Document ID: FAA-2021-0309-0005
Agency: faa
Document Type: Rule
Title: Airworthiness Directives: MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes
Posted Date: 2021-10-06T04:00Z

[Federal Register Volume 86, Number 191 (Wednesday, October 6, 2021)]
[Rules and Regulations]
[Pages 55479-55483]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-21830]

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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2021-0309; Project Identifier MCAI-2020-00918-T; 
Amendment 39-21730; AD 2021-19-12]
RIN 2120-AA64

Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate 
Previously Held by Bombardier, Inc.) Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: The FAA is adopting a new airworthiness directive (AD) for MHI 
RJ Aviation ULC Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), 
CL-600-2C11 (Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 
705), CL-600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional 
Jet Series 1000) airplanes. This AD was prompted by reports and a 
design review indicating that there could be possible corrosion on the 
main landing gear (MLG) outer cylinder at the interface with the gland 
nut on the shock strut installation and on the forward and aft trunnion 
pins in the MLG dressed shock strut assembly. This AD requires detailed 
inspections for corrosion on the MLG outer cylinder assemblies, certain 
MLG dressed shock strut assemblies, and the MLG outer cylinder at the 
gland nut threads, thread relief groove, and chamfer; a detailed 
inspection for the presence of corrosion-inhibiting compound (CIC) on 
the MLG forward and aft trunnion pins and grease adapter assemblies; 
applicable corrective actions; application of primer, paint, and CIC as 
applicable; re-identification of certain part numbers; and marking of 
the MOD STATUS field of the nameplate of certain parts. The FAA is 
issuing this AD to address the unsafe condition on these products.

DATES: This AD is effective November 10, 2021.
    The Director of the Federal Register approved the incorporation by 
reference of certain publications listed in this AD as of November 10, 
2021

ADDRESSES: For service information identified in this final rule, 
contact MHI RJ Aviation ULC, 12655 Henri-Fabre Blvd., Mirabel, 
Qu[eacute]bec J7N 1E1 Canada; Widebody Customer Response Center North 
America toll-free telephone +1-844-272-2720 or direct-dial telephone 
+1-514-855-8500; fax +1-514-855-

[[Page 55480]]

8501; email thd.crj@mhirj.com; internet https://eservices.aero.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-
0309.

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-
0309; 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:

Background

    Transport Canada Civil Aviation (TCCA), which is the aviation 
authority for Canada, has issued TCCA AD CF-2019-17R1, dated June 18, 
2020 (TCCA AD CF-2019-17R1, dated June 18, 2020) (also referred to as 
the Mandatory Continuing Airworthiness Information, or the MCAI), to 
correct an unsafe condition for MHI RJ Aviation ULC (type certificate 
previously held by Bombardier, Inc.) Model CL-600-2C10 (Regional Jet 
Series 700, 701 & 702) airplanes, Model CL-600-2C11 (Regional Jet 
Series 550) airplanes, Model CL-600-2D15 (Regional Jet Series 705) 
airplanes, CL-600-2D24 (Regional Jet Series 900) airplanes, and Model 
CL-600-2E25 (Regional Jet Series 1000) 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-2021-0309.
    The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 
CFR part 39 by adding an AD that would apply to MHI RJ Aviation ULC 
Model CL-600-2C10 (Regional Jet Series 700, 701 & 702), CL-600-2C11 
(Regional Jet Series 550), CL-600-2D15 (Regional Jet Series 705), CL-
600-2D24 (Regional Jet Series 900), and CL-600-2E25 (Regional Jet 
Series 1000) airplanes. The NPRM published in the Federal Register on 
April 20, 2021 (86 FR 20461). The NPRM was prompted by reports and a 
design review indicating that there could be corrosion on the MLG outer 
cylinder assemblies and certain MLG dressed shock strut assemblies; 
primer was not correctly applied at the gland nut thread relief groove 
and chamfer areas on certain MLG outer cylinders during production; and 
CIC was inadvertently removed from certain MLG forward and aft trunnion 
pins and grease adapter assemblies during maintenance. The NPRM 
proposed to require detailed inspections for corrosion on the MLG outer 
cylinder assemblies, certain MLG dressed shock strut assemblies, and 
the MLG outer cylinder at the gland nut threads, thread relief groove, 
and chamfer; a detailed inspection for the presence of CIC on the MLG 
forward and aft trunnion pins and grease adapter assemblies; applicable 
corrective actions; application of primer, paint, and CIC as 
applicable; re-identification of certain part numbers; and marking of 
the MOD STATUS field of the nameplate of certain parts. The FAA is 
issuing this AD to address undetected corrosion on the MLG forward and 
aft trunnion pins, and the gland nut interface on certain MLG outer 
cylinders, which could result in an MLG collapse. 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 comments 
received on the NPRM and the FAA's response to each comment.

