Is AD 98-19-04 a recurring Airworthiness Directive?

No — AD 98-19-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-19-04 apply to?

AD 98-19-04 applies to Agusta — models A109C, A109E, A109K2, A109. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-19-04

one-time

Official AD 98-19-04 · FR doc 99-3589 · 1999-02-16 · airframe

Airworthiness Directives; Agusta S.p.A. Model A109C, A109E, and A109K2 Helicopters

What this AD requires

This document publishes in the Federal Register an amendment adopting Airworthiness Directive (AD) AD 98-19-04, which was sent previously to all known U.S. owners and operators of Agusta S.p.A. Model A109C, A109E, and A109K2 helicopters by individual letters. This AD requires conducting a tapping inspection of the upperside and lowerside of the main rotor blade (blade) blade tip cap for debonding between the metal shells and honeycomb core; conducting a visual inspection of the upperside and lowerside of the blade tip cap for swelling or deformation between the metal shells and the honeycomb core; and visually inspecting the welded bead along the leading edge of the blade tip cap for cracks. This amendment is prompted by two discoveries of cracks in the leading edge of the blade tip cap of a blade. The actions specified by this AD are intended to prevent blade blade tip cap failure and subsequent loss of control of the helicopter.

Which aircraft AD 98-19-04 applies to

MakesAgusta

ModelsA109C, A109E, A109K2, A109

Part-conditional — 709-0103-29-109.

Repetitive inspection (every 25 hours TIS) of main rotor blade tip caps (tap test, visual, and 8x-magnifier weld-bead check for debonding, swelling, or cracks); replace the blade if a defect exceeding limits is found. A replacement blade with airworthy tip cap P/N 709-0103-29-109 is terminating action for that blade. References Agusta Bollettino Tecnico 109-106, 109EP-1 Rev A, and 109K-22, applicable to Model A109C, A109E, and A109K2 respectively.

Whether AD 98-19-04 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 98-19-04 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.