Is AD 2023-21-09 a recurring Airworthiness Directive?

No — AD 2023-21-09 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2023-21-09 apply to?

AD 2023-21-09 applies to Boeing — models 777-200, 777-200LR, 777-300, 777-300ER, 777F, 777. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2023-21-09

one-time

Official AD 2023-21-09 · FR doc 2023-25046 · 2023-11-13 · 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 777-200, 777-200LR, 777-300, 777-300ER, and 777F series airplanes. This AD was prompted by a report of a "FLAPS DRIVE" caution message in flight due to the torque trip indicator of the No. 2 trailing edge (TE) flap transmission assembly being in the set position, which resulted in an air turn-back. This AD requires an inspection or records review to determine the serial numbers of the TE flap transmission and gearbox assemblies, and applicable on-condition corrective actions. This AD also limits the installation of affected parts. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2023-21-09 applies to

MakesBoeing

Models777-200, 777-200LR, 777-300, 777-300ER, 777F, 777

Whether AD 2023-21-09 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 2023-21-09 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.