Is AD 2021-15-04 a recurring Airworthiness Directive?

No — AD 2021-15-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-15-04 apply to?

AD 2021-15-04 applies to The Boeing Company — models 767-300, 767. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-15-04

one-time

Official AD 2021-15-04 · FR doc 2021-15026 · 2021-07-14 · 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 767-300 series airplanes as modified by a certain supplemental type certificate (STC). This AD was prompted by a report that the electrical diagram for the C9066 circuit breaker connection (wiring) for the "Main Deck Oxygen Alert Control" is erroneous and might have resulted in incorrect installation. This AD requires inspecting the wiring connection common to the C9066 circuit breaker and, if necessary, making changes to the wiring connection and testing the main deck oxygen alert system. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-15-04 applies to

MakesThe Boeing Company

Models767-300, 767

Applies only to Model 767-300 series airplanes modified to a Bedek Division Special Freighter (BDSF) configuration (designated 767-300BDSF) in accordance with FAA Supplemental Type Certificate ST02040SE, and listed in paragraph 1.A., 'Effectivity,' of IAI-Aviation Group Alert Service Bulletin 368-24-098, Revision 1, dated June 2021.

Whether AD 2021-15-04 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 2021-15-04 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.