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Airworthiness Directive

AD 2013-20-18 78 FR 63858 Active

Federal Aviation Administration · 14 CFR part 39

Prompted by fatigue analysis that shows the retirement life should be reduced on certain yokes.

Federal Register (opens in a new tab)

FR document
2013-24961
Amendment
39-17624
Published
2013-10-25
Effective
2013-11-29
Models covered
1

Last live check: 2026-10-04

Printed from https://aircraftdirectives.com/ad/2013-20-18 · 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

2013-20-18

FR doc 2013-24961 · 78 FR 63858

AD 2013-20-18Published 2013-10-25Effective 2013-11-29

Supersedes 2009-05-09

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.

Prompted by fatigue analysis that shows the retirement life should be reduced on certain yokes.

Full official abstract

We are superseding Airworthiness Directive (AD) 2009-05-09 for Bell Model 412, 412CF, and 412EP helicopters. AD 2009-05-09 required reidentifying each affected part-numbered main rotor yoke (yoke) on its data plate, reducing the retirement life of the reidentified yoke, and revising the Airworthiness Limitations section of the maintenance manual or the Instructions for Continued Airworthiness (ICAs) accordingly. This new AD retains the requirements of AD 2009-05-09 with the exception of the P/N marking location. This AD was prompted by fatigue analysis that shows the retirement life should be reduced on certain yokes. We are issuing this AD to correct the unsafe condition on these helicopters.

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All Bell 412 directives

View on Federal Register (opens in a new tab) Search DRS manually for AD 2013-20-18 (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