Is AD 2017-21-09 a recurring Airworthiness Directive?

Yes — AD 2017-21-09 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Airworthiness Directive 2017-21-09

Q: Which aircraft does AD 2017-21-09 apply to?

AD 2017-21-09 applies to Embraer — models ERJ 170-100 LR, ERJ 170-100 STD, ERJ 170-100 SE, ERJ 170-100 SU, ERJ 170-200 LR, ERJ 170-200 SU, ERJ 170-200 STD, ERJ 190-100 STD. Serial/part conditions may narrow it to specific aircraft.

recurring

Official AD 2017-21-09 · FR doc 2017-22779 · 2017-10-23 · airframe

Airworthiness Directives; Embraer S.A. Airplanes

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Embraer S.A. Model ERJ 170 airplanes and Model ERJ 190-100 STD, -100 LR, -100 IGW, -200 STD, -200 LR, and -200 IGW airplanes. This AD was prompted by an evaluation by the design approval holder indicating that the forward pressure bulkhead is subject to widespread fatigue damage. This AD requires repetitive detailed inspections of the web aft face of the forward pressure bulkhead for any cracking and discrepancy, and repair if necessary. This AD also requires modification of the forward pressure bulkhead, which would terminate the inspections. We are issuing this AD to address the unsafe condition on these products.

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 2017-21-09 applies to

MakesEmbraer

ModelsERJ 170-100 LR, ERJ 170-100 STD, ERJ 170-100 SE, ERJ 170-100 SU, ERJ 170-200 LR, ERJ 170-200 SU, ERJ 170-200 STD, ERJ 190-100 STD, ERJ 190-100 LR, ERJ 190-100 IGW, ERJ 190-200 STD, ERJ 190-200 LR, ERJ 190-200 IGW, ERJ 170, ERJ 190

Applies to airplanes identified in Embraer Service Bulletin 170-53-0051, Revision 03, dated August 21, 2013 (ERJ 170 models), and Embraer Service Bulletin 190-53-0019, Revision 03, dated August 21, 2013 (ERJ 190 models).

Whether AD 2017-21-09 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 2017-21-09 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.