Airpart Supply Ltd are an Authorised Distributor & Stockist for the Lycoming EIS
LYCOMING EIS
Lycoming's EIS meets the ever-growing performance requirements of modern-day aircraft design, including less maintenance, lower weight, and more spark control than a traditional magneto.
- The Lycoming EIS unit is a Lycoming proprietary design; it is engineered, tested and certified at the engine type certificate level
- Drop-in capable replacement for magnetos
- Service Instruction SI1070 is valid for certified engines, regardless of EIS installation, so there are no restrictions on fuel type (other than what is approved by engine model in SI1070).
- There are no maintenance intervals or inspections required, and the EIS unit matches the engine recommended TBO
- The Lycoming EIS does not require an STC for single installation
- The EIS eliminates the 500-hour inspection cost and, in single, fixed-timing installation allows for easier starting and smoother idle and better cold-start performance
Warranty: EIS units carry a 24-month (or TBO, wof) warranty as spares and on all Lycoming factory engines. An EIS installed as a warranty replacement is only warranted for the balance of the original engine or parts warranty period. On an overhauled engine, the EIS would be warranted for an additional 12-months beyond the overhauled engine 12-month warranty period.
Support Documents:
- Service Instruction SI1443R; approved EIS part numbers per engine model
- Service Instruction SI1569A; technical and installation details
Once you have located the apprived replacement EIS magneto (using Service Instruction SI1443R) - select the required part number from the table below for pricing and availability:
| Lycoming Part Number | Description | LED Code (S=Short Blink L=Long Blink) |
| 66K4A3SN-01 | 4 Cyl, Plain Drive, 20 Degree, Fixed Timing (Lyc Eis) | L-L-L-L |
| 66K4A3SN-02 | 4 Cyl, Plain Drive, 25 Degree, Fixed Timing (Lyc Eis) | L-L-L-S |
| 66K4F3SN-01 | 4 Cyl, Impulse Drive, 20 Degree, Fixed Timing (Lyc Eis) | L-L-L-L |
| 66K4F3SN-02 | 4 Cyl, Impulse Drive, 25 Degree, Fixed Timing (Lyc Eis) | L-L-L-S |
| 66K6D3SN-01 | 6 Cyl, 20 Degree, Fixed Timing (Lyc Eis) | L-L-L-L |
| 66K6D3SN-02 | 6 Cyl, 25 Degree, Fixed Timing (Lyc Eis) | L-L-L-S |
| 66K6D3SN-03 | 6 Cyl, 23 Degree, Fixed Timing (Lyc Eis) | L-L-S-L |
| 66K6D3SN-04 | 6 Cyl, 20 Degree, Fixed Timing, Rev Rot (Lyc Eis) | S-L-L-L |
More information can be found on the Lycoming Engines website here: https://www.lycoming.com/eis