Support for the NPRM

    Air Line Pilots Association, International (ALPA) stated that it 
supports the NPRM.

Request to Separate the Proposed AD Into Two Separate AD Actions

    SkyWest Airlines (SkyWest) requested that the proposed AD be 
separated into two AD actions. The commenter recommended that one AD 
address the MLG outer cylinder assemblies and dressed shock strut 
assemblies and the other AD address the MLG forward and aft trunnion 
pins. The commenter stated that there are multiple service bulletins 
and requirements specified in the proposed AD that are related to 
different MLG components.
    The FAA disagrees with the commenter's request. The FAA 
acknowledges that this AD includes requirements for different MLG 
components and specifies multiple service bulletins; however, these MLG 
components are interrelated. In order to address the identified unsafe 
condition the requirements must be completed at the same time. In 
addition, the AD body is organized to facilitate an owner/operator's 
compliance with the requirements of this AD. Each header for paragraphs 
(g) through (k) of this AD identifies the affected MLG component and 
the applicable actions. The FAA has not changed this AD in regard to 
this issue.

Request To Allow Credit for Vendor Service Bulletins

    SkyWest requested that paragraph (l) of the proposed AD, Credit for 
Previous Actions, be revised to include the applicable vendor service 
bulletins published by Goodrich. The commenter stated that this would 
alleviate the need to request multiple alternative methods of 
compliance (AMOCs) for airplanes on which the MLG gear is returned from 
overhaul with only the actions described in the Goodrich service 
bulletins accomplished rather that the actions described in the 
corresponding Bombardier service bulletins. The commenter noted that 
each Bombardier service bulletin specified in paragraph (l) of the 
proposed AD refers to a corresponding Goodrich service bulletin.
    The FAA agrees to clarify what must be done if certain actions 
required by this AD have already been accomplished. Paragraph (f) of 
this AD states ``Comply with this AD within the compliance times 
specified, unless already done.'' If an operator has already 
accomplished some of the actions required by this AD then only the 
remaining actions need to be completed. Therefore, for airplanes that 
have already incorporated the actions described in UTC Aerospace 
Systems (Goodrich Aerospace Canada Ltd) Service Bulletin 49101-32-72, 
Goodrich Service Bulletin 49200-32-44, or Goodrich Service Bulletin 
49200-32-80 prior to the effective date of this AD, only the remaining 
requirements described in the corresponding Bombardier service 
bulletins need to be completed on those airplanes.
    The FAA does not agree with granting complete credit for the 
actions required by paragraphs (g), (i), and (j) of this AD using only 
the procedures described in the applicable Goodrich service

[[Page 55481]]

bulletins. There are additional actions required for these inspections, 
including corrective actions and operational tests, that are included 
in the Bombardier service bulletins but not in the corresponding 
Goodrich service bulletins.
    In regards to paragraph (l) in this AD, Credit for Previous 
Actions, the intent of that paragraph is to provide credit for actions 
required by paragraphs (g), (h), and (j) of this AD if those actions 
were performed before the effective date of this AD using the certain 
earlier revisions of the applicable Bombardier service bulletins 
specified in paragraph (l) of this AD or equivalent service 
information. The FAA has not changed this AD in regard to this issue.

