Is AD 2014-15-20 a recurring Airworthiness Directive?

No — AD 2014-15-20 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2014-15-20 apply to?

AD 2014-15-20 applies to Bombardier, Inc. — models DHC-8-400, DHC-8-401, DHC-8-402, DHC-8. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2014-15-20

one-time

Official AD 2014-15-20 · FR doc 2014-18306 · 2014-08-15 · airframe

Airworthiness Directives; Bombardier, Inc. Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Bombardier, Inc. Model DHC-8-400 series airplanes. This AD was prompted by reports of failure of the high pressure shutoff valves (HPSOVs) causing the timer and monitor unit (TMU) to become inoperative since the HPSOV and the TMU are on the same circuit breaker. This AD requires a wiring modification to segregate the HPSOV power supply from the TMU. We are issuing this AD to prevent an inoperative TMU, which could result in the loss of the automatic de-icing mode, and lead to an increased workload for the flight crew and loss of control of the airplane.

Which aircraft AD 2014-15-20 applies to

MakesBombardier, Inc.

ModelsDHC-8-400, DHC-8-401, DHC-8-402, DHC-8

Serial-conditional — narrows to serials 4001–4446.

Whether AD 2014-15-20 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 2014-15-20 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.