Airworthiness Directive 89-23-12
one-timeAD 89-23-12 · 1989-01-01 · turbine engine
Airworthiness Directives; CONTACT: SUPPLEMENTARY INFORMATION: REGULATORY TEXT: 89-23-12 ALLISON GAS TURBINE DIVISION, GENERAL MOTORS CORPORATION (Allison, f
Which aircraft AD 89-23-12 applies to
MakesContact Supplementary Information Regulatory Text 89-23-12 Allison Gas Turbine General Motors Amendment 39-6345 Motors Amendment 39-6345 Applicability Allison
Models250-C28B
Whether AD 89-23-12 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 89-23-12 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.