Is AD 2019-23-04 a recurring Airworthiness Directive?

No — AD 2019-23-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2019-23-04 apply to?

AD 2019-23-04 applies to The Boeing Company — models 727, 727-100, 727C, 727-100C, 727-200, 727-200F. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2019-23-04

one-time

Official AD 2019-23-04 · FR doc 2019-27885 · 2019-12-31 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 727 airplanes. This AD was prompted by the FAA's analysis of the Model 727 fuel system review conducted by the manufacturer. This AD requires modifying the fuel quantity indicating system (FQIS) to prevent development of an ignition source inside the body-mounted auxiliary fuel tanks due to electrical fault conditions. As an alternative to the modification, this AD allows deactivating the body-mounted auxiliary fuel tanks. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2019-23-04 applies to

MakesThe Boeing Company

Models727, 727-100, 727C, 727-100C, 727-200, 727-200F

Applies only to airplanes equipped with Boeing body-mounted auxiliary fuel tanks.

Whether AD 2019-23-04 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 2019-23-04 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.