Airworthiness Directive 86-21-01
one-timeAD 86-21-01 · 1986-01-01 · airframe
Airworthiness Directives; the effective date of this AD, replace the sleeves before they reach 2,000 hours' time in service. (c) For Model SA 365N and N-1 h
Which aircraft AD 86-21-01 applies to
MakesEffective Date Of This Ad Replace Sleeves Before They Reach 2 000 Hours' Time In Service For
ModelsN-1
Whether AD 86-21-01 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 86-21-01 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.