Federal Register / Vol. 85, No. 247 / Wednesday, December 23, 2020 / Rules and Regulations 83759 

(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 fedreg.legal@nara.gov, or go to: https:// 

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

Issued on December 9, 2020. 

Lance T. Gant, 

Director, Compliance & Airworthiness 

Division, Aircraft Certification Service. 

[FR Doc. 2020–28268 Filed 12–22–20; 8:45 am] 

BILLING CODE 4910–13–P 

DEPARTMENT OF TRANSPORTATION 

Federal Aviation Administration 

14 CFR Part 39 

[Docket No. FAA–2020–0458; Product 

Identifier 2020–NM–029–AD; Amendment 

39–21348; AD 2020–25–06] 

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 

report that corrosion was found on the 

shock strut cylinders during 

unscheduled maintenance of the nose 

landing gear (NLG). This AD requires a 

modification of the NLG shock strut 

cylinder. The FAA is issuing this AD to 

address the unsafe condition on these 

products. 

DATES: This AD is effective January 27, 

2021. 

The Director of the Federal Register 

approved the incorporation by reference 

of certain publications listed in this AD 

as of January 27, 2021. 

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 http://

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–2020–0458. 

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–2020– 

0458; 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: 

Darren Gassetto, Aerospace Engineer, 

Mechanical Systems and Administrative 

Services Section, FAA, New York ACO 

Branch, 1600 Stewart Avenue, Suite 

410, Westbury, NY 11590; telephone 

516–228–7323; fax 516–794–5531; email 

9-avs-nyaco-cos@faa.gov. 

SUPPLEMENTARY INFORMATION: 

Discussion 

Transport Canada Civil Aviation 

(TCCA), which is the aviation authority 

for Canada, has issued Canadian AD 

CF–2019–43, dated November 8, 2019 

(‘‘AD CF–2019–43’’) (also referred to 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–2020–0458. 

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 

June 3, 2020 (85 FR 34141). The NPRM 

was prompted by a report that corrosion 

was found on the shock strut cylinders 

during unscheduled maintenance of the 

NLG. The NPRM proposed to require a 

modification of the NLG shock strut 

cylinder. The FAA is issuing this AD to 

address corrosion of the NLG, which 

could result in structural failure of the 

NLG. See the MCAI for additional 

background information. 

Comments 

The FAA gave the public the 

opportunity to participate in developing 

this final rule. The following presents 

the comment received on the NPRM and 

the FAA’s response to that comment. 

Request To Revise Certain Compliance 

Language in the Proposed AD 

Flexjet stated that where the 

compliance section of Bombardier 

Service Bulletin 100–32–33, Revision 

02, dated September 30, 2019, and 

Figure 1 to paragraph (g) of the 

proposed AD, specify the compliance 

time for NLG assemblies with more than 

96 months time since new (TSN), the 

compliance time does not take into 

account that the NLG cylinders with 

part number (P/N) 40640–3 and P/N 

40640–5 serialized (next higher 

assembly P/N 40640–105 and 

subcomponents) are life-limited items 

with a 7,500 flight cycle discard 

interval. Flexjet commented that during 

the first 96 month inspection, if the 

operator has high flight cycles, it may 

elect to replace the cylinder at that time. 

Flexjet also commented that the 

compliance section of Bombardier 

Service Bulletin 100–32–33, Revision 

02, dated September 30, 2019, does not 

take into account that a new cylinder 

could be installed at the 96-month 

inspection and it also does not address 

if the cylinder was replaced for another 

reason after the 96-month inspection. 

Flexjet stated that the proposed AD 

needs to be specific on applying to the 

nose gear cylinder and sleeve part 

numbers and not the nose gear or nose 

gear strut assembly part numbers. 

Flexjet also stated that the nose gear 

cylinder and sleeve are the parts with 

corrosion and the primary reason for the 

service information. Flexjet pointed out 

that the sleeve is cut off for inspection 

of the cylinder and the same part 

number sleeve goes back on following 

the inspection. The FAA infers that 

Flexjet was requesting that the language 

in paragraphs (g)(1) and (2) of this AD 

specify that the actions apply to 

airplanes with NLG assemblies having 

NLG cylinder assemblies and sleeves 

with certain part numbers. 

The FAA disagrees with the comment. 

