Is AD 2015-04-04 a recurring Airworthiness Directive?

No — AD 2015-04-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2015-04-04 apply to?

AD 2015-04-04 applies to Bell Helicopter Textron Canada — models 412EP, 412. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2015-04-04

one-time

Official AD 2015-04-04 · FR doc 2015-03585 · 2015-02-24 · airframe

Airworthiness Directives; Bell Helicopter Textron Inc. Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Bell Helicopter Textron Inc. (Bell) Model 412 and 412EP helicopters with certain static inverters (inverters) installed. This AD requires revising the Rotorcraft Flight Manual (RFM) and installing a placard in full view of the pilot to limit flight to visual flight rules (VFR) only and prohibit night operations. This AD is prompted by failures of certain inverters, most of which resulted in smoke in the cockpit. The actions specified by this AD are intended to restrict flight to VFR only and prohibit night operations to allow safe operation in the event of failure of an affected inverter. This failure would increase pilot workload during instrument flight rules (IFR) and could result in loss of certain pilot information displays and subsequent loss of control of the helicopter.

Which aircraft AD 2015-04-04 applies to

MakesBell Helicopter Textron Canada

Models412EP, 412

Part-conditional — 412-375-079-101, 412-375-079-103.

Applies only to helicopters with the specified static inverter part number, serial number 29145 or larger, installed.

Whether AD 2015-04-04 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 2015-04-04 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.