Is AD 2006-12-07 a recurring Airworthiness Directive?

No — AD 2006-12-07 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 2006-12-07

Q: Which aircraft does AD 2006-12-07 apply to?

AD 2006-12-07 applies to Lycoming Engines — models O-320-A1B, O-320-A2B, O-320-A2C, O-320-A2D, O-320-A3A, O-320-A3B, O-320-B2B, O-320-B2C. Serial/part conditions may narrow it to specific aircraft.

one-time

Official AD 2006-12-07 · FR doc 06-5127 · 2006-06-06 · reciprocating engine

Airworthiness Directives; Engine Components Inc. (ECi) Reciprocating Engine Cylinder Assemblies

What this AD requires

The FAA is superseding an existing airworthiness directive (AD) for Lycoming Engines (formerly Textron Lycoming) models 320, 360, and 540 series, "Parallel Valve" reciprocating engines, with certain Engine Components Inc. (ECi) cylinder assemblies, part number (P/N) AEL65102 series "Classic Cast", installed. That AD currently requires replacing these ECi cylinder assemblies. This AD requires the same actions, but replaces the "Engine Models" Table 1 and "Engines Installed On, But Not Limited To" Table 2 with corrected tables. Also, this AD corrects the casting part number. This AD results from reports of applicability errors found in AD 2005-26-10. We are issuing this AD to prevent loss of engine power due to cracks in the cylinder assemblies and possible engine failure caused by separation of a cylinder head.

Which aircraft AD 2006-12-07 applies to

MakesLycoming Engines

ModelsO-320-A1B, O-320-A2B, O-320-A2C, O-320-A2D, O-320-A3A, O-320-A3B, O-320-B2B, O-320-B2C, O-320-B2D, O-320-B2E, O-320-B3B, O-320-B3C, O-320-C2B, O-320-C2C, O-320-C3B, O-320-C3C, O-320-D1A, O-320-D1AD, O-320-D1B, O-320-D1C, O-320-D1D, O-320-D1F, O-320-D2A, O-320-D2B, O-320-D2C, O-320-D2F, O-320-D2G, O-320-D2H, O-320-D2J, O-320-D3G, O-320-E1A, O-320-E1B, O-320-E1C, O-320-E1F, O-320-E1J, O-320-E2A, O-320-E2B, O-320-E2C, O-320-E2D, O-320-E2E, O-320-E2F, O-320-E2G, O-320-E2H, O-320-E3D, O-320-E3H, O-320-A1A, O-320-A2A, O-320-A3C, O-320-B1A, O-320-B1B, O-320-B2A, O-320-B3A, O-320-C1A, O-320-C1B, O-320-C2A, O-320-C3A, IO-320-A1A, IO-320-A2A, IO-320-B1A, IO-320-B1B, IO-320-B1C, IO-320-B1D, IO-320-B1E, IO-320-B2A, IO-320-D1A, IO-320-D1AD, IO-320-D1B, IO-320-D1C, IO-320-E1A, IO-320-E1B, IO-320-E2A, IO-320-E2B, IO-320-C1A, IO-320-C1B, IO-320-C1F, IO-320-F1A, AEIO-320-D1B, AEIO-320-D2B, AEIO-320-E1A, AEIO-320-E1B, AEIO-320-E2A, AEIO-320-E2B, AIO-320-A1A, AIO-320-A1B, AIO-320-A2A, AIO-320-A2B, AIO-320-B1B, AIO-320-C1B, LIO-320-B1A, LIO-320-C1A, O-360-A1A, O-360-A1C, O-360-A1D, O-360-A2A, O-360-A2E, O-360-A3A, O-360-A3D, O-360-A4A, O-360-B1A, O-360-B1B, O-360-B2A, O-360-B2B, O-360-C1A, O-360-C1C, O-360-C1G, O-360-C2A, O-360-C2B, O-360-C2C, O-360-C2D, O-360-D1A, O-360-D2A, O-360-D2B, IO-360-B1A, IO-360-B1B, IO-360-B1C, O-320, IO-320, AEIO-320, AIO-320, LIO-320, O-360, IO-360

Serial-conditional — narrows to serials 1–9879.

Part-conditional — AEL65102-NST04, AEL65102-NST05, AEL65102-NST06, AEL65102-NST07, AEL65102-NST08, AEL65102-NST10.

Applies only to engines with ECi cylinder assemblies P/N AEL65102 series 'Classic Cast' (head casting markings EC 65099-REV-1), serial numbers 1 through 9879 (may carry an 'L' prefix for long-reach spark plug), sold January 1997 to September 2001, installed. The applicability intro also states the AD covers Lycoming 320, 360, and 540 series parallel-valve reciprocating engines generally; the source excerpt's Table 1 is truncated before fully listing 540-series and HO-360 model rows.

Whether AD 2006-12-07 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 2006-12-07 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.