Proposed Rule2021-24102
Airworthiness Directives; Viking Air Limited (Type Certificate Previously Held by Bombardier, Inc., de Havilland, Inc.) Airplanes
Primary source
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Published
November 8, 2021
Issuing agencies
Transportation DepartmentFederal Aviation Administration
Abstract
The FAA proposes to supersede Airworthiness Directive (AD) 80- 13-10, AD 80-13-12 R1, and AD 2008-03-01, which apply to certain de Havilland (type certificate now held by Viking Air Limited) Model DHC- 6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes. AD 80-13-10 requires repetitively inspecting the main landing gear (MLG) legs for cracks and corrosion. AD 80-13-12 R1 requires repetitively inspecting each engine nacelle lower longeron for cracks and buckling. AD 2008-03- 01 requires incorporating inspections, modifications, and life limits of certain structural components into the aircraft maintenance program. Since the FAA issued those ADs, new and more restrictive airworthiness limitations have been issued for certain structural components. This proposed AD would require incorporating into maintenance records new or revised life limits, modification limits, and inspection or overhaul 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 213 (Monday, November 8, 2021)</title>
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[Federal Register Volume 86, Number 213 (Monday, November 8, 2021)]
[Proposed Rules]
[Pages 61719-61722]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2021-24102]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2021-0960; Project Identifier 2019-CE-021-AD]
RIN 2120-AA64
Airworthiness Directives; Viking Air Limited (Type Certificate
Previously Held by Bombardier, Inc., de Havilland, Inc.) Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking (NPRM).
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SUMMARY: The FAA proposes to supersede Airworthiness Directive (AD) 80-
13-10, AD 80-13-12 R1, and AD 2008-03-01, which apply to certain de
Havilland (type certificate now held by Viking Air Limited) Model DHC-
6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes. AD 80-13-10
requires repetitively inspecting the main landing gear (MLG) legs for
cracks and corrosion. AD 80-13-12 R1 requires repetitively inspecting
each engine nacelle lower longeron for cracks and buckling. AD 2008-03-
01 requires incorporating inspections, modifications, and life limits
of certain structural components into the aircraft maintenance program.
Since the FAA issued those ADs, new and more restrictive airworthiness
limitations have been issued for certain structural components. This
proposed AD would require incorporating into maintenance records new or
revised life limits, modification limits, and inspection or overhaul
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 December
23, 2021.
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 above between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
For service information identified in this NPRM, contact Viking Air
Limited Technical Support, 1959 De Havilland Way, Sidney, British
Columbia, Canada, V8L 5V5; phone: (North America) (800) 663-8444; fax:
(250) 656-0673; email: <a href="/cdn-cgi/l/email-protection#196d7c7a7177707a7875376a6c6969766b6d596f707270777e78706b377a7674"><span class="__cf_email__" data-cfemail="9beffef8f3f5f2f8faf7b5e8eeebebf4e9efdbedf2f0f2f5fcfaf2e9b5f8f4f6">[email protected]</span></a>; website:
<a href="https://www.vikingair.com/support/service-bulletins">https://www.vikingair.com/support/service-bulletins</a>. You may view this
service information at the Airworthiness Products Section, Operational
Safety Branch, FAA, 901 Locust, Kansas City, MO 64106. For information
on the availability of this material at the FAA, call (816) 329-4148.
[[Page 61720]]
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. FAA-2021-0960; 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 MCAI,
any comments received, and other information. The street address for
Docket Operations is listed above.
FOR FURTHER INFORMATION CONTACT: Aziz Ahmed, Aviation Safety Engineer,
New York ACO Branch, FAA, 1600 Stewart Avenue, Suite 410, Westbury, NY
11590; phone: (516) 228-7329; fax: (516) 794-5531; email:
<a href="/cdn-cgi/l/email-protection#7c1d061506521d141119183c1a1d1d521b130a"><span class="__cf_email__" data-cfemail="34554e5d4e1a555c595150745255551a535b42">[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 the ADDRESSES section. Include ``Docket No. FAA-2021-0960;
Project Identifier 2019-CE-021-AD'' 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
<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 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 Aziz
Ahmed, Aviation Safety Engineer, New York ACO Branch, FAA, 1600 Stewart
Avenue, Suite 410, Westbury, NY 11590. Any commentary that the FAA
receives which is not specifically designated as CBI will be placed in
the public docket for this rulemaking.
