- Bendix Magneto Internal Timing Instructions
- Bendix Magneto Manual
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- Bendix Dual Magneto Manual
Quality Aircraft Accessories is the Source for CMI/Bendix Magneto Repair/Overhaul/Exchange. Whether you refer to them as Bendix magnetos, TCM Continental magnetos, or CMI/Bendix magnetos, Quality Aircraft Accessories (QAA) is a recognized market leader for aircraft magneto service, repair, and overhaul. The famous or infamous, as the case may be, Bendix dual mag (two magnetos in one case) is timed to the engine in a conceptually similar way as the following information, but has different technical checks to assure proper timing to the engine. See the appropriate Bendix manual for the specifics on this unique magneto. Top Dead Center.
CMI (formerly TCM/Bendix) magnetos and related equipment for CMI engines listed under “Models Affected” (above). Reference X42003, “D-2000/D-3000 Series Magneto Service Support Manual” for information on these systems. NOTE: This Service Document supersedes the recommended periodic magneto intervals and does not replace the recommended. BENDIX MAGNETO REPAIR OVERHAUL EXCHANGE WHETHER YOU REFER TO THEM AS BENDIX MAGNETOS TCM CONTINENTAL MAGNETOS OR CMI BENDIX MAGNETOS QUALITY AIRCRAFT ACCESSORIES QAA IS A RECOGNIZED MARKET LEADER FOR AIRCRAFT MAGNETO SERVICE REPAIR AND OVERHAUL' 'The Magneto Ignition System amazon com September 18th, 2013 - The Magneto Ignition System John.
John, I purchased and read your magneto book, which I found informative and interesting. After reading the book, I do have two questions I'm wondering if you could answer given your experience with magnetos.1. Our Cardinal has the dual magneto, although I am considering a conversion to a non-D at the upcoming overhaul. My question regards redundancy: what internal elements are common to the two magnetos within the D housing?
Do they only share a common drive shaft (and gear), or are any other electromechanical components shared - e.g., cam, magnets, etc.? Do you know of any source where I could see internal photos or mechanical or cutaway drawings of the D3000 magneto so I could better understand its design?
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Yes, the maintenance/overhaul manual for this magneto. About the only parts that are truly redundant is the coil, points, and capacitor.
The D3000 magneto is a good magneto, easy to work on and reliable. Like any device it has its limitations. Follow the maintenance/overhaul manual, service bulletins and airworthiness directives.
The following three areas should be well understood, respected and maintained, as all have caused fatal aircraft accidents:
- Impulse coupling spring (part number 10-51324)
- Hold-down clamps
- Cam retaining screw
Impulse Coupling Spring:Magneto Impulse coupling spring
Breakage retards timing causing complete loss of engine power. Cessna 172N N738BC ditched at sea with 2 fatalities. On any magneto the impulse area sometimes gets rusty from condensation. The impulse spring gets tiny rust pits that create stress corrosion cracking. There is no warning - it just breaks. With two magnetos you lose timing but you can turn the bad magneto off; with the D3000 magneto the broken spring retards the timing on both magnetos and you lose power.
Follow TCM's instructions and recommendations to the letter in regards to inspecting and replacing the impulse spring. Personally, if I lived in a corrosive area I would replace it every year.
Hold-down Clamps:
See my article at http://www.sacskyranch.com/eng410.htm
Cam Retaining Screw:'Everything hangs on this connection'
Here is a copy of an email I received some time ago from Germany:
A pilot came to an aircraft workshop with the problem,that the engine did not start well and did not reach more the 2200 RPM. (Cessna 170 N engine Lyc.O-320-H2AD SNR L-8408-76T)
the engine rpm drop was 120-130 rpm.-
The different pressure in the cylinders was 1.)80/78; 2.)80/79; 3.)80/78; 4.)80/77.-
The intake tube of the Cylinder No 3 was leaky -it was renewed.-
The timing of the ignitions examined and adjusted.-
The air intake filter was dirty and cleaned -
The following ground check did show no problems: rpm drop 70-80 rpm max rpm 2320 rpm.
Bendix Magneto Internal Timing Instructions
After this the aircraft made a take off and crashed immediately in the ground, as the engine lost power.
The investigation did show, that the screw (Fig 1-14 D-3000 Magneto manual ) was loose and so the cam breaker could turn on the cone. 
| Magneto cam retaining screw |
| D-2000, D-3000 points and cam |
Bendix Magneto Manual
The problem here is that the mechanic did not order a new cam screw and re-used the old one. You loosen this screw when you adjust internal timing. This screw is a self-locking screw that uses a nylon patch on the threads. The locking effectiveness is poor if re-used. Continental says to replace it with a new one. Follow the factory instructions - accept no deviation or alternative methods of compliance.
Continental (Bendix) has addressed each one of these areas in their maintenance manual. Personally, if the mechanic did not have the maintenance manual for the D3000 in hand I would not let him touch the magneto.
There is an interesting discussion of this screw and the problems associated with installing it that I highly recommend be read by anyone working on this magneto. http://www.aaib.dft.gov.uk/cms_resources/Mooney%20Aircraft%20Corporation%20M20J,%20G-EKMW%2011-06.pdf
Important information regarding distributor gears
FAA/PMA Approved Replacement Parts
From washers and cotter pins to distributor blocks and impluse couplings, Kelly Aerospace Energy Systems has the largest catalog of Bendix, CMI, and Slick aircraft magneto replacement parts in the world. Our parts are made to specifications dictated by Federal Aviation Administration parts manufacturing approvals. Our PMA process includes evaluating the OEM part for opportunities of improvement and incorporating those improvements while maintaining original form fit and function.
FAA/PMA Replacement Parts Repair Kit
Commonly used for minor repairs and 500 hour inspections. Kelly Aerospace magneto repair kits include contacts, capacitor, bearings, oil seal, oil slinger, woodruff keys, cotter pin, cam screw, felt washer, felt strip, snap ring and carbon brush.
Bendix Mag Overhaul Manual Pdf
Currently available for Bendix/CMI 20/200 series and Bendix/CMI 1200 series aircraft magnetos. Slick magneto repair kits are coming soon!
FAA/PMA Deluxe Replacement Parts Mag Repair Kit
Deluxe repair kits are often used for major repairs such as a aircraft magneto overhaul. Deluxe repair kits add a coil, distributor block and a distributor gear to the applicable standard repair kit. Please note that the deluxe repair kit may not contain all parts required for overhaul; refer to the appropriate overhaul manual for reference.
Currently available for Bendix/CMI 20 series, 200 series, and 1200 series aircraft magnetos. Slick magneto deluxe repair kits coming soon!
Bendix Mag Manual
Approved for the following piston-powered aircraft engine manufactures:
- Franklin Engines100%100%
- Continental Motors (CMI fdba. TCM)100%100%
- Textron Lycoming100%100%