Proposed Rule2021-27622
Airworthiness Directives; Bell Textron Canada Limited Helicopters
Primary source
Metadata and text below are from the Federal Register, a public-domain U.S. government work. Always verify the official published version before relying on it for any legal matter.
Published
December 23, 2021
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to adopt a new airworthiness directive (AD) for certain Bell Textron Canada Limited Model 429 helicopters. This proposed AD was prompted by reports of failed rivets between the tailboom skin and the tail rotor (TR) gearbox support assembly. This proposed AD would require visually inspecting the external surface of the TR gearbox support assembly, borescope inspecting or visually inspecting the inside of the tailboom for certain conditions, and performing a tactile inspection. Depending on the results of the inspections, this proposed AD would require removing certain rivets from service or repairing gaps in accordance with FAA-approved methods. This proposed AD would also require repeating these inspections within certain intervals. The FAA is proposing this AD to address the unsafe condition on these products.
Full Text
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<title>Federal Register, Volume 86 Issue 244 (Thursday, December 23, 2021)</title>
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[Federal Register Volume 86, Number 244 (Thursday, December 23, 2021)]
[Proposed Rules]
[Pages 72891-72894]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-27622]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-1074; Project Identifier MCAI-2021-00447-R]
RIN 2120-AA64
Airworthiness Directives; Bell Textron Canada Limited Helicopters
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Bell Textron Canada Limited Model 429 helicopters. This
proposed AD was prompted by reports of failed rivets between the
tailboom skin and the tail rotor (TR) gearbox support assembly. This
proposed AD would require visually inspecting the external surface of
the TR gearbox support assembly, borescope inspecting or visually
inspecting the inside of the tailboom for certain conditions, and
performing a tactile inspection. Depending on the results of the
inspections, this proposed AD would require removing certain rivets
from service or repairing gaps in accordance with FAA-approved methods.
This proposed AD would also require repeating these inspections within
certain intervals. 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 February 7,
2022.
ADDRESSES: You may send comments, using the procedures found in 14 CFR
11.43 and 11.45, by any of the following methods:
<bullet> Federal eRulemaking Portal: Go to <a href="https://www.regulations.gov">https://www.regulations.gov</a>. Follow the instructions for submitting comments.
<bullet> Fax: (202) 493-2251.
<bullet> 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.
<bullet> Hand Delivery: Deliver to Mail address between 9 a.m. and
5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Bell
Textron Canada Limited, 12,800 Rue de l'Avenir, Mirabel, Quebec J7J
1R4, Canada; telephone 1-450-437-2862 or 1-800-363-8023; fax 1-450-433-
0272; email <a href="/cdn-cgi/l/email-protection#4434362b20312730373134342b3630042621282822282d232c306a272b29"><span class="__cf_email__" data-cfemail="acdcdec3c8d9cfd8dfd9dcdcc3ded8eccec9c0c0cac0c5cbc4d882cfc3c1">[email protected]</span></a>; or at <a href="https://www.bellflight.com/support/contact-support">https://www.bellflight.com/support/contact-support</a>. You may view this service
information at the FAA, Office of the Regional Counsel, Southwest
Region, 10101 Hillwood Pkwy., Room 6N-321, Fort Worth, TX 76177. For
information on the availability of this material at the FAA, call (817)
222-5110.
Examining the AD Docket
You may examine the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No.
[[Page 72892]]
FAA-2021-1074; 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 Transport Canada AD, any comments received, and
other information. The street address for Docket Operations is listed
above.
FOR FURTHER INFORMATION CONTACT: Andrea Jimenez, Aerospace Engineer,
COS Program Management Section, Operational Safety Branch, Compliance &
Airworthiness Division, FAA, 1600 Stewart Ave., Suite 410, Westbury, NY
11590; telephone (516) 228-7330; email <a href="/cdn-cgi/l/email-protection#d2b3bcb6a0b7b3fcb8bbbfb7bcb7a892b4b3b3fcb5bda4"><span class="__cf_email__" data-cfemail="04656a607661652a6e6d69616a617e446265652a636b72">[email protected]</span></a>.