While NLG cylinder assemblies and 

their subcomponents can be replaced 

before or after the 96-month interval 

inspection, paragraphs 2.B. and 2.C. of 

the Accomplishment Instructions of 

Bombardier Service Bulletin 100–32–33, 

Revision 02, dated September 30, 2019, 

ensure the proper corrective actions are 

taken to prevent corrosion with those 

replaced components when reassembled 

on the NLG assembly. This is why the 

identification on the NLG assembly 

modplate is required. In addition, 

paragraph (f) of this AD specifies to, 

‘‘Comply with this AD within the 

compliance times specified, unless 

already done.’’ Therefore, if some of the 

specified corrective actions are already 


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83760 Federal Register / Vol. 85, No. 247 / Wednesday, December 23, 2020 / Rules and Regulations 

complied with, only the remaining 

corrective actions in the AD need to be 

completed to comply with this AD. The 

FAA has not changed this AD in this 

regard. 

Conclusion 

The FAA reviewed the relevant data, 

considered the comment received, 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 100–32–33, Revision 02, dated 

September 30, 2019; and Service 

Bulletin 350–32–009, Revision 02, dated 

September 30, 2019. This service 

information describes procedures for 

modification of the NLG shock strut 

cylinder. These documents are distinct 

since they apply to different airplane 

serial numbers. 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. 

Costs of Compliance 

The FAA estimates that this AD 

affects 560 airplanes of U.S. registry. 

The FAA estimates the following costs 

to comply with this AD: 

ESTIMATED COSTS FOR REQUIRED ACTIONS

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

operators 

Up to 54 work-hours × $85 per hour = Up to $4,590 ....................... $43,999 Up to $48,589 ............................. Up to $27,209,840 

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 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. 

Adoption of 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 (AD): 

2020–25–06 Bombardier, Inc.: Amendment 

39–21348; Docket No. FAA–2020–0458; 

Product Identifier 2020–NM–029–AD. 

(a) Effective Date 

This AD is effective January 27, 2021. 

(b) Affected ADs 

None. 

(c) Applicability 

This AD applies to Bombardier, Inc., 

Model BD–100–1A10 airplanes, certificated 

in any category, serial numbers (S/Ns) 20003 

through 20767 inclusive. 

(d) Subject 

Air Transport Association (ATA) of 

America Code 32, Landing gear. 

(e) Reason 

This AD was prompted by a report that 

corrosion was found on the shock strut 

cylinders during unscheduled maintenance 

of the nose landing gear (NLG). The FAA is 

issuing this AD to address corrosion of the 

NLG, which could result in structural failure 

of the NLG. 

(f) Compliance 

Comply with this AD within the 

compliance times specified, unless already 

done. 

(g) Modification for Airplanes With S/N 

20003 Through 20500 Inclusive 

For Bombardier, Inc., Model BD–100–1A10 

airplanes with S/N 20003 through 20500 

inclusive: At the applicable compliance time 

specified in paragraph (g)(1) or (2) of this AD, 

do the modification in paragraph (g)(1) or (2) 

of this AD, as applicable. 

(1) For airplanes with NLG assemblies with 

96 months or less time since new (TSN) as 

of the effective date of this AD: At the NLG 

96-month scheduled inspection, do a 

modification of the NLG shock strut cylinder, 

in accordance with paragraph 2.B. of the 

Accomplishment Instructions of Bombardier 

Service Bulletin 100–32–33, Revision 02, 

dated September 30, 2019. 

(2) For airplanes with NLG assemblies with 

more than 96 months TSN as of the effective 

date of this AD: At the applicable compliance 

time specified in figure 1 to paragraph (g) of 

this AD, do a modification of the NLG shock 

strut cylinder, in accordance with paragraph 

2.C. of the Accomplishment Instructions of 

Bombardier Service Bulletin 100–32–33, 

Revision 02, dated September 30, 2019. 


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Federal Register / Vol. 85, No. 247 / Wednesday, December 23, 2020 / Rules and Regulations 83761 

(h) Modification for Airplanes With S/N 

20501 Through 20767 Inclusive 

For Bombardier, Inc., Model BD–100–1A10 

airplanes with S/N 20501 through 20767 

inclusive: At the NLG 96-month scheduled 

inspection, do a modification of the NLG 

shock strut cylinder, in accordance with 

paragraph 2.B. of the Accomplishment 

Instructions of Bombardier Service Bulletin 

350–32–009, Revision 02, dated September 

30, 2019. 

