Is AD 99-26-13 a recurring Airworthiness Directive?

No — AD 99-26-13 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-26-13 apply to?

AD 99-26-13 applies to Agusta. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-26-13

one-time

Official AD 99-26-13 · FR doc 99-32580 · 1999-12-20 · airframe

Airworthiness Directives; Agusta S.p.A. Model A109A and A109A II Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to Agusta Model A109A and A109A II helicopters, that currently requires inspecting each tail rotor blade (blade) for a crack and replacing any cracked blade. This amendment requires, before further flight, inspecting any blade with 400 or more hours time-in- service (TIS) for a crack and replacing any cracked blade. This amendment is prompted by another report of a cracked blade since the issuance of the existing AD. Two of the three occurrences of cracked blades involved the loss of the tail rotor and 90-degree gearbox. The actions specified by this AD are intended to prevent fatigue failure of the blade, loss of the tail rotor, and subsequent loss of control of the helicopter.

Which aircraft AD 99-26-13 applies to

MakesAgusta

Dye-penetrant and visual (3-5x magnification) inspection of rotor blade for cracks per Agusta S.p.A. Bollettino Tecnico 109-110 (same technical bulletin cited in AD 00-17); replace cracked blade with an airworthy blade. Bulletin numbering suggests Agusta A109 but the model is not explicitly named in this excerpt; specific model list is in a preceding applicability section not captured here.

Whether AD 99-26-13 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 99-26-13 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.