AD 2020-25-06
final rule
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bombardier Inc. | BD-100-1A10 (Challenger 300) | Airworthiness Directives; Bombardier, Inc., Airplanes |
Unsafe Condition
corrosion was found on the shock strut cylinders during unscheduled maintenance of the nose landing gear (NLG)
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
a modification of the NLG shock strut cylinder, comply with this AD within the compliance times specified, unless already done
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 96 months of the date of issuance of the original standard airworthiness certificate or the date of issuance of the original export certificate of airworthiness, or within 7,500 flight cycles after the effective date of this AD, whichever occurs first
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bombardier, Inc., Model BD-100-1A10 airplanes, serial numbers 200
AI-generated summary from the source AD text. Verify against the official source before acting.
Federal Register Abstract
The FAA is adopting a new airworthiness directive (AD) for certain Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was prompted by a report that corrosion was found on the shock strut cylinders during unscheduled maintenance of the nose landing gear (NLG). This AD requires a modification of the NLG shock strut cylinder. The FAA is issuing this AD to address the unsafe condition on these products.
Applicability Source Text
Show captured applicability text from the source AD
(c) Applicability
This AD applies to Bombardier, Inc., Model BD-100-1A10
airplanes, certificated in any category, serial numbers (S/Ns) 20003
through 20767 inclusive.
Document Text
Show stored source text (verify against official source)
[Federal Register Volume 85, Number 247 (Wednesday, December 23, 2020)]
[Rules and Regulations]
[Pages 83759-83761]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2020-28282]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2020-0458; Product Identifier 2020-NM-029-AD; Amendment
39-21348; AD 2020-25-06]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc., Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Bombardier, Inc., Model BD-100-1A10 airplanes. This AD was
prompted by a report that corrosion was found on the shock strut
cylinders during unscheduled maintenance of the nose landing gear
(NLG). This AD requires a modification of the NLG shock strut cylinder.
The FAA is issuing this AD to address the unsafe condition on these
products.
DATES: This AD is effective January 27, 2021.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of January 27,
2021.
ADDRESSES: For service information identified in this final rule,
contact Bombardier, Inc., 200 C[ocirc]te-Vertu Road West, Dorval,
Qu[eacute]bec H4S 2A3, Canada; North America toll-free telephone 1-866-
538-1247 or direct-dial telephone 1-514-855-2999; email
<a href="/cdn-cgi/l/email-protection#5435377a2d2138143531263b7a363b39363526303d31267a373b39"><span class="__cf_email__" data-cfemail="92f3f1bcebe7fed2f3f7e0fdbcf0fdfff0f3e0f6fbf7e0bcf1fdff">[email protected]</span></a>; internet <a href="http://www.bombardier.com">http://www.bombardier.com</a>. 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 <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No. FAA-2020-
0458.
Examining the AD Docket
You may examine the AD docket on the internet at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No. FAA-2020-
0458; or in person at Docket Operations between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays. The AD docket contains
this final rule, any comments received, and other information. The
address for Docket Operations is U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200
New Jersey Avenue SE, Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Darren Gassetto, Aerospace Engineer,
Mechanical Systems and Administrative Services Section, FAA, New York
ACO Branch, 1600 Stewart Avenue, Suite 410, Westbury, NY 11590;
telephone 516-228-7323; fax 516-794-5531; email <a href="/cdn-cgi/l/email-protection#d2ebffb3a4a1ffbcabb3b1bdffb1bda192b4b3b3fcb5bda4"><span class="__cf_email__" data-cfemail="41786c2037326c2f3820222e6c222e32012720206f262e37">[email protected]</span></a>.
SUPPLEMENTARY INFORMATION:
Discussion
Transport Canada Civil Aviation (TCCA), which is the aviation
authority for Canada, has issued Canadian AD CF-2019-43, dated November
8, 2019 (``AD CF-2019-43'') (also referred to as the Mandatory
Continuing Airworthiness Information, or ``the MCAI''), to correct an
unsafe condition for certain Bombardier, Inc., Model BD-100-1A10
airplanes. You may examine the MCAI in the AD docket on the internet at
<a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket No.
