Is AD 2016-20-01 a recurring Airworthiness Directive?

No — AD 2016-20-01 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2016-20-01 apply to?

AD 2016-20-01 applies to Bell — models 427, 429. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2016-20-01

one-time

Official AD 2016-20-01 · FR doc 2016-23345 · 2016-09-30 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Bell Model 427 and Model 429 helicopters. This AD requires replacing certain engine and transmission oil check valves. This AD also prohibits installing the affected check valves on any helicopter. This AD is prompted by a report of several cracked or leaking check valves. These actions are intended to detect and prevent a cracked or leaking check valve which could result in loss of lubrication to the engine or transmission, failure of the engine or transmission, and subsequent loss of control of the helicopter.

Which aircraft AD 2016-20-01 applies to

MakesBell

Models427, 429

Part-conditional — 209-062-520-001.

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

Whether AD 2016-20-01 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 2016-20-01 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.