Is AD 2016-21-02 a recurring Airworthiness Directive?

No — AD 2016-21-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2016-21-02 apply to?

AD 2016-21-02 applies to Sikorsky Aircraft Corporation — models S-92A, S-92. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2016-21-02

one-time

Official AD 2016-21-02 · FR doc 2016-24738 · 2016-10-18 · airframe

Airworthiness Directives; Sikorsky Aircraft Corporation Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-92A helicopters. This AD requires altering the fire bottle inertia switch wiring and performing a cartridge functional test of the fire extinguishing system. This AD was prompted by the inadvertent tripping of inertia-switches that has led to unintentional discharging of the fire bottles, leaving the helicopter's auxiliary power unit and engines without fire protection. The actions are intended to prevent unintentional and undetected fire bottle discharges and subsequent unavailability of fire suppression in case of a fire.

Which aircraft AD 2016-21-02 applies to

MakesSikorsky Aircraft Corporation

ModelsS-92A, S-92

Serial-conditional — narrows to serials 920006–920250.

Whether AD 2016-21-02 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 2016-21-02 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.