2002-23-06: Crankshaft gear retaining bolts
FAA order 2002-23-06 is an airworthiness directive in force since November 19, 2002. The FAA's subject line: Crankshaft gear retaining bolts. It names the Lycoming AEIO-540-D4A5, Lycoming AEIO-540-D4B5, Lycoming AEIO-540-L1B5, Lycoming AEIO-540-L1B5D, Lycoming AEIO-540 series, Lycoming IO-540 series, Lycoming LTIO-540-F2BD, Lycoming LTIO-540-J2BD, Lycoming O-540 series, Lycoming TIO-540-A1A, Lycoming TIO-540-A2B, Lycoming TIO-540-A2C, Lycoming TIO-540-AA1AD, Lycoming TIO-540-AB1BD, Lycoming TIO-540-AE2A, Lycoming TIO-540-AF1A, Lycoming TIO-540-AF1B, Lycoming TIO-540-AG1A, Lycoming TIO-540-AH1A, Lycoming TIO-540-AK1A, Lycoming TIO-540-C1A, Lycoming TIO-540-F2BD, Lycoming TIO-540-J2B, Lycoming TIO-540-J2BD, Lycoming TIO-540-K1AD, Lycoming TIO-540-R2AD, Lycoming TIO-540-S1AD, Lycoming TIO-540 series, Lycoming TIO-540-U2A, Lycoming TIO-540-V2AD engines: about 16,324 aircraft on the U.S. register today across them, though an order usually covers particular versions or serial numbers rather than every one. System: engine.
What it applies to as the FAA lists it
- Kind of product
- Engine
- Makes
- Textron Lycoming, AVCO Corporation; Lycoming Engines
- Models
- AEIO-540, AEIO-540-D4A5, AEIO-540-D4B5, AEIO-540-D4C5, AEIO-540-D4D5, AEIO-540-L1B5, AEIO-540-L1B5D, AEIO-540-L1D5, IO-540 Series (all), LTIO-540-F2BD, LTIO-540-J2B, LTIO-540-J2BD, LTIO-540-K1AD, LTIO-540-N2BD, LTIO-540-R2AD, LTIO-540-U2A, LTIO-540-V2AD, LTIO-540-W2A, O-540 Series (all), TIO-540-A1A, TIO-540-A1B, TIO-540-A1C, TIO-540-A2A, TIO-540-A2B, TIO-540-A2C, TIO-540-AA1AD, TIO-540-AB1AD, TIO-540-AB1BD, TIO-540-AE2A, TIO-540-AF1A, TIO-540-AF1B, TIO-540-AG1A, TIO-540-AH1A, TIO-540-AK1A, TIO-540-C1A, TIO-540-E1A, TIO-540-F2BD, TIO-540-G1A, TIO-540-H1A, TIO-540-J2B, TIO-540-J2BD,...
- Engine series
- Lycoming AEIO-540-D4A5 57 aircraft
Lycoming AEIO-540-D4B5 3 aircraft
Lycoming AEIO-540-L1B5 56 aircraft
Lycoming AEIO-540-L1B5D 41 aircraft
Lycoming AEIO-540 series 434 aircraft
Lycoming IO-540 series 4,222 aircraft
Lycoming LTIO-540-F2BD 1 aircraft
Lycoming LTIO-540-J2BD 5 aircraft
Lycoming O-540 series 5,245 aircraft
Lycoming TIO-540-A1A 5 aircraft
Lycoming TIO-540-A2B 4 aircraft
Lycoming TIO-540-A2C 6 aircraft
Lycoming TIO-540-AA1AD 2 aircraft
Lycoming TIO-540-AB1BD 1 aircraft
Lycoming TIO-540-AE2A 488 aircraft
Lycoming TIO-540-AF1A 3 aircraft
Lycoming TIO-540-AF1B 15 aircraft
Lycoming TIO-540-AG1A 1 aircraft
Lycoming TIO-540-AH1A 89 aircraft
Lycoming TIO-540-AK1A 508 aircraft
Lycoming TIO-540-C1A 10 aircraft
Lycoming TIO-540-F2BD 4 aircraft
Lycoming TIO-540-J2B 6 aircraft
Lycoming TIO-540-J2BD 24 aircraft
Lycoming TIO-540-K1AD 1 aircraft
Lycoming TIO-540-R2AD 1 aircraft
Lycoming TIO-540-S1AD 13 aircraft
Lycoming TIO-540 series 5,074 aircraft
Lycoming TIO-540-U2A 3 aircraft
Lycoming TIO-540-V2AD 2 aircraft
Dates and paperwork
- In force since
- November 19, 2002
- Published
- November 14, 2002 (signed November 8, 2002)
- Docket
- 2002-NE-31-AD
- Replaces
- 2002-20-51
- Replaced by
- 2004-05-24
- Status
- Historical
- The FAA's document
- Read the order on the FAA's site
The FAA's summary their words, unchanged
This amendment supersedes an emergency airworthiness directive (AD) that was sent previously to all known U.S. owners and operators of Textron Lycoming (T/L) 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 still requires replacing certain zinc-plated crankshaft gear retaining bolts, but expands the population of affected engines. This amendment is prompted by two recent failures of zinc-plated crankshaft gear retaining bolts, and a reassessment of the extent to which the suspect bolts may still be present in the field. The actions specified by this AD are intended to prevent loss of all engine power and possible forced landing.
The order itself the regulatory text, as published
Show the full text (7,951 characters)
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/2002-23-06.json · aircraft systems.
