleeves are rotable parts, 

the FAA has determined that these parts 

could later be installed on airplanes 

delivered with acceptable parts, thereby 

subjecting those airplanes to the unsafe 

condition. This proposed AD would 

therefore include a parts installation 

prohibition applicable to all Model 787– 

8, 787–9, and 787–10 airplanes 

equipped with Rolls-Royce engines. 

Furthermore, the FAA has determined 

that a parts installation prohibition 

needs to be specified for airplanes on 


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which the corrective actions required by 

this proposed AD have been 

accomplished. In general, such a 

prohibition is not necessary since an 

airplane that is credited for compliance 

with an AD requirement must be 

maintained at the AD-compliant 

configuration. However, the corrective 

actions required by this AD are 

accomplished on the TRs and TR 

translating sleeves, and those parts can 

be moved from one airplane to another 

as part of regular maintenance activities. 

To prevent inadvertent maintenance 

where an AD-compliant airplane is reconfigured to a non-compliant 

configuration by installing a TR or TR 

translating sleeve on which the 

corrective actions have not been 

accomplished, this proposed AD would 

explicitly specify a parts installation 

prohibition for those airplanes that have 

complied with an AD requirement. 

Costs of Compliance 

The FAA estimates that this AD, if 

adopted as proposed, would affect 14 

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 

Serial number inspection ................................ 6 work-hours × $85 per hour = $510 ............. $0 $510 Up to $7,140. 

Replacement (per ...........................................

T/R half) ..........................................................

12 work-hours × $85 per hour $1,020 ........... 0 1,020 Up to $14,280. 

The FAA estimates the following 

costs to do any necessary on-condition 

repairs, dye-penetrant inspections, TR 

sleeve serial number checks, or checks 

to determine if certain TR sleeves have 

been installed on certain TRs, that 

would be required. The FAA has no way 

of determining the number of aircraft 

that might need these on-condition 

actions: 

ESTIMATED COSTS OF ON-CONDITION ACTIONS

Action Labor cost Parts cost Cost per 

product 

Repair ........................................................................... Up to 100 work-hours × $85 per hour = Up to $8,500 $0 Up to $8,500. 

Dye-penetrant inspection .............................................. Up to 4 work-hours × $85 per hour = Up to $340 ....... 0 Up to $340. 

TR sleeve serial number check .................................... 1 work-hour × $85 per hour = $85 .............................. 0 $85. 

Check to determine if TR translating sleeve has been 

installed on certain TRs.

1 work-hour × $85 per hour = $85 .............................. 0 $85. 

The FAA has received no definitive 

data on which to base the cost estimates 

for the on-condition rework and 

detailed inspections specified in this 

proposed AD. 

The FAA has included all known 

costs in its cost estimate. According to 

the manufacturer, however, some or all 

of the costs of this proposed AD may be 

covered under warranty, thereby 

reducing the cost impact on affected 

operators. 

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: 

The Boeing Company: Docket No. FAA– 

2021–0571; Project Identifier AD–2021– 

00101–T. 

(a) Comments Due Date 

The FAA must receive comments on this 

airworthiness directive (AD) by September 

23, 2021. 

(b) Affected ADs 

None. 


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(c) Applicability 

This AD applies to The Boeing Company 

Model 787–8, 787–9, and 787–10 airplanes, 

certificated in any category, powered by 

Rolls-Royce Trent 1000 engines. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 78, Thrust Reverser. 

(e) Unsafe Condition 

This AD was prompted by reports of 

damage to the thrust reverser (TR) translating 

sleeve secondary sliders due to contact 

between the slider and the slider track liner. 

This damage was only found on TR sleeves 

installed on certain engines. The FAA is 

issuing this AD to address this damage, 

which could result in failure of the TR 

translating sleeve secondary slider and 

possible detachment of the outer cowl, which 

could strike the fuselage, causing damage to 

the airplane, and could result in reduced 

control or performance of the airplane. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Required Actions 

For airplanes with an original 

airworthiness certificate or original export 

certificate of airworthiness issued on or 

before the effective date of this AD: Except 

as specified by paragraph (h) of this AD; at 

the applicable times specified in the 

‘‘Compliance’’ paragraph of Boeing Alert 

Requirements Bulletin B787–81205– 

SB780043–00 RB, Issue 001, dated January 

15, 2021, do all applicable actions for Group 

1, Configuration 1 airplanes as identified in, 

and in accordance with, the Accomplishment 

Instructions of Boeing Alert Requirements 

Bulletin B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021. 

Note 1 to paragraph (g): Guidance for 

accomplishing the actions required by this 

AD can be found in Boeing Alert Service 

Bulletin B787–81205–SB780043–00, Issue 

001, dated January 15, 2021, which is 

referred to in Boeing Alert Requirements 

Bulletin B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021. 

