Airworthiness Directive 77-05-02
one-timeAD 77-05-02 · 1977-01-01 · airframe
Airworthiness Directives; certain main rotor blades having possible corrosion or fretting in the blade weight bolt holes or other defects in the spar, accom
Which aircraft AD 77-05-02 applies to
MakesCertain Main Rotor Blades Having Possible Corrosion Or Fretting In Blade Weight Bolt Holes Or Other Defects In Spar Accomplish Following For Main Rotor Blades P N 204-012 ' Time In Service This Ad Does Not Apply To Blades P N 204-012-001-33 (Bell
Models212
Whether AD 77-05-02 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 77-05-02 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.