Is AD 98-1705 a recurring Airworthiness Directive?

No — AD 98-1705 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 98-1705 apply to?

AD 98-1705 applies to Textron Lycoming — models O-320, O-360. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 98-1705

one-time

AD 98-1705 · 1998-01-28 · reciprocating engine

Airworthiness Directives; Certain Textron Lycoming 320 and 360 Series Reciprocating Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to certain Textron Lycoming 320 and 360 series reciprocating engines, that requires visual inspections of the inside diameter (ID) of the crankshaft for corrosion pits, and if corrosion pits are found during this inspection, prior to further flight, performing a magnetic particle inspection (MPI) or fluorescent penetrant inspection (FPI) of the ID for cracks. In addition, this AD requires reporting findings of inspections to the FAA. Finally, terminating action to the inspections of this AD is the application of a preventive treatment coating on non- corroded crankshafts to prevent corrosion. This amendment is prompted by reports of cracks in crankshafts originating from corrosion pits in the ID. The actions specified by this AD are intended to prevent crankshaft failure, which can result in engine failure, propeller separation, forced landing, and possible damage to the aircraft.

Which aircraft AD 98-1705 applies to

MakesTextron Lycoming

ModelsO-320, O-360

Applies to Lycoming 320-series engines limited to 160 hp, and 360-series four-cylinder engines with fixed-pitch propellers, EXCLUDING: HO-360, HIO-360, LHIO-360, VO-360, and IVO-360 series (helicopter-installed or solid-crankshaft variants); Models O-320-B2C, O-360-J2A, AEIO-360-B4A, O-360-A4A, -A4G, -A4J, -A4K, -A4M, and -C4F; and any engine with a crankshaft stamped 'PID' on the outside diameter of the propeller flange (exempt from inspection).

Whether AD 98-1705 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 98-1705 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 →Read the full directive (Federal Register)

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.