Is AD 2021-01-07 a recurring Airworthiness Directive?

Yes — AD 2021-01-07 requires a repetitive inspection every 9000 hours. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2021-01-07 apply to?

AD 2021-01-07 applies to Boeing — models 737-700, 737. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2021-01-07

recurring

Official AD 2021-01-07 · FR doc 2021-01823 · 2021-02-22 · airframe

Airworthiness Directives; The Boeing Company Airplanes

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for certain The Boeing Company Model 737-700 series airplanes. This AD requires repetitive testing to verify correct operation of the smoke clearance mode of the equipment cooling system and low pressure environmental control system, and corrective actions if necessary. This AD also requires installing new relays and changing the wiring to the environmental control system, among other actions. This AD was prompted by a determination that a repetitive test is needed to assess the components on airplanes equipped with a certain air distribution system configuration. The FAA is issuing this AD to address the unsafe condition on these products.

Repetitive inspection. Re-inspect every 9000 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 2021-01-07 applies to

MakesBoeing

Models737-700, 737

Applies only to airplanes with line numbers (L/Ns) 481, 545, 684, 979, 1089, 1211, and 1223.

Whether AD 2021-01-07 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 2021-01-07 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.