Is AD 74-18-05 a recurring Airworthiness Directive?

No — AD 74-18-05 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 74-18-05 apply to?

AD 74-18-05 applies to Slick — models 662, 680, 664, 667, 668, 676, 447. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 74-18-05

one-time

AD 74-18-05 · 1974-01-01 · appliance

Airworthiness Directives; 3080608 and below must have the old impulse couplings replaced with new couplings listed below: Slick Magneto Models - 662 and 680

Which aircraft AD 74-18-05 applies to

MakesSlick

Models662, 680, 664, 667, 668, 676, 447

Serial-conditional — narrows to serials ?–3080608.

Part-conditional — M-2369, M-2370, M-2371, M-2372, M-2373, M-2374.

Magnetos with serial numbers 3080608 and below must have old impulse couplings replaced with the listed new couplings, per model (ref. Slick Service Letter 1-73).

Whether AD 74-18-05 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 74-18-05 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.