Technical guide covering operation, adjustment, and maintenance of Bendix S-1200 and Slick 6300 aircraft magnetos.
This manual explains how the Bendix S-1200 and Slick 6300 magnetos generate high‑voltage sparks for general‑aviation engines, describing the primary and secondary coils, voltage levels, and spark‑plug gap requirements. It also details the internal adjustments such as point gap and E‑gap, and how to set engine timing correctly.
The document provides step‑by‑step procedures for inspecting and servicing the impulse coupling, flyweight pivot, and high‑voltage capacitor, and offers recommended inspection intervals (every 100 hours for plugs, every 500 hours for full overhaul). Practical troubleshooting tips are included for common failures like worn points or capacitor faults.
| Initial spark voltage | about 10 kV |
|---|---|
| Maximum spark voltage | up to 20 kV |
| Spark‑plug gap range | 0.016" – 0.021" |
| Point gap (Bendix mags) | ≈ 0.018 in |
| Impulse coupling lag angle (Slick on Continental) | 25° – 35° |
| Impulse coupling lag angle (Bendix) | 10° – 45° |
| Recommended plug inspection interval | every 100 hours |
The impulse coupling lag angle for Slick magnetos on Lycoming engines is typically 5°–20°.