Conclusion

    The FAA reviewed the relevant data, considered the comments 
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 the following service information.
     Service Bulletin 670BA-32-024, Revision C, dated February 
11, 2015, which describes procedures for a detailed visual inspection 
of the MLG outer cylinder assemblies and dressed shock strut assemblies 
for corrosion of the outer cylinder gland nut thread interface and 
relief area, and corrective actions including repair and corrosion 
removal.
     Service Bulletin 670BA-32-034, Revision B, dated December 
21, 2018, which describes procedures for a detailed visual inspection 
of the inside diameter of the MLG trunnion pins for discrepancies 
including the condition of paint and CIC and evidence of corrosion, and 
corrective actions including replacement and rework of the trunnion 
pins as applicable.
     Service Bulletin 670BA-32-039, dated February 29, 2012, 
which describes procedures for inspections of the inner diameter of the 
MLG forward and aft trunnion pins for discrepancies including corrosion 
and inadequate CIC, and corrective actions including application of CIC 
and replacement of corroded forward and aft trunnion pins with 
serviceable parts.
     Service Bulletin 670BA-32-052, dated February 9, 2015, 
which describes procedures for a detailed visual inspection of the 
gland nut thread relief groove and chamfer surface for the condition of 
the protective coating and for discrepancies including evidence of 
corrosion or rework at the gland nut thread relief groove and chamfer 
surface of the MLG shock strut outer cylinder assemblies, and 
corrective actions including corrosion removal.
    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.

Differences Between This AD and the MCAI or Service Information

    Although certain service information specifies to return damaged 
MLG trunnion pins to Goodrich Landing Gear, that action would not be 
required by this AD.

Costs of Compliance

    The FAA estimates that this AD affects 562 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 100 work-hours x $85 per hour =  Up to $36,604..........  Up to $45,104..........  Up to $25,348,448.
 Up to $8,500.
----------------------------------------------------------------------------------------------------------------

    According to the manufacturer, some or all of the costs of this AD 
may be covered under warranty, thereby 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

    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

0
1. The authority citation for part 39 continues to read as follows:

    Authority:  49 U.S.C. 106(g), 40113, 44701.

Sec.  39.13  [Amended]

0
2. The FAA amends Sec.  39.13 by adding the following new airworthiness 
directive:

[[Page 55482]]

2021-19-12 MHI RJ Aviation ULC (Type Certificate Previously Held by 
Bombardier, Inc.): Amendment 39-21730; Docket No. FAA-2021-0309; 
Project Identifier MCAI-2020-00918-T.

(a) Effective Date

    This airworthiness directive (AD) is effective November 10, 
2021.

(b) Affected ADs

    None.

(c) Applicability

    This AD applies to the MHI RJ Aviation ULC (type certificate 
previously held by Bombardier, Inc.) airplanes, certificated in any 
category, specified in paragraphs (c)(1) through (3) of this AD.
    (1) Model CL-600-2C10 (Regional Jet Series 700, 701 & 702) and 
Model CL-600-2C11 (Regional Jet Series 550) airplanes, serial 
numbers 10002 and subsequent.
    (2) Model CL-600-2D15 (Regional Jet Series 705) airplanes and 
CL-600-2D24 (Regional Jet Series 900) airplanes, serial numbers 
15001 and subsequent.
    (3) Model CL-600-2E25 (Regional Jet Series 1000) airplanes, 
serial numbers 19001 and subsequent.

(d) Subject

    Air Transport Association (ATA) of America Code 32, Landing 
Gear.

(e) Reason

    This AD was prompted by reports and a design review indicating 
that there could be corrosion on the main landing gear (MLG) outer 
cylinder assemblies at the interface with the gland nut on the shock 
strut installation and on the forward and aft trunnion pins in the 
MLG dressed shock strut assemblies; primer was not correctly applied 
at the gland nut thread relief groove and chamfer areas on certain 
MLG outer cylinders during production; and corrosion-inhibiting 
compound (CIC) could have inadvertently been removed from certain 
MLG forward and aft trunnion pins and grease adapter assemblies 
during maintenance. The FAA is issuing this AD to address undetected 
corrosion on the MLG forward and aft trunnion pins, and the gland 
nut interface on certain MLG outer cylinders, which could result in 
an MLG collapse.

