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Airworthiness Directive

AD 2020-04-21 85 FR 14786 Active

Federal Aviation Administration · 14 CFR part 39

Requires inspecting a certain part-numbered curvic coupling for proper engagement and depending on the inspection results, inspecting for play, inspecting the curvic coupling teeth, inspecting the flapping bearing teeth…

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FR document
2020-05244
Amendment
39-19862
Published
2020-03-16
Effective
2020-03-31
Models covered
1

Last live check: 2026-10-04

Printed from https://aircraftdirectives.com/ad/2020-04-21 · 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

2020-04-21

FR doc 2020-05244 · 85 FR 14786

AD 2020-04-21Published 2020-03-16Effective 2020-03-31

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 inspecting a certain part-numbered curvic coupling for proper engagement and depending on the inspection results, inspecting for play, inspecting the curvic coupling teeth, inspecting the flapping bearing teeth, replacing parts, performing a rigging check, and reporting information.

Full official abstract

The FAA is adopting a new airworthiness directive (AD) for certain Bell Helicopter Textron Canada Limited (Bell Canada) Model 429 helicopters. This AD requires inspecting a certain part-numbered curvic coupling for proper engagement and depending on the inspection results, inspecting for play, inspecting the curvic coupling teeth, inspecting the flapping bearing teeth, replacing parts, performing a rigging check, and reporting information. This AD was prompted by a report of disengaged teeth of a curvic coupling due to improper installation. The actions of this AD are intended to address an unsafe condition on these products.

More directives for Bell 429

  1. AD 2026-06-02 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2026-04-24
  2. AD 2024-07-51 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2024-06-10
  3. AD 2022-20-11 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2022-11-28
  4. AD 2022-09-07 Airworthiness Directives; Bell Textron Canada Limited (Type Certificate ... Effective 2022-05-31
  5. AD 2022-08-11 Airworthiness Directives; Bell Textron Canada Limited Helicopters Effective 2022-05-27

All Bell 429 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