Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier, Inc.) Airplanes, 20461-20465 [2021-08053]
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Federal Register / Vol. 86, No. 74 / Tuesday, April 20, 2021 / Proposed Rules
2021–0312; Project Identifier MCAI–
2020–01376–T.
(a) Comments Due Date
The FAA must receive comments on this
airworthiness directive (AD) by June 4, 2021.
(b) Affected ADs
None.
(c) Applicability
This AD applies to De Havilland Aircraft
of Canada Limited (type certificate
previously held by Bombardier, Inc.)
airplanes, certificated in any category, and
identified in paragraphs (c)(1) through (4) of
this AD.
(1) Model DHC–8–102, –103, and –106
airplanes, as identified in De Havilland
Service Bulletin 8–27–123, Revision A, dated
September 8, 2020.
(2) Model DHC–8–201 and –202 airplanes,
as identified in De Havilland Service Bulletin
8–27–123, Revision A, dated September 8,
2020.
(3) Model DHC–8–301, –311, and –315
airplanes, as identified in De Havilland
Service Bulletin 8–27–123, Revision A, dated
September 8, 2020.
(4) Model DHC–8–400, –401, and –402
airplanes, as identified in De Havilland
Service Bulletin 84–27–74, Revision B, dated
September 8, 2020.
(d) Subject
Air Transport Association (ATA) of
America Code 27, Flight controls.
(e) Unsafe Condition
This AD was prompted by reports that
mounting nuts attaching the rudder actuator
bracket to the vertical stabilizer have been
found cracked or missing due to hydrogen
embrittlement. The FAA is issuing this AD to
address the possible loss of the rudder
actuator bracket, which could result in a
dormant disconnection between the rudder
actuator and the vertical stabilizer. This
condition, if not addressed, could result in a
loss of directional control of the aircraft.
(f) Compliance
Comply with this AD within the
compliance times specified, unless already
done.
(g) Required Actions
Within 8,000 flight hours or 4 years,
whichever is earlier, after the effective date
of this AD: Do a detailed visual inspection of
the rudder actuator bracket mounting nuts for
missing nuts or corrosion, cracking, or other
damage, in accordance with the
Accomplishment Instructions of De
Havilland Service Bulletin 8–27–123,
Revision A, dated September 8, 2020; or De
Havilland Service Bulletin 84–27–74,
Revision B, dated September 8, 2020; as
applicable. If any missing nuts or corrosion,
cracking, or other damage is found, replace
the nuts before further flight, in accordance
with the Accomplishment Instructions of De
Havilland Service Bulletin 8–27–123,
Revision A, dated September 8, 2020; or De
Havilland Service Bulletin 84–27–74,
Revision B, dated September 8, 2020; as
applicable.
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(h) Credit for Previous Actions
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 De Havilland Service
Bulletin 8–27–123, dated December 20, 2019;
De Havilland Service Bulletin 84–27–74,
dated December 20, 2019; or De Havilland
Service Bulletin 84–27–74, Revision A, dated
January 20, 2020; as applicable.
(i) No Reporting Requirement
Although De Havilland Service Bulletin 8–
27–123, Revision A, dated September 8,
2020; and De Havilland Service Bulletin 84–
27–74, Revision B, dated September 8, 2020,
specify to submit certain information to the
manufacturer, this AD does not include that
requirement.
(j) Other FAA AD Provisions
The following provisions also apply to this
AD:
(1) Alternative Methods of Compliance
(AMOCs): The Manager, 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
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 De Havilland Aircraft of Canada
Limited’s TCCA Design Approval
Organization (DAO). If approved by the DAO,
the approval must include the DAOauthorized signature.
(k) Related Information
(1) Refer to Mandatory Continuing
Airworthiness Information (MCAI) TCCA AD
CF–2020–34, dated October 6, 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–2021–0312.
(2) For more information about this AD,
contact Aziz Ahmed, Aerospace Engineer,
Airframe and Propulsion Section, FAA, New
York ACO Branch, 1600 Stewart Avenue,
Suite 410, Westbury, NY 11590; telephone
516–228–7329; fax 516–794–5531; email 9avs-nyaco-cos@faa.gov.
(3) For service information identified in
this AD, contact De Havilland Aircraft of
Canada Limited, Q-Series Technical Help
Desk, 123 Garratt Boulevard, Toronto,
Ontario M3K 1Y5, Canada; telephone 416–
375–4000; fax 416–375–4539; email thd@
dehavilland.com; internet https://
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20461
dehavilland.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.
