Is AD 2019-21-04 a recurring Airworthiness Directive?

No — AD 2019-21-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2019-21-04 apply to?

AD 2019-21-04 applies to Saab — models SAAB 2000. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2019-21-04

one-time

Official AD 2019-21-04 · FR doc 2019-24161 · 2019-11-06 · airframe

Airworthiness Directives; Saab AB, Saab Aeronautics (Formerly Known as Saab AB, Saab Aerosystems) Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain Saab AB, Saab Aeronautics Model SAAB 2000 airplanes. This AD was prompted by reports of loose and irregular fasteners at the forward end of the nacelle upper longeron, where the bulkhead frame and struts are attached to the engine mounting structure (EMS). This AD requires modification of the EMS and structural attachments. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2019-21-04 applies to

MakesSaab

ModelsSAAB 2000

Applies to all serial numbers except 006, 043, 056, and 061.

Whether AD 2019-21-04 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 2019-21-04 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.