(h) Exceptions to Service Information 

Specifications 

(1) Where Boeing Alert Requirements 

Bulletin B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021, uses the phrase 

‘‘the issue 001 date of Requirements Bulletin 

B787–81205–SB780043–00 RB,’’ this AD 

requires using ‘‘the effective date of this AD.’’ 

(2) Where Boeing Alert Requirements 

Bulletin B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021, specifies 

contacting Boeing for repair instructions or 

for instructions to address certain conditions: 

This AD requires doing the repair or doing 

the instructions using a method approved in 

accordance with the procedures specified in 

paragraph (j) of this AD. 

(i) Parts Installation Limitations 

(1) As of the applicable compliance time 

specified in paragraph (i)(1)(i) or (ii) of this 

AD, no person may install on any airplane a 

TR with serial number between 00110001 

and 00312001 inclusive, on which all 

applicable inspections and corrective actions 

required by paragraph (g) of this AD have not 

been accomplished. 

(i) For airplanes with an original 

airworthiness certificate or original export 

certificate of airworthiness issued on or 

before the effective date of this AD: After 

accomplishing the actions required by 

paragraph (g) of this AD. 

(ii) For airplanes with an original 

airworthiness certificate or original export 

certificate of airworthiness issued after the 

effective date of this AD: As of the effective 

date of this AD. 

(2) As of the applicable compliance time 

specified in paragraph (i)(2)(i) or (ii) of this 

AD, no person may install on any airplane a 

TR translating sleeve with serial number 

00125001 and subsequent, on which all 

applicable inspections and corrective actions 

required by paragraph (g) of this AD have not 

been accomplished. 

(i) For airplanes with an original 

airworthiness certificate or original export 

certificate of airworthiness issued on or 

before the effective date of this AD: After 

accomplishing the actions required by 

paragraph (g) of this AD. 

(ii) For airplanes with an original 

airworthiness certificate or original export 

certificate of airworthiness issued after the 

effective date of this AD: As of the effective 

date of this AD. 

(3) As of the effective date of this AD, no 

person may install a TR translating sleeve 

that was originally installed on any airplane 

with an original airworthiness certificate or 

original export certificate of airworthiness 

issued after the effective date of this AD; or 

a TR translating sleeve with serial number 

00125001 and subsequent, on which all 

applicable inspections and corrective actions 

specified in Boeing Alert Requirements 

Bulletin B787–81205–SB780043–00 RB, Issue 

001, dated January 15, 2021, have been 

accomplished; on any airplane with a TR 

with a serial number between 00110001 and 

00312001 inclusive, unless all applicable 

inspections and corrective actions specified 

in Boeing Alert Requirements Bulletin B787– 

81205–SB780043–00 RB, Issue 001, dated 

January 15, 2021, have been accomplished on 

that TR, except as specified in paragraph 

(h)(2) of this AD. 

(j) Alternative Methods of Compliance 

(AMOCs) 

(1) The Manager, Seattle 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 the attention of 

the person identified in Related Information. 

Information may be emailed to: 9-ANMSeattle-ACO-AMOC-Requests@faa.gov. 

(2) Before using any approved AMOC, 

notify your appropriate principal inspector, 

or lacking a principal inspector, the manager 

of the responsible Flight Standards Office. 

(3) An AMOC that provides an acceptable 

level of safety may be used for any repair, 

modification, or alteration required by this 

AD if it is approved by The Boeing Company 

Organization Designation Authorization 

(ODA) that has been authorized by the 

Manager, Seattle ACO Branch, FAA, to make 

those findings. To be approved, the repair 

method, modification deviation, or alteration 

deviation must meet the certification basis of 

the airplane, and the approval must 

specifically refer to this AD. 

(k) Related Information 

(1) For more information about this AD, 

contact Tak Kobayashi, Aerospace Engineer, 

Propulsion Section, FAA, Seattle ACO 

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

WA 98198; phone and fax: 206–231–3553; 

email: takahisa.kobayashi@faa.gov. 

(2) For service information identified in 

this AD, contact Boeing Commercial 

Airplanes, Attention: Contractual & Data 

Services (C&DS), 2600 Westminster Blvd., 

MC 110–SK57, Seal Beach, CA 90740–5600; 

telephone 562–797–1717; internet https://

www.myboeingfleet.com. You may view this 

referenced 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 July 13, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–16680 Filed 8–6–21; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0213; Project 

Identifier 2018–CE–036–AD] 

RIN 2120–AA64 

Airworthiness Directives; Pacific 

Aerospace Limited 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 Pacific Aerospace Limited 

Model 750XL airplanes. This proposed 

AD results from mandatory continuing 

airworthiness information (MCAI) 

originated by an aviation authority of 

another country to identify and correct 

an unsafe condition on an aviation 

product. The MCAI identifies the unsafe 

condition as insufficient separation of 

ground terminations for individual 

power sources and static grounds. This 

proposed AD would require inspecting 

and separating, if applicable, the battery 


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