AircraftDirectives
MembershipSign inCreate free account
Menu
Airworthiness Directive

AD 98-07-03 63 FR 14026 Active

Federal Aviation Administration · 14 CFR part 39

Requires a temporary reduction of the never-exceed velocity (Vne) limitation until an inspection of the tail rotor yoke (yoke) assembly for fatigue damage and installation of a redesigned yoke flapping stop are accomplished.

Federal Register (opens in a new tab)

FR document
98-7414
Amendment
39-10421
Published
1998-03-24
Effective
1998-04-08
Models covered
1

Last live check: 2026-10-04

Printed from https://aircraftdirectives.com/ad/98-07-03 · 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.

Opens your browser's print dialog. Choose “Save as PDF” to export a file. Keyboard: Ctrl+P or Cmd+P.

AD

98-07-03

FR doc 98-7414 · 63 FR 14026

AD 98-07-03Published 1998-03-24Effective 1998-04-08

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 a temporary reduction of the never-exceed velocity (Vne) limitation until an inspection of the tail rotor yoke (yoke) assembly for fatigue damage and installation of a redesigned yoke flapping stop are accomplished.

1 correction to this AD FAA · 1998-07-20

Correction published 1998-07-20

Issued by
Federal Aviation Administration
Published
1998-07-20
Document
Federal Register 98-19178 · Final rule; correction
Corrects
the version published March 24, 1998 at 63 FR 14026

This document corrects a technical bulletin date in airworthiness directive (AD) 98-07-03 that was incorrectly published in the Federal Register on March 24, 1998 (63 FR 14026). This AD is applicable to Bell Helicopter Textron, Inc. Model 412 helicopters and Agusta S.p.A Model AB 412 helicopters and requires a temporary reduction of the never-exceed velocity (Vne) limitation until an inspection of the tail rotor yoke (yoke) assembly for fatigue damage and installation of a redesigned yoke flapping stop are accomplished. Recurring periodic and special inspections to detect occurrences of yoke overload are also required.

A correction restates part of an AD that was published incorrectly. It is not an additional requirement and it does not change the AD number or its effective date.

Source: Federal Register document 98-19178, retrieved 2026-09-21

Read this correction on Federal Register (opens in a new tab)
Full official abstract

This amendment adopts a new airworthiness directive (AD) that is applicable to Bell Helicopter Textron, Inc. (Bell) Model 412 helicopters and Agusta S.p.A. (Agusta) Model AB412 helicopters. This action requires a temporary reduction of the never-exceed velocity (Vne) limitation until an inspection of the tail rotor yoke (yoke) assembly for fatigue damage and installation of a redesigned yoke flapping stop are accomplished. Recurring periodic and special inspections to detect occurrences of yoke overload are also required. This amendment is prompted by laboratory tests and engineering analyses that indicated that the yoke assembly is susceptible to fatigue damage due to unforeseen static and dynamic loading of the tail rotor against the original flapping stop. The actions specified in this AD are intended to prevent fatigue failure of the yoke that could result in loss of control of the tail rotor and subsequent loss of control of the helicopter.

More directives for Bell 412

  1. AD 2024-16-19 Airworthiness Directives; Bell Textron Inc. Helicopters Effective 2024-11-08
  2. AD 2024-16-01 Airworthiness Directives; Bell Textron Inc. (Type Certificate Previously... Effective 2024-09-04
  3. AD 2022-20-14 Airworthiness Directives; Bell Textron Inc., Helicopters and Various Res... Effective 2022-12-27
  4. AD 2022-22-12 Airworthiness Directives; Bell Textron Inc., Erickson 214 Holdings, LLC,... Effective 2022-11-22
  5. AD 2022-11-19 Airworthiness Directives; Bell Textron Inc. Helicopters Effective 2022-07-06

All Bell 412 directives

View on Federal Register (opens in a new tab) Search DRS manually for AD 98-07-03 (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