Is AD 2018-17-01 a recurring Airworthiness Directive?

No — AD 2018-17-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2018-17-01 apply to?

AD 2018-17-01 applies to Bell — models 212, 412, 412CF, 412EP. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2018-17-01

one-time

Official AD 2018-17-01 · FR doc 2018-17905 · 2018-08-21 · airframe

Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters

What this AD requires

We are superseding Airworthiness Directive (AD) 2017-15-02 for Bell Model 212 and 412 helicopters. AD 2017-15-02 required replacing certain oil and fuel check valves and prohibited installing them on any helicopter. This AD retains the requirements of AD 2017-15-02 and adds certain model helicopters to the applicability. This AD was prompted by the discovery of an error in the affected models. We are issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2018-17-01 applies to

MakesBell

Models212, 412, 412CF, 412EP

Part-conditional — 209-062-520-001, 209-062-607-001.

Applies only to helicopters with an engine oil check valve P/N 209-062-520-001 or fuel check valve P/N 209-062-607-001, manufactured by Circor Aerospace and marked 'Circle Seal', with a manufacturing date code of 10/11 (October 2011) through 03/15 (March 2015) installed; excludes valves marked 'TQL' next to the manufacturing date code.

Whether AD 2018-17-01 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 2018-17-01 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.