Background
The FAA issued AD 80-13-10, Amendment 39-3812 (45 FR 43155, June
26, 1980) (AD 80-13-10) for de Havilland (type certificate now held by
Viking Air Limited) Model ``DHC-6 type'' airplanes with certain MLG
legs. AD 80-13-10 was prompted by several incidents involving collapse
of the MLG. AD 80-13-10 requires repetitively inspecting the weld
juncture at the Y-joint of the MLG legs for cracks and corrosion. The
FAA issued AD 80-13-10 to prevent failure of the MLG legs at the Y-
joint weld, which could result in wing damage during taxiing
operations.
The FAA issued AD 80-13-12 R1, Amendment 39-4135 (46 FR 31251, June
15, 1981) (AD 80-13-12 R1) for certain serial-numbered de Havilland
(now Viking Air Limited) Model ``DHC-6 type'' airplanes with
intermediate or high floatation tires, skis, or floats. AD 80-13-12 R1
was prompted by reports of cracks or buckling on the engine nacelle
lower longerons. AD 80-13-12 R1 requires repetitively inspecting each
engine nacelle lower longeron for cracks and buckling. The FAA issued
AD 80-13-12 R1 to prevent possible failure of the engine nacelle lower
longerons due to cracking or buckling.
The FAA issued AD 2008-03-01, Amendment 39-15350 (73 FR 5729,
January 31, 2008) (AD 2008-03-01), for all Viking Air Limited Model
DHC-6-1, DHC-6-100, DHC-6-200, and DHC-6-300 airplanes. AD 2008-03-01
was prompted by structural evaluations of the DHC-6 series airplanes
that showed the service life limits and inspection schedules needed to
be revised. AD 2008-03-01 was based on Canadian AD CF-2000-14, dated
May 25, 2000 (AD CF-2000-14), issued by Transport Canada, which is the
aviation authority for Canada. AD 2008-03-01 requires incorporating the
inspections, modifications, and life limits (retirement) of certain
structural components, as contained in Revision 5 of the DHC-6 Product
Support Manual (PSM) 1-6-11, into the aircraft maintenance program. The
FAA issued AD 2008-03-01 to maintain the structural integrity of the
airplane.
Actions Since AD 2008-03-01 Was Issued
Since the FAA issued AD 2008-03-01, Transport Canada has superseded
AD CF-2000-14 and issued Canadian AD CF-2019-02, dated January 9, 2019
(referred to after this as ``the MCAI''). The MCAI applies to all
Viking Air Limited (formerly de Havilland) Model DHC-6 series 1, DHC-6
series 100, DHC-6 series 110, DHC-6 series 200, DHC-6 series 210, DHC-6
series 300, DHC-6 series 310, DHC-6 series 320, and DHC-6 series 400
airplanes. The MCAI states:
The airworthiness limitations for DHC-6 aeroplanes are defined
and published in the Viking Air Ltd. (Viking) Airframe Airworthiness
Limitations Manual, Product Support Manual (PSM) 1-6-11, approved by
Transport Canada. The instructions contained in PSM 1-6-11 have been
identified as mandatory actions for continued airworthiness. Failure
to comply with those instructions could result in an unsafe
condition.
Viking Air Ltd. published Revision 9 of PSM 1-6-11 earlier in
2018. Revision 9 of PSM 1-6-11, dated 30 April 2018, includes some
new and/or more restrictive limitations than those contained in
Revision 5. For the reason described above, this [Transport Canada]
AD requires implementation of the actions specified in PSM 1-6-11
Revision 9.
The compliance requirements for several of the tasks in PSM 1-6-
11 were previously a range of flight hours and flight cycles. With
Revision 9 of PSM 1-6-11, the range-based requirements have been
changed to specific flight hours and flight cycle limits. This
[Transport Canada] AD provides a phase-in allowance for those
limitations so that operators will have the opportunity to schedule
the modifications and inspections required by the limitations. The
phase-in allowances are intended to mitigate the impact of changing
from compliance ranges to compliance limits for aeroplanes that are
approaching or have exceeded the limits on the effective date of the
[Transport Canada] AD.