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-2021-1074; Project Identifier
MCAI-2021-00447-R'' 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
this 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
<a href="https://www.regulations.gov">https://www.regulations.gov</a>, including any personal information you
provide. The agency will also post a report summarizing each
substantive verbal contact received about this NPRM.
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
Andrea Jimenez, Aerospace Engineer, COS Program Management Section,
Operational Safety Branch, Compliance & Airworthiness Division, FAA,
1600 Stewart Ave., Suite 410, Westbury, NY 11590; telephone (516) 228-
7330; email <a href="/cdn-cgi/l/email-protection#1b7a757f697e7a357172767e757e615b7d7a7a357c746d"><span class="__cf_email__" data-cfemail="7a1b141e081f1b541013171f141f003a1c1b1b541d150c">[email protected]</span></a>. 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, which is the aviation authority for Canada, has
issued Canadian AD CF-2021-15, dated April 14, 2021 (Transport Canada
AD CF-2021-15), to correct an unsafe condition for Bell Textron Canada
Limited Model 429 helicopters, serial numbers (S/N) 57001 and
subsequent. Transport Canada advises of multiple in-service reports of
failed rivets at the joint between the tailboom skin and the TR gearbox
support assembly part number (P/N) 429-034-701-101 or P/N 429-035-705-
101. Transport Canada states that in-service reports also revealed a
quality escape resulted in a gapping condition between the tailboom
skin and the TR gearbox support fitting at some locations around the
joint, and that rivets of inadequate grip length have been installed at
the affected joint. This condition, if not addressed, could result in
progressive deterioration of the joint structural integrity, detachment
of the TR gearbox support assembly and loss of control of the
helicopter.
Accordingly, Transport Canada AD CF-2021-15 requires for certain
serial-numbered helicopters an initial visual inspection of the rivets
at the TR gearbox support assembly for signs of failed rivets or
inadequate grip length. Transport Canada AD CF-2021-15 also requires,
for all serial-numbered helicopters defined in the applicability,
repeating the initial visual inspection at intervals not to exceed 400
hours air time or 12 months, whichever occurs first. Transport Canada
AD CF-2021-15 also requires repair or replacement of affected parts if
discrepancies are found. Transport Canada considers its AD an interim
action and states that further AD action may follow.
FAA's Determination
These helicopters have been approved by the aviation authority of
Canada and are approved for operation in the United States. Pursuant to
the FAA's bilateral agreement with Canada, Transport Canada, its
technical representative, has notified the FAA of the unsafe condition
described in its AD. The FAA is proposing this AD after evaluating all
known relevant information and determining that the unsafe condition
described previously is likely to exist or develop on other helicopters
of these same type designs.
Related Service Information Under 1 CFR Part 51
The FAA reviewed Bell Alert Service Bulletin 429-19-47, Revision B,
dated January 27, 2021 (ASB 429-19-47). This service information
specifies procedures for an initial and repetitive general visual
inspections and detailed inspections of the affected rivets at the
joint between the tailboom skin and the TR gearbox support assembly.
This service information also specifies procedures for replacing the
affected rivets and repairing the gaps in accordance with an approved
Bell structural repair scheme.
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.
Proposed AD Requirements in This NPRM
For Model 429 helicopters with S/N 57002 through 57210 inclusive
and S/N 57212 and subsequent that, as of the effective date of this AD,
have accumulated less than 300 total hours time-in-service (TIS),
before accumulating 400 total hours TIS; or for helicopters with S/N
57002 through 57210 inclusive and S/N 57212 and subsequent that, as of
the effective date of this AD, have replaced certain part-numbered TR
gearbox support assemblies and the helicopter has accumulated less than
300 total hours TIS since the replacement of the TR gearbox support
assembly, before accumulating 400 total hours TIS since the
replacement, this proposed AD would require visually inspecting the
external surface of the TR gearbox support assembly for any rivet heads
that have separated from their tail, measuring any gaps, and before
further flight, removing affected rivets from service or repairing gaps
in accordance with FAA-approved methods.
