Is AD 2021-11088 a recurring Airworthiness Directive?

No — AD 2021-11088 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2021-11088

Q: Which aircraft does AD 2021-11088 apply to?

AD 2021-11088 applies to De Havilland Aircraft Of Canada Limited — models DHC-8-401, DHC-8-402, DHC-8. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 2021-11088 · 2021-05-27 · airframe

Airworthiness Directives; De Havilland Aircraft of Canada Limited (Type Certificate Previously Held by Bombardier, Inc.) Airplanes

What this AD requires

The FAA is superseding Airworthiness Directive (AD) 2015-17- 08, which applied to certain Bombardier, Inc. Model DHC-8-400 series airplanes. AD 2015-17-08 required installing new cable assemblies with a pull-down resistor. This AD requires modifications to the nose wheel steering (NWS) system. This AD was prompted by a report indicating that several failure modes of the NWS system may cause the loss of feedback from both rotary variable differential transformers to the steering control unit. The FAA is issuing this AD to address the unsafe condition on these products.

Which aircraft AD 2021-11088 applies to

MakesDe Havilland Aircraft Of Canada Limited

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

Serial-conditional — narrows to serials 4001–4001, 4003–4608.

Whether AD 2021-11088 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 2021-11088 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.