Revision 9 of PSM 1-6-11 also includes some airworthiness
limitations that were previously contained in service bulletins (SB)
or other PSMs. Some of those limitations were mandated by [Transport
Canada] ADs, specifically AD CF-80-06, CF-81-07R4 and CF-95-12.
Because the affected limitations will now be controlled in PSM 1-6-
11, the above mentioned [Transport Canada] ADs are superseded by
this [Transport Canada] AD.
The following are new tasks in PSM 1-6-11 Revision 9:
1. Task 27-007 Replacement of flight control pulleys at Fuselage
Station (FS) 270.
2. Tasks 32-001 and 32-002 Overhaul of main landing gear leg.
There is an associated requirement to ensure that each affected part
has been assigned a unique serial number.
3. Task 53-006 Inspection of the skin flange of machined frame
at FS 239.
4. Tasks 54-003 to 54-010 Inspection of nacelle longerons.
[[Page 61721]]
5. Tasks 57-039 to 57-041 Inspection for wing upper skin
disbond.
Task 27-004 Replacement of flight control cables after spillage
of corrosive materials in PSM 1-6-11 was limited to landplane
configurations in previous revisions of PSM 1-6-11 but is now
applicable to all configurations.
The intent of the word ``airframe'' in PSM 1-6-11 Revision 9 is
to include fuselage, nacelles, struts, interiors, cowlings,
fairings, airfoils, landing gear and their controls. The airframe
life limitation in PSM 1-6-11 Revision 9 is not intended to apply to
components such as those in the fuel, electrical and hydraulic
systems that are occasionally transferred from one aeroplane to
another and may be salvaged from an aeroplane that is retired from
service for use on an in-service aeroplane. PSM 1-6-13 defines
current airworthiness limitations for DHC-6 avionics that are not
addressed in this [Transport Canada] AD.
Model DHC-6-400 airplanes were type certificated after AD CF-2000-
14 was issued and are subject to the same unsafe condition. You may
examine the MCAI in the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by
searching for and locating Docket No. FAA-2021-0960.
Related Service Information Under 1 CFR Part 51
The FAA reviewed DHC-6 Twin Otter PSM 1-6-11, Airframe
Airworthiness Limitations Manual, Revision 9, dated April 30, 2018. The
service information contains airworthiness limitations for certain
structural components. 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 this State of Design Authority, it
has notified the FAA of the unsafe condition described in the MCAI and
service information referenced above. The FAA is issuing this NPRM
after determining the unsafe condition described previously is likely
to exist or develop on other products of the same type design.
Proposed AD Requirements
This proposed AD would require incorporating into maintenance
records new or revised life limits, modification limits, and inspection
or overhaul intervals. This proposed AD would also allow a ``phase-in''
compliance period for the initial completion of certain tasks.
ADs Mandating Airworthiness Limitations
The FAA has previously mandated airworthiness limitations by
issuing ADs that require revising the airworthiness limitation section
(ALS) of the existing maintenance manual or instructions for continued
airworthiness to incorporate new or revised inspections and life
limits. This proposed AD, however, would require incorporating new or
revised inspections and life limits into the maintenance records
required by 14 CFR 91.417(a)(2) or 135.439(a)(2) for your airplane. The
FAA does not intend this as a substantive change. Requiring
incorporation of the new ALS requirements into the maintenance records,
rather than requiring individual repetitive inspections and
replacements, allows operators to record AD compliance once after
updating the maintenance records, rather than recording compliance
after every inspection and part replacement.
Differences Between This Proposed AD and the MCAI
The MCAI applies to Viking Air Limited Model DHC-6 series 110, DHC-
6 series 210, DHC-6 series 310, and DHC-6 series 320, and this proposed
AD would not because these models do not have an FAA type certificate.
Transport Canada Models DHC-6 series 1, DHC-6 series 100, DHC-6 series
200, DHC-6 series 300, and DHC-6 series 400 airplanes correspond to FAA
Model DHC-6-1, DHC-6-100, DHC-6-200, DHC-6-300, and DHC-6-400
airplanes, respectively.
