Is AD 66-20-03 a recurring Airworthiness Directive?

No — AD 66-20-03 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 66-20-03 apply to?

AD 66-20-03 applies to Hawker Siddeley Aviation Limited — models Heron (114), Heron. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 66-20-03

one-time

AD 66-20-03 · 1966-01-01 · appliance

Airworthiness Directives; 0.25 inch diameter radial holes with jet, P/N P.117, with 0.25 inch diameter radial holes. (Hawker Siddeley Aviation Limited Techn

Which aircraft AD 66-20-03 applies to

MakesHawker Siddeley Aviation Limited

ModelsHeron (114), Heron

Part-conditional — P.117.

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

Whether AD 66-20-03 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 66-20-03 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.