(f) Compliance

    Comply with this AD within the compliance times specified, 
unless already done.

(g) Inspection and Application of Corrosion Protection for MLG Outer 
Cylinder Assemblies and Certain MLG Dressed Shock Strut Assemblies

    For airplanes identified in paragraphs (c)(1) and (2) of this AD 
with MLG outer cylinder assemblies and MLG dressed shock strut 
assemblies having part numbers and serial numbers specified in the 
effectivity tables in Section 1.A.(1) of Bombardier Service Bulletin 
670BA-32-024, Revision C, dated February 11, 2015 (Bombardier 
Service Bulletin 670BA-32-024, Revision C): At the applicable time 
specified in paragraph (g)(1) or (2) of this AD, do a detailed 
visual inspection for corrosion, and all other required actions 
specified in, and in accordance with, Section 2., Part A, of the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-
024, Revision C.
    (1) For MLG assemblies that have accumulated 12,500 total flight 
hours or less, and have been in service for 72 months or less from 
entry into service or the last overhaul date: Within 6,500 flight 
hours or 36 months, whichever comes first, after the effective date 
of this AD.
    (2) For MLG assemblies that have accumulated more than 12,500 
total flight hours, or have been in service for more than 72 months 
from entry into service or the last overhaul date: Within 3,500 
flight hours or 24 months, whichever occurs first, after the 
effective date of this AD.

(h) Inspection of Certain Other MLG Dressed Shock Strut Assemblies and 
Corrective Action

    For airplanes identified in paragraphs (c)(1) and (2) of this 
AD, equipped with MLG dressed shock strut assemblies having part 
numbers (P/Ns) 49000-25 through 49000-46 and P/Ns 49050-15 through 
49050-22, on which the MLG active dynamic seal has been replaced 
with the spare dynamic seal as specified in Bombardier CRJ700/705/
900/1000 Aircraft Maintenance Manual (AMM), CSP B-001, Task 32-11-
10-960-802, Revision 37, dated November 25, 2011, or earlier: At the 
applicable time specified in paragraph (h)(1) or (2) of this AD, do 
a detailed visual inspection of the MLG dressed shock strut 
assemblies for corrosion, and all applicable corrective actions, in 
accordance with Section 2., Part B, of the Accomplishment 
Instructions of Bombardier Service Bulletin 670BA-32-024, Revision 
C.
    (1) For MLG assemblies that have accumulated 12,500 total flight 
hours or less, and have been in service for 72 months or less from 
entry into service or the last overhaul date: Within 6,500 flight 
hours or 36 months, whichever comes first, after the effective date 
of this AD.
    (2) For MLG assemblies that have accumulated more than 12,500 
total flight hours, or have been in service for more than 72 months 
from entry into service or the last overhaul date: Within 3,500 
flight hours or 24 months, whichever occurs first, after the 
effective date of this AD.

(i) Inspection of MLG Outer Cylinder at the Gland Nut Threads, Thread 
Relief Groove, and Chamfer and Corrective Action

    For airplanes identified in paragraphs (c)(1) through (3) of 
this AD equipped with MLG outer cylinder assemblies having part 
numbers and serial numbers specified in Section 1.A., Effectivity, 
of Bombardier Service Bulletin 670BA-32-052, dated February 9, 2015: 
Within 6,500 flight hours or 36 months, whichever occurs first after 
the effective date of this AD, do a detailed visual inspection of 
the MLG shock strut outer cylinder assemblies, and do all other 
required actions specified in, and in accordance with, Section 2. of 
the Accomplishment Instructions of Bombardier Service Bulletin 
670BA-32-052, dated February 9, 2015.

