Is AD 2015-20-10 a recurring Airworthiness Directive?

No — AD 2015-20-10 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2015-20-10 apply to?

AD 2015-20-10 applies to Gulfstream Aerospace Corporation — models GVI. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2015-20-10

one-time

Official AD 2015-20-10 · FR doc 2015-25495 · 2015-10-09 · airframe

Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for all Gulfstream Aerospace Corporation Model GVI airplanes. This AD was prompted by reports of corrosion on in-service air non-return valves. This AD requires a revision to the Emergency Procedures section of the airplane flight manual (AFM). This AD also requires a revision to the maintenance or inspection program, as applicable, to incorporate airworthiness limitations for the high pressure (HP) Stage 5 air non- return valves. We are issuing this AD to ensure the flightcrew is provided with procedures to mitigate the risks associated with failure of the HP Stage 5 air non-return valve. Failure of the HP Stage 5 air non-return valve in the open position could result in engine instability and uncommanded in-flight shutdown.

Which aircraft AD 2015-20-10 applies to

MakesGulfstream Aerospace Corporation

ModelsGVI

Model GVI is also referred to by marketing designations G650 and G650ER.

Whether AD 2015-20-10 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 2015-20-10 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.