2002-20-51: Crankshaft gear retaining bolts
Emergency order 2002-20-51 is an airworthiness directive. The FAA's subject line: Crankshaft gear retaining bolts. It names the 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 16,167 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, 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, TIO-540-K1AD, TIO-540-N2BD, TIO-540-R2AD, TIO-540-S1AD, TIO-540-T2AD, TIO-540-U2A, TIO-540-V2AD, TIO-540-W2A
- Engine series
- 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
- Docket
- 2002-NE-31-AD
- Replaced by
- 2002-23-06
- Status
- Historical
- The FAA's document
- Read the order on the FAA's site
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/2002-20-51.json · aircraft systems.