Is AD 2004-05-24 a recurring Airworthiness Directive?

No — AD 2004-05-24 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2004-05-24 apply to?

AD 2004-05-24 applies to Lycoming — models AEIO-540, IO-540, LTIO-540, O-540, TIO-540. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-05-24

one-time

Official AD 2004-05-24 · FR doc 04-5262 · 2004-03-15 · reciprocating engine

Airworthiness Directives; Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines. That action requires replacing certain zinc-plated crankshaft gear retaining bolts. This action retains that requirement, but expands the population of affected engines. In addition, this AD adds five additional kits for replacing the crankshaft gear retaining bolts. This AD results from notification from the Manufacturer of 161 engines not identified in the previous AD. This AD also results from approval of the five additional kits as alternative methods of compliance with AD 2002-23-06. We are issuing this AD to prevent loss of all engine power and possible forced landing.

Which aircraft AD 2004-05-24 applies to

MakesLycoming

ModelsAEIO-540, IO-540, LTIO-540, O-540, TIO-540

Part-conditional — STD-2209.

Applies to all Lycoming AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines with crankshaft gear retaining bolt P/N STD-2209 installed, EXCEPT: (1) O-540-F series engines subject to AD 99-03-05 where the bolt has not been subsequently replaced; (2) engines where the bolt was installed during original assembly or replaced by Lycoming per SB 554 after November 10, 1998; (3) engines with bolt P/N STD-2209 supplied as part of bolt replacement kit 05K19987, 05K23325, 05K23326, 05K23327, 05K23335, or 05K23336; (4) engines with single-drive dual magnetos.

Whether AD 2004-05-24 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 2004-05-24 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.