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Airworthiness Directive

AD 2021-24-18 86 FR 71815 Active

Federal Aviation Administration · 14 CFR part 39

Requires determining service life limits for the wing strut fitting on the main spar and for the tie-bar and following instructions for removal and replacement of affected parts.

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FR document
2021-27409
Amendment
39-21839
Published
2021-12-20
Effective
2022-01-24
Models covered
1

Last live check: 2026-08-19

Printed from https://aircraftdirectives.com/ad/2021-24-18 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

This page is a reference Record, not an airworthiness or compliance determination. Official FAA and manufacturer sources control over our restatement, subject to governing law. Check applicability, current requirements and incorporated documents before acting. The owner or operator remains responsible for airworthiness and required records under 14 CFR 91.403 and 91.417, as applicable. Terms of Use: /terms.

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AD

2021-24-18

FR doc 2021-27409 · 86 FR 71815

AD 2021-24-18Published 2021-12-20Effective 2022-01-24

FAA rule - 14 CFR 39

FAA rule. Compliance with an applicable AD is required under 14 CFR 39.7. Check its effective date, applicability, compliance times and current status.

Requires determining service life limits for the wing strut fitting on the main spar and for the tie-bar and following instructions for removal and replacement of affected parts.

Full official abstract

The FAA is adopting a new airworthiness directive (AD) for all Viking Air Limited Model DHC-3 airplanes. This AD results from mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as fatigue damage of the wing strut lug fitting components and the fuselage to wing strut attachment (tie-bar). This AD requires determining service life limits for the wing strut fitting on the main spar and for the tie-bar and following instructions for removal and replacement of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.

More directives for de Havilland DHC-3 Otter

  1. AD 2025-17-08 Airworthiness Directives; Viking Air Limited (Type Certificate Previousl... Effective 2025-09-29
  2. AD 2023-22-17 Airworthiness Directives; Viking Air Limited (Type Certificate Previousl... Effective 2024-01-19
  3. AD 2023-18-03 Airworthiness Directives; Viking Air Limited (Type Certificated Previous... Effective 2023-10-24
  4. AD 2022-21-51 Airworthiness Directives; Viking Air Limited (Type Certificate Previousl... Effective 2022-12-01
  5. AD 2022-23-08 Airworthiness Directives; Viking Air Limited (Type Certificate Previousl... Effective 2022-11-02

All de Havilland DHC-3 Otter directives

View on Federal Register (opens in a new tab) View this AD in FAA DRS (opens in a new tab) Print AD packet (opens the full Federal Register document in a new tab)

Applies to 1 model in our index