Airworthiness Directive 73-23-03
one-timeAirworthiness Directives; already accomplished. To preclude separation of the inner liner and possible blockage of carburetor induction air flexible ducts w
Which aircraft AD 73-23-03 applies to
To preclude separation of the inner liner and possible blockage of carburetor induction air flexible ducts (which may cause partial or complete engine power loss): within 100 hours after the effective date, inspect the ducts; single-wall ducts need no further action; double-wall ducts must be replaced prior to further flight.
Whether AD 73-23-03 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:
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.