(i) Parts Installation Limitation 

As of the effective date of this AD, no 

person may install, on any airplane, an NLG 

shock strut assembly with part number (P/N) 

40630–111, P/N 40630–113, or P/N 44630– 

101, unless it has been modified in 

accordance with paragraphs 2.B. or 2.C. of 

the Accomplishment Instructions of 

Bombardier Service Bulletin 100–32–33, 

Revision 02, dated September 30, 2019; or 

paragraph 2.B. of the Accomplishment 

Instructions of Bombardier Service Bulletin 

350–32–009, Revision 02, dated September 

30, 2019; as applicable. 

(j) Credit for Previous Actions 

(1) This paragraph provides credit for 

actions required by paragraph (g) of this AD, 

if those actions were performed before the 

effective date of this AD using paragraph 2.B. 

or 2.C., as applicable, of Bombardier Service 

Bulletin 100–32–33, dated October 31, 2018; 

or Bombardier Service Bulletin 100–32–33, 

Revision 01, July 31, 2019. 

(2) This paragraph provides credit for 

actions required by paragraph (h) of this AD, 

if those actions were performed before the 

effective date of this AD using paragraph 2.B. 

of Bombardier Service Bulletin 350–32–009, 

dated October 31, 2018; or Bombardier 

Service Bulletin 350–32–009, Revision 01 

dated July 31, 2019; provided that the NLG 

shock strut assembly with P/N 44630–101 

was removed in lieu of P/N 44610–101, as 

specified in paragraph 2.B.(1) of the 

Accomplishment Instructions of Bombardier 

Service Bulletin 350–32–009, dated October 

31, 2018; or Bombardier Service Bulletin 

350–32–009, Revision 01 dated July 31, 2019. 

(k) Other FAA AD Provisions 

The following provisions also apply to this 

AD: 

(1) Alternative Methods of Compliance 

(AMOCs): The Manager, New York ACO 

Branch, FAA, has the authority to approve 

AMOCs for this AD, if requested using the 

procedures found in 14 CFR 39.19. In 

accordance with 14 CFR 39.19, send your 

request to your principal inspector or local 

Flight Standards District 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 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, New York ACO Branch, 

FAA; or Transport Canada Civil Aviation 

(TCCA); or Bombardier’s TCCA Design 

Approval Organization (DAO). If approved by 

the DAO, the approval must include the 

DAO-authorized signature. 

(l) Related Information 

(1) Refer to Mandatory Continuing 

Airworthiness Information (MCAI) Canadian 

AD CF–2019–43, dated November 8, 2019, 

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–2020–0458. 

(2) For more information about this AD, 

contact Darren Gassetto, Aerospace Engineer, 

Mechanical Systems and Administrative 

Services Section, FAA, New York ACO 

Branch, 1600 Stewart Avenue, Suite 410, 

Westbury, NY 11590; telephone 516–228– 

7323; fax 516–794–5531; email 9-avs-nyacocos@faa.gov. 

(3) Service information identified in this 

AD that is not incorporated by reference is 

available at the addresses specified in 

paragraphs (m)(3) and (4) of this AD. 

(m) 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 Service Bulletin 100–32–33, 

Revision 02, dated September 30, 2019. 

(ii) Bombardier Service Bulletin 350–32– 

009, Revision 02, dated September 30, 2019. 

(3) For service information identified in 

this AD, contact Bombardier, Inc., 200 CoˆteVertu Road West, Dorval, Que ́bec H4S 2A3, 

Canada; North America toll-free telephone 1– 

866–538–1247 or direct-dial telephone 1– 

514–855–2999; email ac.yul@

aero.bombardier.com; internet http://

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 fedreg.legal@nara.gov, or go to: https:// 

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

Issued on December 1, 2020. 

Gaetano A. Sciortino, 

Deputy Director for Strategic Initiatives, 

Compliance & Airworthiness Division, 

Aircraft Certification Service. 

[FR Doc. 2020–28282 Filed 12–22–20; 8:45 am] 

BILLING CODE 4910–13–P 


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