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Airworthiness Directive

AD 2021-25-12 86 FR 72174 Superseded

Federal Aviation Administration · 14 CFR part 39

Requires repetitive lubrications of the trailing arm of the NLG.

Superseded by AD 2024-12-05Federal Register (opens in a new tab)

FR document
2021-27709
Amendment
39-21856
Published
2021-12-21
Effective
2022-01-05
Models covered
1

Last live check: 2026-10-04

Printed from https://aircraftdirectives.com/ad/2021-25-12 · AircraftDirectives restates official FAA and manufacturer records; the official sources named on this sheet control. Not an airworthiness determination.

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AD

2021-25-12

FR doc 2021-27709 · 86 FR 72174

AD 2021-25-12Published 2021-12-21Effective 2022-01-05

Superseded by 2024-12-05 Supersedes 2017-19-09

Supersedence is read from the Federal Register text of the newer AD — the FAA publishes no structured field for it — and names only ADs held in our index.

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 repetitive lubrications of the trailing arm of the NLG.

Full official abstract

The FAA is superseding Airworthiness Directive (AD) 2017-19- 09, which applied to certain De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Model DHC-8-400 series airplanes. AD 2017-19-09 required modifying the nose landing gear (NLG) shock strut assembly. This new AD requires repetitive lubrications of the trailing arm of the NLG. This new AD also requires revising the existing maintenance or inspection program to include new and revised airworthiness limitations (life limits for certain bolts). This AD was prompted by reports of a certain bolt being found missing or having stress corrosion cracking. The FAA is issuing this AD to address the unsafe condition on these products.

More directives for de Havilland DHC-8 Dash 8

  1. AD 2026-11-06 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type ... Effective 2026-07-09
  2. AD 2026-08-07 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type ... Effective 2026-06-03
  3. AD 2025-19-05 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type ... Effective 2025-10-31
  4. AD 2025-05-06 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type ... Effective 2025-04-16
  5. AD 2024-22-07 Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type ... Effective 2024-12-31

All de Havilland DHC-8 Dash 8 directives

View on Federal Register (opens in a new tab) Search DRS manually for AD 2021-25-12 (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