Is AD 2014-28325 a recurring Airworthiness Directive?

Yes — AD 2014-28325 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2014-28325 apply to?

AD 2014-28325 applies to Dowty Propellers — models R408/6-123-F/17, R408/6-123-F. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2014-28325

recurring

AD 2014-28325 · 2014-12-02 · propeller

Airworthiness Directives; Dowty Propellers Constant Speed Propellers

What this AD requires

We are revising airworthiness directive (AD) 2010-17-11R1, which applies to all Dowty Propellers R408/6-123-F/17 model propellers. AD 2010-17-11R1 required initial application of sealant between the bus bar assembly and the backplate assembly of certain line-replaceable units (LRUs) and repetitive re-applications of sealant on all R408/6- 123-F/17 model propellers. AD 2010-17-11R1 also provided an optional terminating action to the repetitive re-application of sealant. This AD increases the interval allowed between the required re-application of sealant, and specifies an additional acceptable sealant. This AD was prompted by failure of the propeller de-ice bus bar due to friction or contact between the bus bar and the backplate assembly, consequent intermittent short circuit, and possible double generator failure. We are issuing this AD to prevent an in-flight double generator failure, which could result in reduced control of the airplane.

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 2014-28325 applies to

MakesDowty Propellers

ModelsR408/6-123-F/17, R408/6-123-F

Serial-conditional — narrows to serials ?–DAP0927.

Applies to propellers with a hub, actuator, and backplate assembly line-replaceable unit (LRU) S/N below DAP0927.

Whether AD 2014-28325 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 2014-28325 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.