Airworthiness Directive 81-18-04 R2
one-timeAD 81-18-04 R2 · 1981-01-01 · reciprocating engine
Airworthiness Directives; SUBJECT HEADING: AVCO LYCOMING: All O-235, O-290-D, -D2, O-320, IO-320, AIO-320, AEIO-320, LIO-320, O-340, O-360, IO-360, AIO-360,
Which aircraft AD 81-18-04 R2 applies to
MakesSubject Heading Avco Lycoming All O-235 O-290-D -D2 O-320 Io-320 Aio-320 Aeio-320 Lio-320 O-340 O-360 Io-360 Aio-360 Aeio-360 Ho-360 Hio-360 Lo-360 Lio-360 Tio-360 To Regulatory Text 81-18-04 R2 Avco Lycoming Amendment 39-4199 As Amended By Amendment 39-4258 Is Further Amended By Amendment 39-4395 Applicability All O-235 O-290-D -D2 O-320 Io-320 -P2A O-235-P2C O-235-P3C O-290-D O-290-D2 O-290-D2A O-290-D2B O-290-D2C O-320-A1A O-320-A1B O-320-A2A O-320-A2B O-320-A2C O-320-A2D O-320-A3A O-320-A3B O-320-A3C O-320-B1A O-320-B1B O
ModelsO-235, O-290-D, O-320, IO-320, AEIO-320, LIO-320, O-340, O-360, IO-360, AEIO-360, HO-360, HIO-360, LO-360, LIO-360, TIO-360, O-235-P2C, O-235-P3C, O-290-D2, O-290-D2A, O-290-D2B, O-290-D2C, O-320-A1A, O-320-A1B, O-320-A2A, O-320-A2B, O-320-A2C, O-320-A2D, O-320-A3A, O-320-A3B, O-320-A3C, O-320-B1A, O-320-B1B
Whether AD 81-18-04 R2 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 81-18-04 R2 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.