Is AD 2016-25-21 a recurring Airworthiness Directive?

No — AD 2016-25-21 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2016-25-21 apply to?

AD 2016-25-21 applies to Boeing — models 787-8, 787. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2016-25-21

one-time

Official AD 2016-25-21 · FR doc 2016-30032 · 2016-12-22 · airframe

Airworthiness Directives The Boeing Company Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain The Boeing Company Model 787-8 airplanes. This AD was prompted by reports of electrical shorts of the motor stator wiring burning a hole through the housing of the motor of the cabin air compressor (CAC). This AD requires installing modified inboard and outboard CAC modules on the left-hand (LH) side and right-hand (RH) side cabin air conditioning and temperature control system (CACTCS) packs. We are issuing this AD to prevent the unsafe condition on these products.

Which aircraft AD 2016-25-21 applies to

MakesBoeing

Models787-8, 787

Applies to airplanes identified in Boeing Alert Service Bulletin B787-81205-SB210055-00, Issue 001, dated March 12, 2015.

Whether AD 2016-25-21 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 2016-25-21 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.