Is AD 2017-09-11 a recurring Airworthiness Directive?

Yes — AD 2017-09-11 requires a repetitive inspection every 600 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2017-09-11 apply to?

AD 2017-09-11 applies to Bombardier — models DHC-8-400, DHC-8-401, DHC-8-402, DHC-8. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2017-09-11

recurring

Official AD 2017-09-11 · FR doc 2017-10339 · 2017-05-25 · 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 interruptions in the airstair door operation. This AD requires repetitive inspections and modification of the handrail hardware. We are issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect every 600 hours. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2017-09-11 applies to

MakesBombardier

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

Serial-conditional — narrows to serials 4001–4473.

Part-conditional — ModSum 4-422100, ModSum 4-458687.

Applies only to airplanes equipped with Bombardier ModSum 4-422100 or ModSum 4-458687 (Jetway Compatible Passenger Airstair Door).

Whether AD 2017-09-11 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 2017-09-11 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.