This proposed AD would also require either borescope inspecting or
using a light source and mirror to visually inspect each rivet inside
the tailboom for missing rivet tails, rivet tails not resting against
the tailboom skin, and any rivet tails resting at the bottom of the
tailboom. Depending on the inspection results, this proposed AD would
require, before further flight, additional inspections or removing
certain parts from service. This proposed AD would require performing a
tactile inspection of certain rivets
[[Page 72893]]
identified in the applicable service information and depending on the
inspection results, removing rivets from service before further flight.
For Model 429 helicopters with S/N 57002 through 57210 inclusive
and S/N 57212 and subsequent that are not identified in paragraph
(g)(1) of this AD, this proposed AD would require, within 100 hours TIS
after the effective date of this AD, performing the visual inspection
of the TR gearbox support assembly, visually inspecting or borescope
inspecting each rivet inside the tailboom, performing the tactile
inspection, and accomplishing the applicable corrective actions
described previously.
For Model 429 helicopters S/N 57002 through 57210 inclusive and S/N
57212 and subsequent this proposed AD would require, within 400 hours
TIS after the initial inspections required by this proposed AD, as
applicable to your helicopter, and thereafter at intervals not to
exceed 400 hours TIS, performing the visual inspection of the TR
gearbox support assembly, visually inspecting or borescope inspecting
each rivet inside the tailboom, performing the tactile inspection, and
accomplishing the applicable corrective actions described previously.
For Model 429 helicopters S/N 57001 and 57211, this proposed AD
would require, within 400 hours TIS after the effective date of this
proposed AD and thereafter at intervals not to exceed 400 hours TIS,
performing the visual inspection of the TR gearbox support assembly,
visually inspecting or borescope inspecting each rivet inside the
tailboom, performing the tactile inspection, and accomplishing the
applicable corrective actions described previously.
Differences Between This Proposed AD and the Transport Canada AD
Transport Canada AD CF-2021-15 requires replacing any rivets, and
repairing any gaps that exceed 0.005 in (0.127 mm), in accordance with
an approved Bell structural repair scheme, and submitting certain
information to the manufacturer, whereas this proposed AD would require
removing the rivets from service and repairing the gaps using an FAA-
approved method instead. Transport Canada AD CF-2021-15 requires
replacing any rivets if any gaps are 0.005 in (0.127mm) or less,
whereas this proposed AD would require removing the rivets from
service.
Transport Canada AD CF-2021-15 also requires for certain serial-
numbered helicopters that have accumulated less than 300 hours air
time, or have replaced a certain part-numbered TR gearbox support
assembly and have accumulated less than 300 hours air time since the
replacement, within 100 hours air time or 6 months upon reaching 300
hours air time, whichever occurs first, performing the visual
inspection of the TR gearbox support assembly, visually inspecting or
borescope inspecting each rivet inside the tailboom, performing the
tactile inspection, and accomplishing the applicable corrective actions
described previously, whereas this proposed AD would require these
actions for certain helicopters before accumulating 400 total hours TIS
and for certain other helicopters, before the helicopter accumulates
400 total hours TIS since the replacement of a certain part-numbered TR
gearbox support assembly.
Additionally, Transport Canada AD CF-2021-15 requires for certain
serial-numbered helicopters that have accumulated 300 hours air time or
more, or have replaced a certain part-numbered TR gearbox support
assembly and have accumulated 300 hours air time or more since the
replacement, within 100 hours air time or 6 months, whichever occurs
first, performing the visual inspection of the TR gearbox support
assembly, visually inspecting or borescope inspecting each rivet inside
the tailboom, performing the tactile inspection, and accomplishing the
applicable corrective actions described previously, whereas this
proposed AD would require these actions within 100 hours TIS after the
effective date of this AD.
Finally, Transport Canada AD CF-2021-15 requires repeating the
visual inspection of the TR gearbox support assembly, the visual
inspection or borescope inspection of each rivet inside the tailboom,
performing the tactile inspection, and accomplishing the applicable
corrective actions described previously at intervals not to exceed 400
hours air time or 12 months, whichever occurs first, whereas this
proposed AD would require for certain serial-numbered helicopters, the
repetitive inspections to occur within 400 hours TIS after the
effective date of this AD, and thereafter at intervals not to exceed
400 hours TIS.
