Is AD 90-23-19 a recurring Airworthiness Directive?

No — AD 90-23-19 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 90-23-19 apply to?

AD 90-23-19 applies to Pratt & Whitney — models JT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 90-23-19

one-time

AD 90-23-19 · 1990-01-01 · turbine engine

Airworthiness Directives; date of this AD, whichever occurs first, in accordance with the above noted SB. (d) For JT9D-7R4D/D1/E/E1(AI 500 series) model eng

Which aircraft AD 90-23-19 applies to

MakesPratt & Whitney

ModelsJT9D-7R4D, JT9D-7R4D1, JT9D-7R4E, JT9D-7R4E1, JT9D

applicability read from the AD teaser — confirm exact model/serial from the records

Whether AD 90-23-19 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 90-23-19 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 →

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.