Is AD 2021-16-20 a recurring Airworthiness Directive?

No — AD 2021-16-20 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-16-20 apply to?

AD 2021-16-20 applies to Pzl Swidnik S.A. — models PZL W-3A, W-3. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-16-20

one-time

Official AD 2021-16-20 · FR doc 2021-17025 · 2021-08-11 · airframe

Airworthiness Directives; PZL Swidnik S.A. Helicopters

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain PZL Swidnik S.A. Model PZL W-3A helicopters. This AD requires visually inspecting the bonding on a certain part-numbered fairing installed on a certain part-numbered vibration absorber, improving the bonding if necessary, using improved installation procedures to secure the fairing to the vibration absorber, and removing certain parts from service. This AD also prohibits installing the affected part unless it is inspected and installed per the AD requirements. This AD was prompted by a report of a broken bolt securing the fairing to the vibration absorber that resulted from an incorrect torque value for the nut used to secure the fairing to the vibration absorber. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-16-20 applies to

MakesPzl Swidnik S.A.

ModelsPZL W-3A, W-3

Part-conditional — 30.23.015.00.03, 30.23.000.00.04.

Applies only to helicopters with fairing P/N 30.23.015.00.03 installed on vibration absorber P/N 30.23.000.00.04.

Whether AD 2021-16-20 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 2021-16-20 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.