Issued on April 13, 2021.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives,
Compliance & Airworthiness Division,
Aircraft Certification Service.
[FR Doc. 2021–07985 Filed 4–19–21; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2021–0309; Project
Identifier MCAI–2020–00918–T]
RIN 2120–AA64
Airworthiness Directives; MHI RJ
Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.)
Airplanes
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
The FAA proposes to adopt 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 proposed
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
proposed AD would 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 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
proposing this AD to address the unsafe
condition on these products.
SUMMARY:
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Federal Register / Vol. 86, No. 74 / Tuesday, April 20, 2021 / Proposed Rules
The FAA must receive comments
on this proposed AD by June 4, 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 Bombardier service information
identified in this NPRM, contact MHI RJ
Aviation ULC, 12655 Henri-Fabre Blvd.,
Mirabel, Que´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.
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.
DATES:
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 NPRM, any
comments received, and other
information. The street address for
Docket Operations is listed above.
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:
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–2021–0309; Project Identifier
MCAI–2020–00918–T’’ at the beginning
of your comments. The most helpful
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comments reference a specific portion of
the proposal, explain the reason for any
recommended change, and include
supporting data. The FAA will consider
all comments received by the closing
date and may amend the proposal
because of those comments.
Except for Confidential Business
Information (CBI) as described in the
following paragraph, and other
information as described in 14 CFR
11.35, the FAA will post all comments
received, without change, to https://
www.regulations.gov, including any
personal information you provide. The
agency will also post a report
summarizing each substantive verbal
contact received about this proposed
AD.
Confidential Business Information
CBI is commercial or financial
information that is both customarily and
actually treated as private by its owner.
Under the Freedom of Information Act
(FOIA) (5 U.S.C. 552), CBI is exempt
from public disclosure. If your
comments responsive to this NPRM
contain commercial or financial
information that is customarily treated
as private, that you actually treat as
private, and that is relevant or
responsive to this NPRM, it is important
that you clearly designate the submitted
comments as CBI. Please mark each
page of your submission containing CBI
as ‘‘PROPIN.’’ The FAA will treat such
marked submissions as confidential
under the FOIA, and they will not be
placed in the public docket of this
NPRM. Submissions containing CBI
should be sent to 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. Any
commentary that the FAA receives
which is not specifically designated as
CBI will be placed in the public docket
for this rulemaking.
Background
Transport Canada Civil Aviation
(TCCA), which is the aviation authority
for Canada, has issued TCCA AD CF–
2019–17R1, dated June 18, 2020
(referred to after this 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
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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.
This proposed AD 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
FAA is proposing 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.
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
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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.
FAA’s bilateral agreement with the State
of Design Authority, the FAA has been
notified of the unsafe condition
described in the MCAI and service
information referenced above. The FAA
is proposing this AD because the FAA
evaluated all the relevant information
and determined the unsafe condition
described previously is likely to exist or
develop on other products of the same
type design.
‘‘Differences Between this Proposed AD
and the MCAI or Service Information.’’
FAA’s Determination
This product has been approved by
the aviation authority of another
country, and is approved for operation
in the United States. Pursuant to the
Proposed Requirements of This NPRM
This proposed AD would require
accomplishing the actions specified in
the service information described
previously, except as discussed under
Costs of Compliance
Differences Between This Proposed 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 proposed AD.
The FAA estimates that this proposed
AD affects 562 airplanes of U.S. registry.
The FAA estimates the following costs
to comply with this proposed AD:
ESTIMATED COSTS FOR REQUIRED ACTIONS
Labor cost
Parts cost
Cost per product
Cost on U.S.
operators
Up to 100 work-hours × $85 per hour = Up to $8,500 ........................................
Up to $36,604 .......
Up to $45,104 .......
Up to $25,348,448.
According to the manufacturer, some
or all of the costs of this proposed 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 our cost estimate.
Authority for This Rulemaking
Title 49 of the United States Code
specifies the FAA’s authority to issue
rules on aviation safety. Subtitle I,
section 106, describes the authority of
the FAA Administrator. Subtitle VII:
Aviation Programs, describes in more
detail the scope of the Agency’s
authority.
The FAA is issuing this rulemaking
under the authority described in
Subtitle VII, Part A, Subpart III, Section
44701: General requirements. Under
that section, Congress charges the FAA
with promoting safe flight of civil
aircraft in air commerce by prescribing
regulations for practices, methods, and
procedures the Administrator finds
necessary for safety in air commerce.
