Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 1349 

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. 

(j) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) TCCA AD 

CF–2020–44, dated October 23, 2020, for 

related information. This MCAI may be 

found in the AD docket on the internet at 

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

and locating Docket No. FAA–2021–0784. 

(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. 

(k) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless this AD specifies otherwise. 

(i) Bombardier Challenger 600 Time 

Limits/Maintenance Checks (TLMC), Product 

Support Publication (PSP) 605, Temporary 

Revision (TR) 5–163, dated April 30, 2020. 

(ii) Bombardier Challenger 601 TLMC, PSP 

601–5, TR 5–267, dated April 30, 2020. 

(iii) Bombardier Challenger 601 TLMC, 

PSP 601A–5, TR 5–281, dated April 30, 2020. 

(iv) Section 5–10–30, Airworthiness 

Limitation Items, of the Bombardier 

Challenger 604 TLMC, Publication No. CH 

604 TLMC, Part 2, Revision 32, dated 

December 18, 2019. 

(v) Section 5–10–30, Airworthiness 

Limitation Items, of the Bombardier 

Challenger 605 TLMC, Publication No. CH 

605 TLMC, Part 2, Revision 21, dated 

December 18, 2019. 

(vi) Section 5–10–30, Airworthiness 

Limitation Items, of the Bombardier 

Challenger 650 TLMC, Publication No. CH 

650 TLMC, Part 2, Revision 8, dated 

December 18, 2019. 

(3) For service information identified in 

this AD, contact Bombardier Business 

Aircraft Customer Response Center, 400 Coˆte 

Vertu Road West, Dorval, Que ́bec H4S 1Y9, 

Canada; 514–855–2999; email ac.yul@

aero.bombardier.com; internet https://

www.bombardier.com. 

(4) 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. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

email fr.inspection@nara.gov, or go to: http:// 

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on December 3, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2021–28567 Filed 1–10–22; 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; Amendment 

39–21835; AD 2021–24–14] 

RIN 2120–AA64 

Airworthiness Directives; The Boeing 

Company Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), DOT. 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

The Boeing Company Model 787–8, 

787–9, and 787–10 airplanes. 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 could reduce the 

fatigue life of the slider below its full 

design life for the TRs installed on 

certain engines. This AD requires 

determining the serial number of the TR 

and performing applicable on-condition 

actions; or replacing the TR with a 

serviceable TR. The FAA is issuing this 

AD to address the unsafe condition on 

these products. 

DATES: This AD is effective February 15, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of a certain publication listed in this AD 

as of February 15, 2022. 

ADDRESSES: For service information 

identified in this final rule, 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 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 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 

final rule, any comments received, and 

other information. The address for 

Docket Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

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: 

Background 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain The Boeing Company 

Model 787–8, 787–9, and 787–10 

airplanes. The NPRM published in the 

Federal Register on August 9, 2021 (86 

FR 43443). The NPRM was prompted by 

reports of damage to the TR translating 

sleeve secondary sliders due to contact 

between the slider and the slider track 

liner. This damage was found on TR 

sleeves installed only on certain 

engines. In the NPRM, the FAA 

proposed to 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 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 


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1350 Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 

in reduced control or performance of the 

airplane. 

Discussion of Final Airworthiness 

Directive 

Comments 

The FAA received a comment from 

the Air Line Pilots Association, 

International (ALPA), who supported 

the NPRM without change. 

The FAA received additional 

comments from one commenter, Boeing. 

The following presents the comments 

received on the NPRM and the FAA’s 

response to each comment. 

Request To Clarify Unsafe Condition 

The Background section of the NPRM 

and paragraph (e) of the proposed AD 

stated that damage was found on TR 

sleeves installed only on certain 

engines. Boeing requested that the FAA 

clarify the description of the unsafe 

condition to state that this damage can 

result in an unsafe condition on TR 

sleeves installed on certain engines. 

Boeing added that, although this 

damage (gouging and grooving) is 

possible on pre- and post-mission 

improvement TRs installed on General 

Electric and Rolls-Royce engines, it was 

determined by the Boeing safety process 

that the damage could result in an 

unsafe condition only for the mission 

improvement TRs on Rolls-Royce 

engines. 

The FAA agrees with Boeing’s 

assertions, but disagrees with the 

proposed wording because it does not 

explain why the TRs installed on certain 

other engines are not affected by this 

safety issue. To clarify the description of 

the unsafe condition, the FAA has 

revised the SUMMARY and paragraph (e) 

of this AD to indicate that damage to the 

TR translating sleeve secondary sliders 

could reduce the fatigue life of the slider 

below its full design life for the TRs 

installed on certain engines. 

Conclusion 

The FAA reviewed the relevant data, 

considered any comments received, and 

determined that air safety requires 

adopting this AD as proposed. Except 

for minor editorial changes, and any 

other changes described previously, this 

AD is adopted as proposed in the 

NPRM. None of the changes will 

increase the economic burden on any 

operator. 