(j) Inspection of Certain MLG Forward and Aft Trunnion Pins, and 
Corrective Action

    For airplanes identified in paragraphs (c)(1) through (3) of 
this AD equipped with MLG forward and aft trunnion pins and grease 
adapter assemblies having part numbers and serial numbers specified 
in Section 1.A., Effectivity, of Bombardier Service Bulletin 670BA-
32-034, Revision B, dated December 21, 2018 (Bombardier Service 
Bulletin 670BA-32-034, Revision B): At the applicable time specified 
in paragraph (j)(1) or (2) of this AD, do a detailed visual 
inspection of the MLG forward and aft trunnion pins and do all 
applicable corrective actions, in accordance with Section 2.B. and 
paragraphs 2.C.(6) and (8) of the Accomplishment Instructions of 
Bombardier Service Bulletin 670BA-32-034, Revision B.
    Note 1 to the introductory text of paragraph (j): The corrective 
action is applicable only to MLG forward and aft trunnion pins 
having P/Ns 49101-9, -11, and -13 reworked from P/Ns 49101-1, -5, 
and -7, as specified in the procedures in Goodrich Service Bulletin 
49101-32-47, any revision. The corrective action is not applicable 
to MLG forward and aft trunnion pins having P/Ns 49101-9, -11, and -
13 that were installed as original equipment or purchased from 
Goodrich Landing Gear.
    (1) For MLG forward and aft trunnion pins and grease adapter 
assemblies that have not had the procedures specified in Goodrich 
Service Bulletin 49101-32-47, any revision, incorporated, at the 
applicable time specified in paragraph (j)(1)(i) or (ii) of this AD.
    (i) For MLG forward and aft trunnion pins that have accumulated 
10,000 total flight hours or less, and have been in service 60 
months or less from the entry into service or last overhaul date: 
Within 6,500 flight hours or 36 months, whichever occurs first, 
after the effective date of this AD.
    (ii) For MLG forward and aft trunnion pins that have accumulated 
more than 10,000 total flight hours, or have been in service for 
more than 60 months from entry into service or last overhaul date: 
Within 3,000 flight hours or 24 months, whichever occurs first, 
after the effective date of this AD.
    (2) For MLG forward and aft trunnion pins that have had the 
procedures specified in Goodrich Service Bulletin 49101-32-47, any 
revision, incorporated: Within 6,500 flight hours or 36 months, 
whichever occurs first, after the effective date of this AD.

(k) Inspection of Certain Other MLG Trunnion Pins Having P/Ns 49101-9, 
49101-11, and 49101-13, Maintained Using Certain Maintenance 
Instructions

    For airplanes identified in paragraphs (c)(1) through (3) of 
this AD equipped with MLG forward and aft trunnion pins having P/Ns 
49101-9, 49101-11, and 49101-13 that were maintained in accordance 
with the tasks identified in paragraphs (k)(1) through (4) of this 
AD: Within 6,500 flight hours or 36 months after the effective date 
of this AD, whichever occurs first, do a detailed visual inspection 
of the MLG forward and aft trunnion pins, and do all applicable 
corrective actions, in accordance with Section 2. of the 
Accomplishment

[[Page 55483]]

Instructions of Bombardier Service Bulletin 670BA-32-039, dated 
February 29, 2012.
    Note 2 to the introductory text of paragraph (k): The corrective 
action described in this paragraph is not applicable to MLG forward 
and aft trunnion pins having P/Ns 49101-9, -11, and -13 reworked 
from P/Ns 49101-1, -5, and -7 as specified in the procedures in 
Goodrich SB 49101-32-47, any revision. The corrective action 
described in this paragraph is applicable to MLG forward and aft 
trunnion pins having P/Ns 49101-9, -11, and -13 installed as 
original equipment or purchased from Goodrich Landing Gear.
    (1) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-
05-400-801 A01, Revision 31, dated March 20, 2010, or earlier.
    (2) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-
05-400-801 A02, Revision 34, dated November 20, 2010, or earlier.
    (3) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-
05-400-804 A01, Revision 35, dated March 20, 2011, or earlier.
    (4) Bombardier CRJ700/705/900/1000 AMM, CSP B-001, Task 32-11-
05-400-805 A01, Revision 35, dated March 20, 2011, or earlier.

