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Airworthiness Directive 98-11-15

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Official AD 98-11-15 · FR doc 99-1351 · 1999-01-26 · airframe

Airworthiness Directives; Bell Helicopter Textron, Inc. Model 212 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) 98-11-15, which was sent previously to all known U.S. owners and operators of Bell Helicopter Textron, Inc. (BHTI) Model 212 helicopters by individual letters. This AD requires inspecting the trunnion assembly or tail rotor flapping stop (flapping stop), whichever is applicable, installing a trunnion assembly or flapping stop, if necessary; and replacing the tail rotor yoke (yoke). This amendment is prompted by an accident involving a BHTI Model 205A-1 helicopter in which the yoke failed during flight. This condition, if not corrected, could lead to failure of the yoke, loss of the tail rotor, and subsequent loss of control of the helicopter.

Which aircraft AD 98-11-15 applies to

MakesBell
Part-conditional — 212-011-702, 212-011-713-103, 212-010-704, 212-010-744, 212-010-738-001.

Tail rotor yoke failure prevention: review incident history; within 180 days replace the yoke assembly with a zero-time unit or one that passed an X-ray diffraction inspection per Bell ASB 212-96-100 Rev A or ASB 212-96-101; install flapping stop P/N 212-011-713-103 (for P/N 212-011-702 yokes) or trunnion assembly P/N 212-010-738-001 (for P/N 212-010-704 or 212-010-744 yokes); recurring 25-hour TIS trunnion inspections thereafter. Part-number/ASB prefixes suggest Model 212 but no literal 'Model' designation appears in the extracted applicability text.

Whether AD 98-11-15 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

How AD compliance is recorded

A valid compliance record (14 CFR 43.9) states:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 98-11-15 complied with on your aircraft?

Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.

Look up a tail number →Read the full directive (Federal Register)

Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.