Is AD 2021-08-10 a recurring Airworthiness Directive?

Yes — AD 2021-08-10 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2021-08-10 apply to?

AD 2021-08-10 applies to Boeing — models DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F, KC-10A, KDC-10, DC-10-40. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-08-10

recurring

Official AD 2021-08-10 · FR doc 2021-08055 · 2021-04-20 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company Model DC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC- 10-30F (KC-10A and KDC-10), DC-10-40 and DC-10-40F airplanes; and Model MD-10-10F and MD-10-30F airplanes. This AD was prompted by a report that an operator found a crack in the upper flange of the pylon aft bulkhead bracket. This AD requires a general visual inspection of the left and right wing pylon at the aft bulkhead bracket for any lockbolt and collar; repetitive surface and open hole eddy current high frequency (ETHF) inspections of the left and right wing pylon at the aft bulkhead bracket for any cracking; and applicable on-condition actions. The FAA is issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2021-08-10 applies to

MakesBoeing

ModelsDC-10-10, DC-10-10F, DC-10-15, DC-10-30, DC-10-30F, KC-10A, KDC-10, DC-10-40, DC-10-40F, MD-10-10F, MD-10-30F, DC-10, MD-10

KC-10A and KDC-10 are the military/other designations of the DC-10-30 and DC-10-30F models.

Whether AD 2021-08-10 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 2021-08-10 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.