(l) 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 Section 2., Part A, of the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-
024, Revision B, dated December 19, 2012.
    (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 Section 2., Part B, of the 
Accomplishment Instructions of Bombardier Service Bulletin 670BA-32-
024, Revision B, dated December 19, 2012; or Bombardier CRJ700/705/
900/1000 AMM, CSP B-001, Task 32-11-10-960-802, Revision 38, dated 
March 25, 2012.
    (3) This paragraph provides credit for actions required by 
paragraph (j) of this AD if those actions were performed before the 
effective date of this AD using Section 2.B. and paragraphs 2.C.(6) 
and (8) of the Accomplishment Instructions of Bombardier Service 
Bulletin 670BA-32-034, dated February 29, 2012; or Revision A, dated 
August 17, 2012.
    (4) This paragraph provides credit for actions required by 
paragraph (k) of this AD, if those actions were performed before the 
effective date of this AD using the service information specified in 
paragraphs (l)(4)(i) through (iv) of this AD.
    (i) Bombardier CRJ700/900/1000 AMM, CSP B-001, Task 32-11-05-
400-801 A01, Revision 38, dated March 25, 2012.
    (ii) Bombardier CRJ700/900/1000 AMM, CSP B-001, Task 32-11-05-
400-801 A02, Revision 38, dated March 25, 2012.
    (iii) Bombardier CRJ700/900/1000 AMM, CSP B-001, Task 32-11-05-
400-804 A01, Revision 37, dated November 25, 2011, for actions 
specified in Section 2.B.(1) of the Accomplishment Instructions of 
Bombardier Service Bulletin 670BA-32-039, dated February 29, 2012.
    (iv) Bombardier CRJ700/900/1000 AMM, CSP B-001, Task 32-11-05-
400-805 A01, Revision 37, dated November 25, 2011, for actions 
specified in Section 2.B.(2) of the Accomplishment Instructions of 
Bombardier Service Bulletin 670BA-32-039, dated February 29, 2012.

(m) No Requirement for Return of Parts

    Although certain service information referenced in this AD 
specifies to return damaged MLG trunnion pins to Goodrich Landing 
Gear, this AD does not include that requirement.

(n) 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 MHI RJ 
Aviation ULC's TCCA Design Approval Organization (DAO). If approved 
by the DAO, the approval must include the DAO-authorized signature.

(o) Related Information

    (1) Refer to Mandatory Continuing Airworthiness Information 
(MCAI) TCCA AD CF-2019-17R1, dated June 18, 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-2021-0309.
    (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-nyaco-cos@faa.gov.

(p) 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 670BA-32-024, Revision C, dated 
February 11, 2015.
    (ii) Bombardier Service Bulletin 670BA-32-034, Revision B, dated 
December 21, 2018.
    (iii) Bombardier Service Bulletin 670BA-32-039, dated February 
29, 2012.
    (iv) Bombardier Service Bulletin 670BA-32-052, dated February 9, 
2015.
    (3) For service information identified in this AD, contact MHI 
RJ Aviation ULC, 12655 Henri-Fabre Blvd., Mirabel, Qu[eacute]bec J7N 
1E1 Canada; Widebody Customer Response Center North America toll-
free telephone +1-844-272-2720 or direct-dial telephone +1-514-855-
8500; fax +1-514-855-8501; email thd.crj@mhirj.com; internet https://eservices.aero.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: https://www.archives.gov/federal-register/cfr/ibr-locations.html.

    Issued on September 30, 2021.
Ross Landes,
Deputy Director for Regulatory Operations, Compliance & Airworthiness 
Division, Aircraft Certification Service.
[FR Doc. 2021-21830 Filed 10-5-21; 8:45 am]
BILLING CODE 4910-13-P