Costs of Compliance
The FAA estimates that this AD, if adopted as proposed, would
affect 33 airplanes of U.S. registry.
The FAA also estimates that it would take about 1 work-hour per
airplane to incorporate life limits, modification limits, and
inspection or overhaul intervals, into maintenance records. The average
labor rate is $85 per work-hour.
Based on these figures, the FAA estimates the cost of the proposed
AD on U.S. operators to be $2,805 or $85 per airplane.
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:
0
a. Removing Airworthiness Directive 80-13-10, Amendment 39-3812 (45 FR
43155, June 26, 1980); Airworthiness Directive 80-13-12 R1, Amendment
39-4135 (46 FR 31251, June 15, 1981); and Airworthiness Directive 2008-
03-01, Amendment 39-15350 (73 FR 5729, January 31, 2008); and
0
b. Adding the following new airworthiness directive:
Viking Air Limited (Type Certificate Previously Held by Bombardier,
Inc., de
[[Page 61722]]
Havilland, Inc.): Docket No. FAA-2021-0960; Project Identifier 2019-
CE-021-AD.
(a) Comments Due Date
The FAA must receive comments on this airworthiness directive
(AD) by December 23, 2021.
(b) Affected ADs
This AD replaces the ADs specified in paragraphs (b)(1) through
(3) of this AD.
(1) AD 80-13-10, Amendment 39-3812 (45 FR 43155, June 26, 1980).
(2) AD 80-13-12 R1, Amendment 39-4135 (46 FR 31251, June 15,
1981).
(3) AD 2008-03-01 Amendment 39-15350 (73 FR 5729, January 31,
2008).
(c) Applicability
This AD applies to Viking Air Limited (type certificate
previously held by Bombardier, Inc., de Havilland, Inc.) Model DHC-
6-1, DHC-6-100, DHC-6-200, DHC-6-300, and DHC-6-400 airplanes, all
serial numbers, certificated in any category.
(d) Subject
Joint Aircraft System Component (JASC) Code 0500, Time Limits.
(e) Unsafe Condition
This AD was prompted by mandatory continuing airworthiness
information (MCAI) originated by an aviation authority of another
country to identify and address an unsafe condition on an aviation
product. The MCAI identifies the unsafe condition as failure to
comply with new and more restrictive airworthiness limitations,
including tasks where range-based requirements have been changed to
specific hours time-in-service (TIS) and flight cycle limits. The
FAA is issuing this AD to prevent loss of structural integrity of
certain parts. The unsafe condition, if not addressed, could result
in loss of control of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Maintenance and Life Limits
(1) Within 30 days after the effective date of this AD,
incorporate into the maintenance records required by 14 CFR
91.417(a)(2) or 135.439(a)(2) for your airplane the life limits,
modification limits, and inspection or overhaul intervals in DHC-6
Twin Otter PSM 1-6-11, Airframe Airworthiness Limitations Manual,
Revision 9, dated April 30, 2018 (PSM 1-6-11 Rev9).
(2) Before further flight after revising the maintenance records
as required by paragraph (g)(1) of this AD, except as allowed under
paragraph (h) of this AD, remove from service each part that has
reached or exceeded its life limit and modify each part that has
reached or exceeded its modification limit.
(3) Before further flight after revising the maintenance records
as required by paragraph (g)(1) of this AD, except as allowed under
paragraph (h) of this AD, inspect or overhaul each part that has
reached or exceeded its inspection or overhaul interval.
(h) Phase-In Period
The following phase-in periods are allowed to comply with the
initial tasks in PSM 1-6-11 Rev9.
(1) Task 27-007: For any pulley that has been in service for 48
or more months on the effective date of this AD, replace the pulley
within 12 months after the effective date of this AD.
(2) Tasks 32-001 and 32-002:
(i) For any main landing gear (MLG) leg that, on the effective
date of this AD, has not been marked with a new serial number as
specified in Viking DHC-6 Twin Otter Technical Bulletin V6/00063:
Within 6 months after the effective date of this AD, inspect and
serialize the MLG leg. The absence of a serial number indicates that
the initial inspection of the landing gear leg has not previously
been accomplished.
