Is AD 2011-20-06 a recurring Airworthiness Directive?

No — AD 2011-20-06 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2011-20-06 apply to?

AD 2011-20-06 applies to Leonardo — models AB139, AW139. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2011-20-06

one-time

Official AD 2011-20-06 · FR doc 2011-27690 · 2011-10-27 · airframe

Airworthiness Directives; Agusta S.p.A. Model AB139 and AW139 Helicopters

What this AD requires

This amendment supersedes an existing airworthiness directive (AD) for Agusta S.p.A. (Agusta) Model AB139 and AW139 helicopters. This action retains the requirements in the existing AD and adds a daily check of the tailboom panels to detect bulging or deformation of the tailboom outer skin panels. If there is bulging or deformation, this AD requires a mechanic to do a tap inspection for debonding. If the debonded area exceeds a certain limit, this AD requires modifying the tailboom. Also, when an area of debond does not exceed the limits, this AD requires, before further flight, repairing the debonded area of the tailboom or replacing the tailboom. This action also adds a tap inspection for additional tailboom panels and requires the inspection on both sides of the tailboom. This amendment is prompted by the determination that more inspections are required and to limit the applicability only to those helicopters with tailboom assemblies that have not been modified. Modifying the tailboom assembly is terminating action for the requirements of this AD. The actions specified in this AD are intended to detect damage in the tailboom to prevent failure of a tailboom and subsequent loss of control of a helicopter.

Which aircraft AD 2011-20-06 applies to

MakesLeonardo

ModelsAB139, AW139

Part-conditional — 3G5350A00132, 3G5350A00133, 3G5350A00134, 3G5350A00135, 3G5309P01812.

Applies only to helicopters with a tail assembly P/N 3G5350A00132, 3G5350A00133, 3G5350A00134, or 3G5350A00135 installed, except those with tailboom reinforcement structural retro-modification (MOD) P/N 3G5309P01812 installed.

Whether AD 2011-20-06 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 2011-20-06 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.