Is AD 2019-25-12 a recurring Airworthiness Directive?

No — AD 2019-25-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2019-25-12 apply to?

AD 2019-25-12 applies to The Boeing Company — models 777-200, 777-300ER, 777. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2019-25-12

one-time

Official AD 2019-25-12 · FR doc 2019-28464 · 2020-01-06 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is superseding Airworthiness Directive (AD) 2016-18- 02, which applied to certain The Boeing Company Model 777-200 and - 300ER series airplanes. AD 2016-18-02 required replacing the low- pressure oxygen flex hoses with new non-conductive low-pressure oxygen flex hoses in the gaseous passenger oxygen system in airplanes equipped with therapeutic oxygen. This AD retains those actions and adds actions for certain airplanes. AD 2016-18-02 was prompted by the determination that the low-pressure oxygen flex hoses in the gaseous passenger oxygen system can potentially be conductive. This AD was further prompted by the determination that the associated service information is inadequate for certain airplanes. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2019-25-12 applies to

MakesThe Boeing Company

Models777-200, 777-300ER, 777

Applies to airplanes identified in Boeing Special Attention Service Bulletin 777-35-0041, Revision 1, dated August 14, 2019.

Whether AD 2019-25-12 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 2019-25-12 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.