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Federal Register / Vol. 86, No. 213 / Monday, November 8, 2021 / Proposed Rules
Havilland, Inc.: Docket No. FAA2021
0960; Project Identifier 2019CE021
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 b1 through 3 of this AD.
1 AD 801310, Amendment 393812 45
FR 43155, June 26, 1980.
2 AD 801312 R1, Amendment 394135
46 FR 31251, June 15, 1981.
3 AD 20080301 Amendment 3915350
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 DHC61, DHC6100, DHC6200, DHC6
300, and DHC6400 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.

lotter on DSK11XQN23PROD with PROPOSALS1

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 91.417a2 or 135.439a2 for your airplane the life limits, modification limits, and inspection or overhaul intervals in DHC6 Twin Otter PSM
1611, Airframe Airworthiness Limitations Manual, Revision 9, dated April 30, 2018
PSM 1611 Rev9.
2 Before further flight after revising the maintenance records as required by paragraph g1 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 g1 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.

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h Phase-In Period The following phase-in periods are allowed to comply with the initial tasks in PSM 1
611 Rev9.
1 Task 27007: 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 32001 and 32002:
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 DHC6 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 57006, 57007, 57010, 57011, 57013, and 57014:
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 57018, 57019, 57022, 57023, 57026, 57027, 57030, and 57031:
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 57039 to 57041 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 j1 of this AD.

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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 k1 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 2287329; fax: 516
7945531; email: aziz.ahmed@faa.gov.
2 Refer to Transport Canada AD CF
201902, dated January 9, 2019, for more information. You may examine the Transport Canada AD in the AD docket at https
www.regulations.gov by searching for and locating it in Docket No. FAA20210960.
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 6638444; fax:
250 6560673; email: technical.support@
vikingair.com; website: https
www.vikingair.com/support/service-bulletins.
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 3294148.
Issued on November 1, 2021.
Lance T. Gant, Director, Compliance & Airworthiness Division, Aircraft Certification Service.
FR Doc. 202124102 Filed 11521; 8:45 am BILLING CODE 491013P

DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration 14 CFR Part 71
Docket No. FAA20210919; Airspace Docket No. 21ASO32
RIN 2120AA66

Proposed Amendment of United States Area Navigation RNAV Route T215;
Central United States Federal Aviation Administration FAA, DOT.
ACTION: Notice of proposed rulemaking NPRM.
AGENCY:

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