Interim Action
The FAA considers this proposed AD would be an interim action. Once
final action has been identified, the FAA might consider further
rulemaking.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 120 helicopters of U.S. Registry. Labor rates are estimated at
$85 per work-hour. Based on these numbers, the FAA estimates the
following costs to comply with this proposed AD.
Visually inspecting the surface of the TR gearbox support assembly
would take about 0.5 work-hour for an estimated cost of $43 per
inspection and $5,160 for the U.S. fleet per inspection.
If required, replacing any affected rivets would take about 1 work-
hour and parts would cost about $110 per rivet for an estimated cost of
$195 per rivet replacement.
If required, measuring gaps would take about 0.5 work-hour for an
estimated cost of $43 per helicopter.
If required, repairing any gaps would take up to about 1 work-hour
for an estimated cost of up to $85 per repair.
Visually inspecting or borescope inspecting the inside of the
tailboom would take about 0.5 work-hour for an estimated cost of $43
per inspection and $5,160 for the U.S. fleet per inspection.
Performing a tactile inspection would take about 0.5 work-hour for
an estimated cost of $43 per inspection and $5,160 for the U.S. fleet
per inspection.
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, I certify this proposed regulation:
[[Page 72894]]
(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:
Bell Textron Canada Limited: Docket No. FAA-2021-1074; Project
Identifier MCAI-2021-00447-R.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by February 7, 2022.
(b) Affected ADs
None.
(c) Applicability
This AD applies to Bell Textron Canada Limited Model 429
helicopters, serial numbers (S/N) 57001 and subsequent, certificated
in any category.
(d) Subject
Joint Aircraft Service Component (JASC) Code: 5302, Rotorcraft
tail boom.
(e) Unsafe Condition
This AD was prompted by reports of failed rivets between the
tailboom skin and the tail rotor (TR) gearbox support assembly. The
FAA is issuing this AD to detect failed rivets and rivets with
inadequate grip length. The unsafe condition, if not addressed,
could result in deterioration of the joint structural integrity,
detachment of the TR gearbox support assembly, and loss of
helicopter control.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Required Actions
(1) As of the effective date of this AD, for Model 429
helicopters S/N 57002 through 57210 inclusive and S/N 57212 and
subsequent that have accumulated less than 300 total hours time-in-
service (TIS), before accumulating 400 total hours TIS; or for Model
429 helicopters S/N 57002 through 57210 inclusive and S/N 57212 and
subsequent that have replaced the TR gearbox support assembly part
number (P/N) 429-034-701-101 or P/N 429-035-705-101 and the
helicopter has accumulated less than 300 total hours TIS since the
replacement of the TR gearbox support assembly, before accumulating
400 total hours TIS since the replacement:
(i) Visually inspect the external surface of the TR gearbox
support assembly for any rivet heads that have separated from their
tail. If there are any rivet heads that have separated from their
tail, before further flight, measure any gaps between the TR gearbox
support assembly and the tailboom skin by following the
Accomplishment Instructions, Part I, paragraphs 9.b. through 9.d of
Bell Alert Service Bulletin 429-19-47, Revision B, dated January 27,
2021 (ASB 429-19-47 Rev B).
(A) If there are no gaps or if any gap measures less than 0.005
in (0.127 mm), before further flight, remove the rivets from
service.
(B) If there are any gaps that are equal to or exceed 0.005 in
(0.127 mm), before further flight, repair the gaps in accordance
with an FAA-approved method, and remove the rivets from service.
(ii) Borescope inspect or use a light source and mirror to
visually inspect each rivet inside the tailboom for any missing
rivet tails, any rivet tails resting at the bottom of the tailboom,
and any rivet tails not resting against the tailboom skin.
(A) If there are any missing rivet tails, or any rivet tails
resting at the bottom of the tailboom, before further flight,
measure any gaps between the TR gearbox support assembly and the
tailboom skin by following the Accomplishment Instructions, Part I,
paragraphs 9.b. through 9.d of ASB 429-19-47 Rev B, and perform the
corrective actions specified in paragraphs (g)(1)(i)(A) or (B) of
this AD as applicable.
(B) If there are any rivet tails not resting against the
tailboom skin before further flight, remove the rivets from service.