(ii) For all other MLG legs, overhaul the MLG leg within 60
months after the last overhaul.
(3) Tasks 57-006, 57-007, 57-010, 57-011, 57-013, and 57-014:
(i) For any wing that on the effective date of this AD has
accumulated more than 16,000 hours total TIS or 32,000 total flight
cycles but less than 17,000 hours total TIS or less than 34,000
total flight cycles, accomplish the task within 1,000 hours TIS or
2,000 flight cycles, whichever occurs first after the effective date
of this AD.
(ii) For any wing that on the effective date of this AD has
accumulated 17,000 or more hours total TIS or 34,000 or more total
flight cycles, accomplish the task before accumulating 18,000 hours
total TIS or 36,000 total flight cycles, or within 60 months after
the effective date of this AD, whichever occurs first.
(4) Tasks 57-018, 57-019, 57-022, 57-023, 57-026, 57-027, 57-
030, and 57-031:
(i) For any wing that on the effective date of this AD has
accumulated more than 11,000 hours total TIS or 22,000 total flight
cycles but less than 12,000 hours total TIS or less than 24,000
total flight cycles, accomplish the task within 1,000 hours TIS or
2,000 flight cycles, whichever occurs first after the effective date
of this AD.
(ii) For any wing that on the effective date of this AD has
accumulated 12,000 or more hours total TIS or 24,000 or more total
flight cycles, accomplish the task before accumulating 13,000 hours
total TIS or 26,000 total flight cycles or within 60 months after
the effective date of this AD, whichever occurs first.
(5) Tasks 57-039 to 57-041 inclusive: For any wing that on the
effective date of this AD has more than 20 years since the date of
manufacture and has not previously been inspected in accordance with
Viking Service Bulletin V6/0018, inspect the wing upper surface
within 120 days after the effective date of this AD.
(i) No Alternative Actions or Intervals
After the maintenance records have been revised as required by
paragraph (g) of this AD, no alternative actions (e.g., inspections)
or intervals may be used unless the actions or intervals are
approved as an alternative method of compliance (AMOC) in accordance
with the procedures specified in paragraph (j)(1) of this AD.
(j) Alternative Methods of Compliance (AMOCs)
(1) 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 ACO Branch, send it to the attention of the person
identified in paragraph (k)(1) of this AD.
(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.
(k) Related Information
(1) For more information about this AD, contact Aziz Ahmed,
Aviation Safety Engineer, New York ACO Branch, FAA,1600 Stewart
Avenue, Suite 410, Westbury, NY 11590; phone: (516) 228-7329; fax:
(516) 794-5531; email: <a href="/cdn-cgi/l/email-protection#31504b584b1f50595c5455715750501f565e47"><span class="__cf_email__" data-cfemail="45243f2c3f6b242d282021052324246b222a33">[email protected]</span></a>.
(2) Refer to Transport Canada AD CF-2019-02, dated January 9,
2019, for more information. You may examine the Transport Canada AD
in the AD docket at <a href="https://www.regulations.gov">https://www.regulations.gov</a> by searching for and
locating it in Docket No. FAA-2021-0960.
(3) For service information identified in this AD, contact
Viking Air Limited Technical Support, 1959 De Havilland Way, Sidney,
British Columbia, Canada, V8L 5V5; phone: (North America) (800) 663-
8444; fax: (250) 656-0673; email: <a href="/cdn-cgi/l/email-protection#6c18090f0402050f0d00421f191c1c031e182c1a050705020b0d051e420f0301"><span class="__cf_email__" data-cfemail="473322242f292e24262b693432373728353307312e2c2e2920262e356924282a">[email protected]</span></a>;
website: <a href="https://www.vikingair.com/support/service-bulletins">https://www.vikingair.com/support/service-bulletins</a>. You
may view this service information at the Airworthiness Products
Section, Operational Safety Branch, FAA, 901 Locust, Kansas City, MO
64106. For information on the availability of this material at the
FAA, call (816) 329-4148.
Issued on November 1, 2021.
Lance T. Gant,
Director, Compliance & Airworthiness Division, Aircraft Certification
Service.
[FR Doc. 2021-24102 Filed 11-5-21; 8:45 am]
BILLING CODE 4910-13-P
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