FAA-2020-0458.
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 by adding an AD that would apply to certain Bombardier,
Inc., Model BD-100-1A10 airplanes. The NPRM published in the Federal
Register on June 3, 2020 (85 FR 34141). The NPRM was prompted by a
report that corrosion was found on the shock strut cylinders during
unscheduled maintenance of the NLG. The NPRM proposed to require a
modification of the NLG shock strut cylinder. The FAA is issuing this
AD to address corrosion of the NLG, which could result in structural
failure of the NLG. See the MCAI for additional background information.
Comments
The FAA gave the public the opportunity to participate in
developing this final rule. The following presents the comment received
on the NPRM and the FAA's response to that comment.
Request To Revise Certain Compliance Language in the Proposed AD
Flexjet stated that where the compliance section of Bombardier
Service Bulletin 100-32-33, Revision 02, dated September 30, 2019, and
Figure 1 to paragraph (g) of the proposed AD, specify the compliance
time for NLG assemblies with more than 96 months time since new (TSN),
the compliance time does not take into account that the NLG cylinders
with part number (P/N) 40640-3 and P/N 40640-5 serialized (next higher
assembly P/N 40640-105 and subcomponents) are life-limited items with a
7,500 flight cycle discard interval. Flexjet commented that during the
first 96 month inspection, if the operator has high flight cycles, it
may elect to replace the cylinder at that time. Flexjet also commented
that the compliance section of Bombardier Service Bulletin 100-32-33,
Revision 02, dated September 30, 2019, does not take into account that
a new cylinder could be installed at the 96-month inspection and it
also does not address if the cylinder was replaced for another reason
after the 96-month inspection.
Flexjet stated that the proposed AD needs to be specific on
applying to the nose gear cylinder and sleeve part numbers and not the
nose gear or nose gear strut assembly part numbers. Flexjet also stated
that the nose gear cylinder and sleeve are the parts with corrosion and
the primary reason for the service information. Flexjet pointed out
that the sleeve is cut off for inspection of the cylinder and the same
part number sleeve goes back on following the inspection. The FAA
infers that Flexjet was requesting that the language in paragraphs
(g)(1) and (2) of this AD specify that the actions apply to airplanes
with NLG assemblies having NLG cylinder assemblies and sleeves with
certain part numbers.
The FAA disagrees with the comment. While NLG cylinder assemblies
and their subcomponents can be replaced before or after the 96-month
interval inspection, paragraphs 2.B. and 2.C. of the Accomplishment
Instructions of Bombardier Service Bulletin 100-32-33, Revision 02,
dated September 30, 2019, ensure the proper corrective actions are
taken to prevent corrosion with those replaced components when
reassembled on the NLG assembly. This is why the identification on the
NLG assembly modplate is required. In addition, paragraph (f) of this
AD specifies to, ``Comply with this AD within the compliance times
specified, unless already done.'' Therefore, if some of the specified
corrective actions are already
[[Page 83760]]
complied with, only the remaining corrective actions in the AD need to
be completed to comply with this AD. The FAA has not changed this AD in
this regard.
Conclusion
The FAA reviewed the relevant data, considered the comment
received, and determined that air safety and the public interest
require adopting this final rule as proposed, except for minor
editorial changes. The FAA has determined that these minor changes:
<bullet> Are consistent with the intent that was proposed in the
NPRM for addressing the unsafe condition; and
<bullet> Do not add any additional burden upon the public than was
already proposed in the NPRM.
Related Service Information Under 1 CFR Part 51
Bombardier has issued Service Bulletin 100-32-33, Revision 02,
dated September 30, 2019; and Service Bulletin 350-32-009, Revision 02,
dated September 30, 2019. This service information describes procedures
for modification of the NLG shock strut cylinder. These documents are
distinct since they apply to different airplane serial numbers. This
service information is reasonably available because the interested
parties have access to it through their normal course of business or by
the means identified in the ADDRESSES section.
