Kelly Aero Overhauled Bendix Magneto S4Ln-21

+$300 Core Exchange Charge
Part# 10-51360-26
MFR Model# 10-51360-26R


This Bendix magneto is a specific type of aircraft magneto manufactured by Kelly Aero. There are multiple models of Bendix magnetos, and they can be infinitely overhauled. As a result, the Bendix magneto is more often overhauled than bought new, allowing for efficient, cost-effective use.
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WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.


exactly as expected. It does have the same gears as my original. Has a nice paint job, which looks like it will hold up better than the previous unit. Not much more $$ than a local 500-hour inspection.

Kevin A
August 24, 2019

Great support from kelly. No issues with the mags but would have preferred to see phenolic distributor gear than plastic. Seems to me this was a slick problem. Little notes in the box from bench tests etc. A nice touch . One minor issue was some corrosion on the inside of the distributor recess tells me that the core was not completely cleaned. Could have done a better job on a $650 mag.

Scott M
September 26, 2018

Purchased this overhauled mag (in combination with its non-impulse equal). Following the Lycoming procedure and have not been able to get this mag to time. Will try again and then contact MFG. Also, the P-Lead was located on the side. The no-impulse mag and both previous mags had P-Leads on end of mag. The side mounted P-Lead is very close to the oil filter. The product photo suggested this mag would also have P-Lead on end. Its not clear why the delivered mag was different.

Susan F
July 28, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Do these Kelly overhauled Bendix magnetos (S4LN-21) include the impulse coupling?

Yes, it does include the impulse coupling.

Q: This mag is P/N 10-51360-26. Will it replace a 10-51360-29 and 10-51360-37? Not sure what the last two digits on the P/N mean.

Per Kelly: P/N# 10-513690-26 was superseded by 10-51360-37. This will not replace 10-51360-29. The end numbers are just part of the unit number.

Q: Do you accept 4300 series slick mags as cores for this bendix magneto?

No. They cannot accept that core for this magneto.

Q: Do these mags come with overhaul paperwork?

Yes, this will come with paperwork.

Q: Do these mags come with a mag gasket?

The gasket is not included with this mag.