Is AD 2021-12-11 a recurring Airworthiness Directive?

No — AD 2021-12-11 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2021-12-11 apply to?

AD 2021-12-11 applies to The Boeing Company — models 767-200, 767-300, 767-300F, 767-400ER, 767. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-12-11

one-time

Official AD 2021-12-11 · FR doc 2021-13097 · 2021-06-24 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is superseding Airworthiness Directive (AD) 2016-25- 29, which applied to certain The Boeing Company Model 767-200 and -300 series airplanes. AD 2016-25-29 required replacing the cargo compartment insulation blankets on the left and right sides with new insulation blankets that incorporate fire stops. This AD was prompted by a report of a fire in the bilge area of the cargo compartment that burned through the insulation blankets that were intended to prevent smoke from migrating behind the cargo compartment sidewall liners and upward into the main cabin. This AD continues to require the actions in AD 2016-25-29 for certain airplanes. This AD also adds airplanes to the applicability and requires a general visual inspection of the replacement insulation blankets to determine if the blankets are in serviceable condition and correctly installed, and applicable on- condition actions. For certain airplanes, this AD also requires an inspection to determine the insulation blanket part number installed; replacement of additional insulation blankets; and applicable on- condition actions. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-12-11 applies to

MakesThe Boeing Company

Models767-200, 767-300, 767-300F, 767-400ER, 767

Airplanes as identified in Boeing Special Attention Service Bulletin 767-25-0550, Revision 1, dated December 4, 2019.

Whether AD 2021-12-11 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 2021-12-11 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.