Is AD 98-24-15 a recurring Airworthiness Directive?

No — AD 98-24-15 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-24-15 apply to?

AD 98-24-15 applies to Bell — models 204B, 205A, 205A-1, 204, 205. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-24-15

one-time

Official AD 98-24-15 · FR doc 98-31195 · 1998-11-23 · airframe

Airworthiness Directives; Bell Helicopter Textron Model 204B, 205A, 205A-1, 205B, and 212 Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to Bell Helicopter Textron Model 204B, 205A, 205A-1, and 212 helicopters, that currently establishes a retirement life for the main rotor masts (masts) and main rotor trunnions (trunnions) based on time-in-service (TIS) and types of operations. This amendment adds Model 205B helicopters to the applicability; requires creation of component history cards or equivalent records using a Retirement Index Number (RIN) system; establishes a system for tracking increases to the accumulated RIN; and establishes a maximum accumulated RIN for certain masts and trunnions. This amendment is prompted by an accident involving a Model 205A-1 helicopter, in which a mast failure caused a separation of the main rotor from the helicopter. The actions specified by this AD are intended to prevent fatigue failure of the mast or trunnion and subsequent loss of control of the helicopter.

Which aircraft AD 98-24-15 applies to

MakesBell

Models204B, 205A, 205A-1, 204, 205

Part-conditional — 204-011-450-001, 204-011-450-007, 204-011-450-105, 204-011-105-001.

Main rotor mast (204-011-450-001 on Model 204B; -007/-105 on Model 205A/205A-1) and trunnion (204-011-105-001); establishes a Retirement Index Number (RIN) tracking external-load lifts and takeoffs, plus hard TIS/RIN retirement limits (e.g., 6,000 hrs/300,000 RIN for the -001 mast; 15,000 hrs/300,000 RIN for -007/-105 mast or trunnion).

Whether AD 98-24-15 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 98-24-15 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.