(iii) Perform a tactile inspection of the rivets identified in
Figure 1 of ASB 429-19-47 Rev B, by pulling on each rivet tail with
pliers or pulling by hand. If any rivet does not come out when
pulled with pliers or when pulled by hand, before further flight,
remove the rivet from service.
(2) For Model 429 helicopters S/N 57002 through 57210 inclusive
and S/N 57212 and subsequent that are not identified in paragraph
(g)(1) of this AD, within 100 hours TIS after the effective date of
this AD, perform the actions as specified in paragraph (g)(1)(i)
through (iii) of this AD.
(3) For Model 429 helicopters S/N 57002 through 57210 inclusive
and S/N 57212 and subsequent, within 400 hours TIS after the initial
inspections required by paragraph (g)(1) or (2) of this AD, as
applicable to your helicopter, and thereafter at intervals not to
exceed 400 hours TIS, accomplish the actions required by paragraphs
(g)(1)(i) through (iii) of this AD.
(4) For Model 429 helicopters S/N 57001 and 57211, within 400
hours TIS after the effective date of this AD, and thereafter at
intervals not to exceed 400 hours TIS, accomplish the actions
required by paragraphs (g)(1)(i) through (iii) of this AD.
(h) Credit for Previous Actions
This paragraph provides credit for the actions specified in
paragraphs (g)(1) and (2) of this AD, if those actions were
performed before the effective date of this AD using Bell Alert
Service Bulletin 429-19-47, Revision A, dated November 2, 2020, or
Bell Alert Service Bulletin 429-19-47, dated August 28, 2019.
(i) Alternative Methods of Compliance (AMOCs)
(1) The Manager, International Validation 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 International Validation Branch, send
it to the attention of the person identified in paragraph (j)(1) of
this AD. Information may be emailed to: <a href="/cdn-cgi/l/email-protection#80b9adc1d6d3adc1c9d2adb7b3b0adc1cdcfc3c0e6e1e1aee7eff6"><span class="__cf_email__" data-cfemail="1a23375b4c49375b5348372d292a375b5755595a7c7b7b347d756c">[email protected]</span></a>.
(2) 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.
(j) Related Information
(1) For more information about this AD, contact Andrea Jimenez,
Aerospace Engineer, COS Program Management Section, Operational
Safety Branch, Compliance & Airworthiness Division, FAA, 1600
Stewart Ave., Suite 410, Westbury, NY 11590; telephone (516) 228-
7330; email <a href="/cdn-cgi/l/email-protection#c5a4aba1b7a0a4ebafaca8a0aba0bf85a3a4a4eba2aab3"><span class="__cf_email__" data-cfemail="b3d2ddd7c1d6d29dd9daded6ddd6c9f3d5d2d29dd4dcc5">[email protected]</span></a>.
(2) For service information identified in this AD, contact Bell
Textron Canada Limited, 12,800 Rue de l'Avenir, Mirabel, Quebec J7J
1R4, Canada; telephone 1-450-437-2862 or 1-800-363-8023; fax 1-450-
433-0272; email <a href="/cdn-cgi/l/email-protection#0676746962736572757376766974724664636a6a606a6f616e722865696b"><span class="__cf_email__" data-cfemail="1161637e75647265626461617e63655173747d7d777d787679653f727e7c">[email protected]</span></a>; or at <a href="https://www.bellflight.com/support/contact-support">https://www.bellflight.com/support/contact-support</a>. You may view this
referenced service information at the FAA, Office of the Regional
Counsel, Southwest Region, 10101 Hillwood Pkwy., Room 6N-321, Fort
Worth, TX 76177. For information on the availability of this
material at the FAA, call (817) 222-5110.
(3) The subject of this AD is addressed in Transport Canada AD
CF-2021-15, dated April 14, 2021. You may view the Transport Canada
AD on the internet at <a href="https://www.regulations.gov">https://www.regulations.gov</a> in Docket No. FAA-
2021-1074.
Issued on December 15, 2021.
Ross Landes,
Deputy Director for Regulatory Operations, Compliance & Airworthiness
Division, Aircraft Certification Service.
[FR Doc. 2021-27622 Filed 12-22-21; 8:45 am]
BILLING CODE 4910-13-P
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This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.