This regulation is within the scope of
that authority because it addresses an
unsafe condition that is likely to exist or
develop on products identified in this
rulemaking action.
Regulatory Findings
The FAA determined that this
proposed AD would not have federalism
implications under Executive Order
13132. This proposed AD would not
have a substantial direct effect on the
States, on the relationship between the
national Government and the States, or
on the distribution of power and
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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
(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.
Accordingly, under the authority
delegated to me by the Administrator,
the FAA proposes to amend 14 CFR part
39 as follows:
(d) Subject
PART 39—AIRWORTHINESS
DIRECTIVES
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.
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:
■
MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.):
Docket No. FAA–2021–0309; Project
Identifier MCAI–2020–00918–T.
(a) Comments Due Date
The FAA must receive comments on this
airworthiness directive (AD) by June 4, 2021.
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Air Transport Association (ATA) of
America Code 32, Landing Gear.
(e) Reason
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(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.
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(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: 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, dated December
21, 2018.
Note 1 to 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.
PO 00000
Frm 00006
Fmt 4702
Sfmt 4702
(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
Instructions of Bombardier Service Bulletin
670BA–32–039, dated February 29, 2012.
(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.
Note 2 to 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.
(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 Aircraft
Maintenance Manual (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.
E:\FR\FM\20APP1.SGM
20APP1
Federal Register / Vol. 86, No. 74 / Tuesday, April 20, 2021 / Proposed Rules
(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 Aircraft
Maintenance Manual (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.
VerDate Sep<11>2014
16:17 Apr 19, 2021
Jkt 253001
(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) For Bombardier service information
identified in this AD, contact MHI RJ
Aviation ULC, 12655 Henri-Fabre Blvd.,
Mirabel, Que´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. 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.
Issued on April 13, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2021–08053 Filed 4–19–21; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
20465
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.
• 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 GE Aviation Czech,
Beranovy´ch 65 199 02 Praha 9—
Letnˇany, Czech Republic; phone: +420
222 538 111. You may view this service
information at the FAA, Airworthiness
Products Section, Operational Safety
Branch, 1200 District Avenue,
Burlington, MA 01803. For information
on the availability of this material at the
FAA, call (781) 238–7759.
ADDRESSES:
14 CFR Part 39
Examining the AD Docket
[Docket No. FAA–2021–0316; Project
Identifier MCAI–2020–00461–E]
You may examine the AD docket at
https://www.regulations.gov by
searching for and locating Docket No.
FAA–2021–0316; or in person at Docket
Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal
holidays. The AD docket contains this
NPRM, the mandatory continuing
airworthiness information (MCAI), any
comments received, and other
information. The street address for
Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT:
Barbara Caufield, Aviation Safety
Engineer, ECO Branch, FAA, 1200
District Avenue, Burlington, MA 01803;
phone: (781) 238–7146; fax: (781) 238–
7199; email: barbara.caufield@faa.gov.
SUPPLEMENTARY INFORMATION:
RIN 2120–AA64
Airworthiness Directives; GE Aviation
Czech s.r.o. (Type Certificate
Previously Held by WALTER Engines
a.s., Walter a.s., and MOTORLET a.s.)
Turboprop Engines
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
The FAA proposes to adopt a
new airworthiness directive (AD) for all
GE Aviation Czech s.r.o. (GEAC) H75–
200, H80–100, and H80–200 model
turboprop engines. This proposed AD
was prompted by several reports of
engine gas generator speed (Ng)
rollbacks occurring below idle on GEAC
H75–200, H80–100, and H80–200 model
turboprop engines. This proposed AD
would require an inspection of a certain
part number (P/N) fuel control unit
(FCU) and, if deficiencies are detected,
replacement of the FCU with a part
eligible for installation. 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 June 4, 2021.
SUMMARY:
PO 00000
Frm 00007
Fmt 4702
Sfmt 4702
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–2021–0316; Project Identifier
MCAI–2020–00461–E’’ 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
E:\FR\FM\20APP1.SGM
20APP1
]]>Agencies
[Federal Register Volume 86, Number 74 (Tuesday, April 20, 2021)]
[Proposed Rules]
[Pages 20461-20465]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-08053]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0309; Project Identifier MCAI-2020-00918-T]
RIN 2120-AA64
Airworthiness Directives; MHI RJ Aviation ULC (Type Certificate
Previously Held by Bombardier, Inc.) 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 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 proposed 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 proposed AD would 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
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 proposing this AD to address the
unsafe condition on these products.