Costs of Compliance
The FAA estimates that this AD affects 560 airplanes of U.S.
registry. The FAA estimates the following costs to comply with this AD:
Estimated Costs for Required Actions
----------------------------------------------------------------------------------------------------------------
Labor cost Parts cost Cost per product Cost on U.S. operators
----------------------------------------------------------------------------------------------------------------
Up to 54 work-hours x $85 per hour = $43,999 Up to $48,589......... Up to $27,209,840
Up to $4,590.
----------------------------------------------------------------------------------------------------------------
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 (AD):
2020-25-06 Bombardier, Inc.: Amendment 39-21348; Docket No. FAA-
2020-0458; Product Identifier 2020-NM-029-AD.
(a) Effective Date
This AD is effective January 27, 2021.
(b) Affected ADs
None.
(c) Applicability
This AD applies to Bombardier, Inc., Model BD-100-1A10
airplanes, certificated in any category, serial numbers (S/Ns) 20003
through 20767 inclusive.
(d) Subject
Air Transport Association (ATA) of America Code 32, Landing
gear.
(e) Reason
This AD was prompted by a report that corrosion was found on the
shock strut cylinders during unscheduled maintenance of the nose
landing gear (NLG). The FAA is issuing this AD to address corrosion
of the NLG, which could result in structural failure of the NLG.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Modification for Airplanes With S/N 20003 Through 20500 Inclusive
For Bombardier, Inc., Model BD-100-1A10 airplanes with S/N 20003
through 20500 inclusive: At the applicable compliance time specified
in paragraph (g)(1) or (2) of this AD, do the modification in
paragraph (g)(1) or (2) of this AD, as applicable.
(1) For airplanes with NLG assemblies with 96 months or less
time since new (TSN) as of the effective date of this AD: At the NLG
96-month scheduled inspection, do a modification of the NLG shock
strut cylinder, in accordance with paragraph 2.B. of the
Accomplishment Instructions of Bombardier Service Bulletin 100-32-
33, Revision 02, dated September 30, 2019.
(2) For airplanes with NLG assemblies with more than 96 months
TSN as of the effective date of this AD: At the applicable
compliance time specified in figure 1 to paragraph (g) of this AD,
do a modification of the NLG shock strut cylinder, in accordance
with paragraph 2.C. of the Accomplishment Instructions of Bombardier
Service Bulletin 100-32-33, Revision 02, dated September 30, 2019.
[[Page 83761]]
[GRAPHIC] [TIFF OMITTED] TR23DE20.001
(h) Modification for Airplanes With S/N 20501 Through 20767 Inclusive
For Bombardier, Inc., Model BD-100-1A10 airplanes with S/N 20501
through 20767 inclusive: At the NLG 96-month scheduled inspection,
do a modification of the NLG shock strut cylinder, in accordance
with paragraph 2.B. of the Accomplishment Instructions of Bombardier
Service Bulletin 350-32-009, Revision 02, dated September 30, 2019.
(i) Parts Installation Limitation
As of the effective date of this AD, no person may install, on
any airplane, an NLG shock strut assembly with part number (P/N)
40630-111, P/N 40630-113, or P/N 44630-101, unless it has been
modified in accordance with paragraphs 2.B. or 2.C. of the
Accomplishment Instructions of Bombardier Service Bulletin 100-32-
33, Revision 02, dated September 30, 2019; or paragraph 2.B. of the
Accomplishment Instructions of Bombardier Service Bulletin 350-32-
009, Revision 02, dated September 30, 2019; as applicable.
(j) Credit for Previous Actions
(1) This paragraph provides credit for actions required by
paragraph (g) of this AD, if those actions were performed before the
effective date of this AD using paragraph 2.B. or 2.C., as
applicable, of Bombardier Service Bulletin 100-32-33, dated October
31, 2018; or Bombardier Service Bulletin 100-32-33, Revision 01,
July 31, 2019.
(2) This paragraph provides credit for actions required by
paragraph (h) of this AD, if those actions were performed before the
effective date of this AD using paragraph 2.B. of Bombardier Service
Bulletin 350-32-009, dated October 31, 2018; or Bombardier Service
Bulletin 350-32-009, Revision 01 dated July 31, 2019; provided that
the NLG shock strut assembly with P/N 44630-101 was removed in lieu
of P/N 44610-101, as specified in paragraph 2.B.(1) of the
Accomplishment Instructions of Bombardier Service Bulletin 350-32-
009, dated October 31, 2018; or Bombardier Service Bulletin 350-32-
009, Revision 01 dated July 31, 2019.
