Is AD 2020-26-04 a recurring Airworthiness Directive?

Yes — AD 2020-26-04 requires a repetitive inspection. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2020-26-04 apply to?

AD 2020-26-04 applies to Boeing — models 737-100, 737-200, 737-200C, 737-300, 737-400, 737-500, 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2020-26-04

recurring

Official AD 2020-26-04 · FR doc 2020-28029 · 2020-12-21 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is superseding Airworthiness Directive (AD) 2013-18- 08, which applied to certain The Boeing Company Model 737-200, -200C, - 300, -400, and -500 series airplanes. AD 2013-18-08 required repetitive inspections for cracking of certain skin panels of the fuselage, and of the fuselage skin along certain chem-milled lines, and corrective actions if necessary. AD 2013-18-08 also included a terminating action for the repetitive inspections of certain areas. This AD retains those actions, expands the nondestructive inspection (NDI) area, and adds airplanes to the applicability. This AD was prompted by reports of additional cracking in certain horizontal and vertical chem-milled step locations outside of those identified in AD 2013-18-08. The FAA is 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 2020-26-04 applies to

MakesBoeing

Models737-100, 737-200, 737-200C, 737-300, 737-400, 737-500, 737

Applicability defined per Boeing Alert Service Bulletin 737-53A1346, dated March 27, 2020; installation of STC ST01219SE does not exempt affected airplanes, which use a change-in-product-model alternative method of compliance.

Whether AD 2020-26-04 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 2020-26-04 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.