[[Page 20462]]
DATES: The FAA must receive comments on this proposed AD by June 4,
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 Bombardier service information identified in this NPRM, 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 [email protected]; 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.
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 NPRM, any comments received, and other information. The street
address for Docket Operations is listed above.
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 [email protected].
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-2021-0309; Project Identifier
MCAI-2020-00918-T'' at the beginning of your comments. The most helpful
comments reference a specific portion of the proposal, explain the
reason for any recommended change, and include supporting data. The FAA
will consider all comments received by the closing date and may amend
the proposal because of those comments.
Except for Confidential Business Information (CBI) as described in
the following paragraph, and other information as described in 14 CFR
11.35, the FAA will post all comments received, without change, to
https://www.regulations.gov, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this proposed AD.
Confidential Business Information
CBI is commercial or financial information that is both customarily
and actually treated as private by its owner. Under the Freedom of
Information Act (FOIA) (5 U.S.C. 552), CBI is exempt from public
disclosure. If your comments responsive to this NPRM contain commercial
or financial information that is customarily treated as private, that
you actually treat as private, and that is relevant or responsive to
this NPRM, it is important that you clearly designate the submitted
comments as CBI. Please mark each page of your submission containing
CBI as ``PROPIN.'' The FAA will treat such marked submissions as
confidential under the FOIA, and they will not be placed in the public
docket of this NPRM. Submissions containing CBI should be sent to
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 [email protected]. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in
the public docket for this rulemaking.
Background
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued TCCA AD CF-2019-17R1, dated June 18,
2020 (referred to after this 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.
This proposed AD 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 FAA is proposing
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.
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
[[Page 20463]]
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.
FAA's Determination
This product has been approved by the aviation authority of another
country, and is approved for operation in the United States. Pursuant
to the FAA's bilateral agreement with the State of Design Authority,
the FAA has been notified of the unsafe condition described in the MCAI
and service information referenced above. The FAA is proposing this AD
because the FAA evaluated all the relevant information and determined
the unsafe condition described previously is likely to exist or develop
on other products of the same type design.
Proposed Requirements of This NPRM
This proposed AD would require accomplishing the actions specified
in the service information described previously, except as discussed
under ``Differences Between this Proposed AD and the MCAI or Service
Information.''
Differences Between This Proposed 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 proposed AD.
Costs of Compliance
The FAA estimates that this proposed AD affects 562 airplanes of
U.S. registry. The FAA estimates the following costs to comply with
this proposed AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 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
proposed 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 our cost estimate.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII: Aviation Programs,
describes in more detail the scope of the Agency's authority.
The FAA is issuing this rulemaking under the authority described in
Subtitle VII, Part A, Subpart III, Section 44701: General requirements.
Under that section, Congress charges the FAA with promoting safe flight
of civil aircraft in air commerce by prescribing regulations for
practices, methods, and procedures the Administrator finds necessary
for safety in air commerce. This regulation is within the scope of that
authority because it addresses an unsafe condition that is likely to
exist or develop on products identified in this rulemaking action.
Regulatory Findings
The FAA determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD would not
have a substantial direct effect on the States, on the relationship
between the national Government and the States, or on the distribution
of power and responsibilities among the various levels of government.
For the reasons discussed above, I certify this proposed
regulation:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866,
(2) Would not affect intrastate aviation in Alaska, and
(3) Would not have a significant economic impact, positive or
negative, on a substantial number of small entities under the criteria
of the Regulatory Flexibility Act.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
The Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
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:
MHI RJ Aviation ULC (Type Certificate Previously Held by Bombardier,
Inc.): Docket No. FAA-2021-0309; Project Identifier MCAI-2020-00918-
T.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by June 4, 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.
[[Page 20464]]
(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: 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, dated December
21, 2018.
Note 1 to 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 Instructions of Bombardier Service Bulletin 670BA-32-
039, dated February 29, 2012.
(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.
Note 2 to 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.
(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 Aircraft Maintenance Manual (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.
[[Page 20465]]
(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 Aircraft Maintenance Manual
(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
[email protected].
(3) For Bombardier 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
[email protected]; 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.
Issued on April 13, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2021-08053 Filed 4-19-21; 8:45 am]
BILLING CODE 4910-13-P