(k) Other FAA AD Provisions
The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New
York ACO Branch, FAA, has the authority to approve AMOCs for this
AD, if requested using the procedures found in 14 CFR 39.19. In
accordance with 14 CFR 39.19, send your request to your principal
inspector or local Flight Standards District Office, as appropriate.
If sending information directly to the manager of the certification
office, send it to ATTN: Program Manager, Continuing Operational
Safety, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7300; fax 516-794-5531. Before
using any approved AMOC, notify your appropriate principal
inspector, or lacking a principal inspector, the manager of the
local flight standards district office/certificate holding district
office.
(2) Contacting the Manufacturer: For any requirement in this AD
to obtain instructions from a manufacturer, the instructions must be
accomplished using a method approved by the Manager, New York ACO
Branch, FAA; or Transport Canada Civil Aviation (TCCA); or
Bombardier's TCCA Design Approval Organization (DAO). If approved by
the DAO, the approval must include the DAO-authorized signature.
(l) Related Information
(1) Refer to Mandatory Continuing Airworthiness Information
(MCAI) Canadian AD CF-2019-43, dated November 8, 2019, for related
information. This MCAI may be found in the AD docket on the internet
at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and locating Docket
No. FAA-2020-0458.
(2) For more information about this AD, contact Darren Gassetto,
Aerospace Engineer, Mechanical Systems and Administrative Services
Section, FAA, New York ACO Branch, 1600 Stewart Avenue, Suite 410,
Westbury, NY 11590; telephone 516-228-7323; fax 516-794-5531; email
<a href="/cdn-cgi/l/email-protection#291004485f5a044750484a46044a465a694f4848074e465f"><span class="__cf_email__" data-cfemail="61584c0017124c0f1800020e4c020e12210700004f060e17">[email protected]</span></a>.
(3) Service information identified in this AD that is not
incorporated by reference is available at the addresses specified in
paragraphs (m)(3) and (4) of this AD.
(m) Material Incorporated by Reference
(1) The Director of the Federal Register approved the
incorporation by reference (IBR) of the service information listed
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
(2) You must use this service information as applicable to do
the actions required by this AD, unless this AD specifies otherwise.
(i) Bombardier Service Bulletin 100-32-33, Revision 02, dated
September 30, 2019.
(ii) Bombardier Service Bulletin 350-32-009, Revision 02, dated
September 30, 2019.
(3) For service information identified in this AD, contact
Bombardier, Inc., 200 C[ocirc]te-Vertu Road West, Dorval,
Qu[eacute]bec H4S 2A3, Canada; North America toll-free telephone 1-
866-538-1247 or direct-dial telephone 1-514-855-2999; email
<a href="/cdn-cgi/l/email-protection#96f7f5b8efe3fad6f7f3e4f9b8f4f9fbf4f7e4f2fff3e4b8f5f9fb"><span class="__cf_email__" data-cfemail="4223216c3b372e022327302d6c202d2f202330262b27306c212d2f">[email protected]</span></a>; internet <a href="http://www.bombardier.com">http://www.bombardier.com</a>.
(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 <a href="/cdn-cgi/l/email-protection#96f0f3f2e4f3f1b8faf3f1f7fad6f8f7e4f7b8f1f9e0"><span class="__cf_email__" data-cfemail="7f191a1b0d1a1851131a181e133f111e0d1e51181009">[email protected]</span></a>, or go to: <a href="https://www.archives.gov/federal-register/cfr/ibr-locations.html">https://www.archives.gov/federal-register/cfr/ibr-locations.html</a>.
Issued on December 1, 2020.
Gaetano A. Sciortino,
Deputy Director for Strategic Initiatives, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2020-28282 Filed 12-22-20; 8:45 am]
BILLING CODE 4910-13-P
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.
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