Is AD 66-28-04 a recurring Airworthiness Directive?

No — AD 66-28-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 66-28-04 apply to?

AD 66-28-04 applies to Lockheed. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 66-28-04

one-time

AD 66-28-04 · 1966-01-01 · airframe

Airworthiness Directives; ) Visually inspect steering housing, P/N 800905-1, for hydraulic oil leaks. If a leak is indicated, inspect steering housing, P/N

Which aircraft AD 66-28-04 applies to

MakesLockheed

Part-conditional — 800905-1.

Visually inspect steering housing P/N 800905-1 for hydraulic oil leaks; if a leak is indicated, inspect/replace before further flight with a new steering housing per Sections 2.G-2.K of Lockheed Alert Service Bulletin 88/SB-576, Revision 1. Specific model not stated in excerpt.

Whether AD 66-28-04 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 66-28-04 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 →

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.