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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 14 airplanes of U.S. registry. The 

FAA estimates the following costs to 

comply with this 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 the following on-condition 

actions. 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 

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 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 


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Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 1351 

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 AD will not have federalism 

implications under Executive Order 

13132. This AD will 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 that this AD: 

(1) Is not a ‘‘significant regulatory 

action’’ under Executive Order 12866, 

(2) Will not affect intrastate aviation 

in Alaska, and 

(3) Will 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 Amendment 

Accordingly, under the authority 

delegated to me by the Administrator, 

the FAA amends 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: 

2021–24–14 The Boeing Company: 

Amendment 39–21835; Docket No. 

FAA–2021–0571; Project Identifier AD– 

2021–00101–T. 

(a) Effective Date 

This airworthiness directive (AD) is 

effective February 15, 2022. 

(b) Affected ADs 

None. 

(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 could reduce the fatigue life of 

the slider below its full design life for the 

TRs 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 


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1352 Federal Register / Vol. 87, No. 7 / Tuesday, January 11, 2022 / Rules and Regulations 

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 

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. 

(l) Material Incorporated by Reference 

(1) The Director of the Federal Register 

approved the incorporation by reference 

(IBR) of the service information listed in this 

paragraph under 5 U.S.C. 552(a) and 1 CFR 

part 51. 

(2) You must use this service information 

as applicable to do the actions required by 

this AD, unless the AD specifies otherwise. 

(i) Boeing Alert Requirements Bulletin 

B787–81205–SB780043–00 RB, Issue 001, 

dated January 15, 2021. 

(ii) [Reserved] 

(3) 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. 

(4) 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. 

(5) You may view this service information 

that is incorporated by reference at the 

National Archives and Records 

Administration (NARA). For information on 

the availability of this material at NARA, 

fr.inspection@nara.gov, or go to: https://

www.archives.gov/federal-register/cfr/ibrlocations.html. 

Issued on November 17, 2021. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2022–00038 Filed 1–10–22; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2021–0658; Project 

Identifier MCAI–2020–01582–T; Amendment 

39–21850; AD 2021–25–07] 

RIN 2120–AA64 

Airworthiness Directives; Bombardier, 

Inc., Airplanes 

AGENCY: Federal Aviation 

Administration (FAA), Department of 

Transportation (DOT). 

ACTION: Final rule. 

SUMMARY: The FAA is adopting a new 

airworthiness directive (AD) for certain 

Bombardier, Inc., Model BD–100–1A10 

airplanes. 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). 

This AD requires inspecting the lefthand and right-hand MLG side stay 

actuator assembly pin nut for the 

presence of a lockwire, and installing a 

lockwire if necessary. The FAA is 

issuing this AD to address the unsafe 

condition on these products. 

DATES: This AD is effective February 15, 

2022. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of February 15, 2022. 

ADDRESSES: For service information 

identified in this final rule, contact 

Bombardier, Inc., 200 Coˆte-Vertu 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. 

It is also available on the internet at 

https://www.regulations.gov by 

searching for and locating Docket No. 

FAA–2021–0658. 

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– 

0658; 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 final rule, 

any comments received, and other 

information. The address for Docket 

Operations is U.S. Department of 

Transportation, Docket Operations, M– 

30, West Building Ground Floor, Room 

W12–140, 1200 New Jersey Avenue SE, 

Washington, DC 20590. 

FOR FURTHER INFORMATION 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. 

SUPPLEMENTARY INFORMATION: 

Background 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued TCCA AD CF– 

2020–52, dated November 30, 2020 (also 

referred to after this as the Mandatory 

Continuing Airworthiness Information, 

or the MCAI), to correct an unsafe 

condition for certain Bombardier, Inc., 

Model BD–100–1A10 airplanes. You 

may examine the MCAI in the AD 

docket on the internet at https://

www.regulations.gov by searching for 

and locating Docket No. FAA–2021– 

0658. 

The FAA issued a notice of proposed 

rulemaking (NPRM) to amend 14 CFR 

part 39 by adding an AD that would 

apply to certain Bombardier, Inc., Model 

BD–100–1A10 airplanes. The NPRM 

published in the Federal Register on 

August 12, 2021 (86 FR 44314). The 

NPRM was prompted by a discovery 

that a lockwire may not have been 

installed on the side stay actuator pin 

nut of the MLG. The NPRM proposed to 

require inspecting the left-hand and 

right-hand MLG side stay actuator 

assembly pin nut for the presence of a 

lockwire, and installing a lockwire if 

necessary. 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. See the MCAI for 

additional background information. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this final rule. The FAA received no 

comments on the NPRM or on the 

determination of the cost to the public. 

Conclusion 

The FAA reviewed the relevant data 

and determined that air safety and the 

public interest require adopting this 

final rule as proposed, except for minor 

editorial changes. The FAA has 

determined that these minor changes: 

• Are consistent with the intent that 

was proposed in the NPRM for 

addressing the unsafe condition; and 

• Do not add any additional burden 

upon the public than was already 

proposed in the NPRM. 

Related Service Information Under 1 

CFR Part 51 

Bombardier has issued Service 

Bulletin 100–32–36, dated June 25, 

2020; and Service Bulletin 350–32–012, 

dated June 25, 2020. This service 

information describes procedures for 

inspecting the left-hand and right-hand 

MLG side stay actuator assembly pin 

nut for presence of a lockwire and 

installing a lockwire. These documents 


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